5th Class Power Engineering Practice Test 2 Flashcards
1
Q
A workplace label:
a) must have a hatched border
b) is always red in colour
c) is almost always required when decanting occurs
d) need show only risk phrases
e) consists of two main parts
A
c) is almost always required when decanting occurs
2
Q
Colour coding in the workplace can be used and colours must be:
a) as per WHMIS colour stipulations
b) as per NFPA colour stipulations
c) any colour as long as they are fully understood by the workers
d) according to CSA stipulations
e) relative to the original container colour
A
a) as per WHMIS colour stipulations
3
Q
An MSDS/MDS consists of a number of basic areas, the number being:
a) 6
b) 5
c) 12
d) 9
e) 7
A
d) 9
4
Q
A controlled product of LD50 of 10 mg/kg when compared to an LD50 of 60 mg/kg is:
a) more lethal
b) more flammable
c) less lethal
d) less flammable
e) less reactive
A
a) more lethal
5
Q
Training programmes must be evaluated:
a) semi-annually
b) annually
c) bi-annually
d) every three years
e) quarterly
A
b) annually
6
Q
The main purpose of the HMIRA is:
a) ensuring facility MSDS are kept up-to-date
b) keeping the CAS current
c) producing items for the IDL
d) protecting manufacturer formulae
e) evaluating controlled product marketing procedures
A
d) protecting manufacturer formulae
7
Q
Which of the following workers are NOT covered by provincial health and safety legislation?
a) school teachers
b) nurses
c) store clerks
d) domestic workers
e) sport athletes
A
d) domestic workers
8
Q
The health and safety regulations are designed to ensure the health and safety of:
a) the employer
b) the employee
c) the occupant
d) the owner
e) everyone
A
e) everyone
9
Q
The health and safety regulations outline the rights and responsibilities of:
a) the owner
b) the occupant
c) the employee only
d) the employer only
e) the employee and the employer
A
e) the employee and the employer
10
Q
When metal is heated to a plastic state and pressure is applied, the type of weld being performed is:
a) forge welding
b) oxy-acetylene welding
c) resistance welding
d) submerged arc welding
e) electric arc welding
A
a) forge welding
11
Q
When a filler rod and very hot flame are used in a welding process, the weld method is:
a) submerged arc welding
b) heli-arc method
c) electric arc method
d) oxy-acetylene method
e) spot-weld method
A
d) oxy-acetylene method
12
Q
An electric arc produced during arc welding, may have a temperature as high as:
a) 3000°C
b) 4250 °C
c) 5325 °C
d) 7450 °C
e) 8300 °C
A
e) 8300 °C
13
Q
A ‘tinning temperature’ is used in:
a) soldering
b) braze welding
c) forging
d) electric arc welding
e) metal cutting
A
b) braze welding
14
Q
A rectifier used in arc welding:
a) will produce temperatures in the range of 700 to 830 degrees C
b) will change AC to DC
c) is used for weld inspection
d) will rectify slag inclusion problems
e) produces an arc in the temperature range of 8300 to 13000 degrees C
A
b) will change AC to DC
15
Q
Which of the following statements about a constant pressure system with Pneumatic Tank is false?
a) water entering directly into the pump suction is discharged into pressurised tank
b) this system is primarily used in larger buildings
c) a system controller automatically starts a standby pump in the event of pump failure
d) the system has a pressure regulator to maintain a relatively
e) air must continuously be introduced into the tank
A
b) this system is primarily used in larger buildings
16
Q
Which of the following statements about Non-Circulating hot water systems is true?
a) the systems have a return line
b) the systems are sued in large residential buildings
c) the systems eliminate hot water stagnation
d) the systems contain a differential fire recoil element
e) the systems force large amounts of water to be wasted before hot water is available in each fixture
A
e) the systems force large amounts of water to be wasted before hot water is available in each fixture
17
Q
Temperature relief devices are effective in eliminating which of the following problems?
a) scale build-up in the system
b) flashing of water into steam when faucets are opened
c) venting off air released from water during heating
d) inadequate heating of the water
e) water stagnation
A
b) flashing of water into steam when faucets are opened
18
Q
The system that has a storage tank above the highest fixture in the system is called:
a) an upfeed system
b) a constant pressure system with suction tank
c) a tankless constant pressure system
d) a downfeed system
e) a direct pressure syste
A
d) a downfeed system
19
Q
The backflow prevention method that consists of two independently acting check valves with an automatic operating pressure differential relief valve located between them is called:
a) air gap backflow prevention
b) double check valve
c) reduced pressure principal device
d) atmosphere vacuum breaker
e) PVB
A
c) reduced pressure principal device
20
Q
Drain traps serve which of the following purposes:
1) to seal the outlet fixture
2) to reduce piping vibration
3) to deflect grease and oil for separate disposal
a) 2) only
b) both 1) and 2)
c) both 1) and 3)
d) 1 only
e) 1), ii) and 3)
A
c) both 1) and 3)
21
Q
Negative pressure in a drainage system may result in which of the following problems:
a) clogging of drain pipes
b) scale of build-up in water closets
c) drawing out of sealing liquids in traps
d) forcing of sewer gases through traps
e) collection of sediment in drain traps
A
c) drawing out of sealing liquids in traps
22
Q
The blow off valve in a storage heater is used to:
a) eliminate pressue build-up in the heater
b) monitor unsafe temperatures
c) release steam should the heater malfunction to avoid flashing of steam in the fixtures
d) remove sediment carried to the heater through the water line
e) shutoff the flow of gas if the flame and pilot light are extinguished
A
d) remove sediment carried to the heater through the water line
23
Q
Which of the following has a trap as in integral part of the fixture?
a) a water closet
b) a sink
c) a storm drain
d) a sewer
e) a sump pump
A
a) a water closet
24
Q
Corrugations in outside aluminium sheet metal conductors is required for which of the following reasons?
a) to increase flow speed of storm water
b) to decrease potential for blockage
c) to eliminate corrosion
d) to allow water flow if there is scale buildup
e) to permit expansion
A
e) to permit expansion
25
Pumps handling cryogenic materials operate:
a) as staged units
b) at extremely low temperatures
c) nearly always as dynamic units
d) as tandem units
e) as high speed units
b) at extremely low temperatures
26
Centrifugal pumps do NOT develop good suction lift because:
a) atmospheric pressure is usually too low
b) the pumped medium relative density is too high
c) their internal component clearances are too high
d) the speed is too low
e) they favour pressure than volume
d) the speed is too low
27
The vertical distance from the liquid surface up to the pump centreline plus the vertical distance from the pump centreline up to the surface of the liquid in the discharge tank is:
a) static discharge head
b) static suction head
c) suction lift
d) total discharge head
e) total static head
e) total static head
28
When a reciprocating pump discharges while its piston or plunger moves in only one direction, it is termed a:
a) positive displacement unit
b) single acting unit
c) dynamic unit
d) double acting unit
e) duplex unit
b) single acting unit
29
Pump wear rings are installed on an impeller by set screws, threading or:
a) shrinking
b) welding
c) brazing
d) soldering
e) forging
a) shrinking
30
If a stuffing box is to prevent the ingress of air, it is equipped with:
a) a vacuum breaker
b) a seal cage
c) a bushing
d) a thrust collar
e) an anti-air syphon
b) a seal cage
31
Flexible couplings will compensate for:
a) overheating of packing
b) axial shaft misalignment
c) bearing failure
d) shaft eccentricity due to a badly bent shaft
e) impeller imbalance
b) axial shaft misalignment
32
Most pump failures and/or damage occurs:
a) after about six months of continuous service
b) due to vapour-binding
c) during initial start-up
d) due to wrong rotation
e) because of inadequate operator training
e) because of inadequate operator training
33
The most frequently used material for piping in buildings is:
a) copper
b) cast iron
c) wrought iron
d) brass
e) steel
e) steel
34
What is the wall thickness of a double extra-strong pipe with an actual outside diameter of 42.16 mm?
a) 9.7 mm
b) 31.75 mm
c) 51.93 mm
d) 61.56 mm
e) 136.25 mm
a) 9.7 mm
35
Screwed connections have threads that conform with ___________ threads.
a) American National Pipe
b) American Standard Pipe
c) American Society Pipe
d) American Mechanical Pipe
e) American Commercial Pipe
a) American National Pipe
36
Which of the following gasket materials are generally used for steam pressure up to 2000 kPa?
a) cork
b) rubber
c) asbestos
d) fibre
e) neoprene
c) asbestos
37
A steam pipe 450 m long is installed at an ambient temperature of 20°C. When in service, the pipe will carry steam at 520°C. If the coefficient of linear expansion of steel is 12.10x10^-6 / °C, how much will the line increase in length when put into service? Please note that 12.10x10^-6 / °C is often (which is in error) written as 12.106 / °C.
a) 0.9 m
b) 1.008 m
c) 2.7 m
d) 2.91 m
e) 3.25 m
c) 2.7 m
38
The main advantage of corrugated expansion joints is that they:
a) require less maintenance
b) require less space
c) can be used up to 5000kPa
d) rarely develop leaks
e) also act as a pipe support
a) require less maintenance
39
Which of the following is NOT a suitable characteristic for piping insulation?
a) safe to use
b) high insulating value
c) a high thermal conductivity (k) value
d) easy to apply
e) vermin proof
c) a high thermal conductivity (k) value
40
Which of the following insulating materials is best used on low temperature applications?
a) asbestos
b) glass fibre
c) magnesium
d) diatomaceous earth
e) plastic foam
d) diatomaceous earth
41
A disadvantage of a ball float steam trap is that it:
a) does not handle air well
b) is greatly effected by changes in steam pressure
c) only operates well under high condensate loads
d) is vulnerable to damage from water hammer
e) must be bypassed on start up
d) is vulnerable to damage from water hammer
42
A disc-type steam trap employs which of the following to control its operations?
a) water level
b) temperature difference
c) heat energy in the steam
d) buoyancy of the disc
e) volatile material in the disc
c) heat energy in the steam
43
In order to reduce the effect of water hammer on pump discharge and suction lines, these lines are often equipped with:
a) corrugated expansion joints
b) strainers
c) bypass valves
d) globe valves
e) air chambers
e) air chambers
44
A valve having minimum wire drawing and seat erosion is the:
a) globe valve
b) gate valve
c) plug valve
d) hand valve
e) wedge gate valve
a) globe valve
45
Increasing the spring tension of a pressure regulating valve will:
a) increase the regulated pressure downstream of the valve
b) close the valve tight
c) decrease the regulated pressure downstream of the valve
d) cause the valve to go to the wide open position
e) reduce or minimize the cycling or 'hunting' of the valve
a) increase the regulated pressure downstream of the valve
46
The maximum temperature that a non-special alloy steel valve can be used for is:
a) 280°C
b) 425 °C
c) 650 °C
d) 1000 °C
e) 1500 °C
c) 650 °C
47
Relative to valves, a frequent cause of serious accidents is due to:
a) valves being of the wrong size
b) a lack of valve maintenance
c) inadequate operational training
d) manufacturing defects
e) wrong materials of construction
e) wrong materials of construction
48
A device used on smaller heating boilers to measure water 'head' or height is the:
a) gage glass
b) header
c) pressure gage
d) syphon
e) altitude gage
e) altitude gage
49
The lowest permissible water level of a power boiler is:
a) 25 mm below the lowest visible water line
b) 50 mm below the lowest visible water line
c) 25 mm above the fireline
d) 50 mm below the fireline
e) 76 mm below the lowest visible water line
b) 50 mm below the lowest visible water line
50
A device that usually uses air or steam to do its job is the:
a) syphon
b) operating control
c) burner
d) sootblower
e) try cock
d) sootblower
51
The maximum energy input to a hot water supply boiler is:
a) 454 L per minute
b) 58.7 kW
c) 20000 BTUH
d) 127 Imperial gallons per minute
e) 587 kW
b) 58.7 kW
52
The combustion chamber of a serpentine tube watertube boiler is:
a) has inefficient heat transfer
b) located above the tube
c) surrounded by the tube
d) located below the tubes
e) enclosed by a non-insulate metal casing
d) located below the tubes
53
What limits the height of a packaged boiler is:
a) building ceiling height
b) internal furnace dimensions
c) firing capacity
d) boiler design
e) transportation requirements
e) transportation requirements
54
"BASIC FITTING FOR STEAM BOILERS DECK"
The purpose of the pipe siphon installed between the boiler and the pressure gauge is to prevent:
```
A) Air from entering the gauge
B) Water from entering the gauge
C) Air from entering the boiler
D) Hot steam from entering the gauge
E) Hot steam from entering the boiler
```
D) Hot steam from entering the gauge
55
LP steam boilers must be equipped with a marker indicating the:
```
A) Maximum water level line
B) Lowest permissible water line
C) Lowest visible water line
D) Low water fuel cut-off line
E) Fireline
```
B) Lowest permissible water line
56
If a gauge glass breaks, the operator shall immediately:
```
A) Add more water to the boiler
B) Shut the boiler down
C) Lift the safety valve
D) Shut off the steam valve and water valve on the gauge
E) Shut the fuel valve
```
D) Shut off the steam valve and water valve on the gauge
57
The try lever test should be done and recorded in the log book:
```
A) Monthly
B) Daily
C) At the beginning of each shift
D) Weekly
E) Annually
```
A) Monthly
58
A disadvantage of a gauge glass safety-shutoff valve is it:
A) Cannot be blown down
B) Requires more maintenance
C) Cannot withstand high pressure
D) Makes gauge glass replacement more difficult
E) Cannot prevent water loss
B) Requires more maintenance
59
What is the first step in replacing a broken gauge glass tube after securing proper PPE?
```
A) Close the gauge glass isolators and open drain
B) Lower boiler level below the glass
C) Isolate the boiler
D) Open the water column drain valve
E) Shut off the feedwater
```
A) Close the gauge glass isolators and open drain
60
The “try lever test” is performed by:
A) Bypassing the high pressure limit control
B) Raising boiler pressure to MAWP
C) Shutting the boiler stop valve
D) Manually lifting the safety valve off of its seat
E) All of the above
D) Manually lifting the safety valve off of its seat
61
Boiler outlet valves are usually:
A) Gate valves because of their low resistance to flow
B) Globe valves because of their low flow resistance
C) Installed in tandem
D) Globe valves because of their throttling capability
E) Gate valves because of the ability to control flow
A) Gate valves because of their low resistance to flow
62
On LP boilers, the try lever test should not be attempted unless the boiler:
```
A) Is at MAWP (maximum allowable working pressure)
B) Is up to temperature
C) Is at least 75% of MAWP
D) The boiler has been blown down
E) Pressure is at least 34 kPa (5 psi)
```
E) Pressure is at least 34 kPa (5 psi)
63
When testing the boiler pressure gauges using a Test Gauge:
A) Any error is compensated for mathematically
B) The boiler must be out of service
C) A single test gauge can be used for all different pressures
D) The gauge should be equipped with a check valve
E) Can be done while the boiler is in service
E) Can be done while the boiler is in service
64
Gauge glass rupture may be caused by:
```
A) A cold draft
B) Maximum allowable boiler pressure
C) Warming the boiler up too quickly
D) Improper boiler water treatment
E) A sudden pressure drop
```
A) A cold draft
65
The force of the steam pressure acting on the safety valve disc is a function of:
```
A) Blowdown ring diameter
B) Seat diameter
C) Huddling chamber volume
D) Percent valve opening
E) Disc area
```
E) Disc area
66
Try cocks are used to:
A) Check the level of water in the boiler
B) Isolate the gauge glass quickly
C) Check the pressure of the water in the column
D) Blow down the water column
E) Check the temperature of the water in the column
A) Check the level of water in the boiler
67
When replacing a gauge glass that uses "O" rings, tighten the packing nuts:
1. Under pressure
2. With a wrench
3. One after another
4. Alternately
A) 3 & 4
B) 2 & 3
C) 1 & 4
D) 2 & 4
E) 1 & 3
D) 2 & 4
68
Some steps involved in performing the “pop” test are:
```
A) Record the pressure at which the valve lifts off of its seat
B) Bypass the high pressure limit switch
C) Close the discharge valve
D) Close the feedwater inlet
E) All of the above
```
E) All of the above
69
A function of a Bourdon tube gauge hairspring is to:
```
A) Keep the pointer at zero
B) Return the tube to its zero position
C) Return the pointer to zero
D) Eliminate backlash
E) Eliminate pointer linearity
```
D) Eliminate backlash
70
When replacing a gauge glass tube after the glass has been isolated and cooled:
```
A) Remove the guard
B) Remove the packing and broken glass
C) Loosen the packing nuts
D) Slowly warm the glass
E) Install the glass
```
A) Remove the guard
71
The blowdown ring on a safety valve is used to adjust:
A) The amount of continuous blowdown as required to control boiler water contaminants
B) The amount of time that the relief valve is open
C) The difference between the pressure at which the valve opens and the pressure at which the valve closes
D) The difference between the temperature at which the valve opens and the temperature at which the valve closes
E) The maximum pressure to open the relief valve
C) The difference between the pressure at which the valve opens and the pressure at which the valve closes
72
"BASIC FITTINGS FOR HOT WATER BOILERS"
The combined pressure temperature relief on a domestic hot water boiler prevents:
A) Energy waste
B) Heated water from becoming steam at atmospheric pressure
C) Reverse flow
D) Heated water from becoming steam at atmospheric pressure
E) The water from being too hot to cause injury
E) The water from being too hot to cause injury
73
Water expansion generated by heating in a boiler system:
A) Lifts the safety valves on the boiler
B) Is absorbed by the flexing of the boiler shell
C) Compresses the air cushion in the expansion tank
D) Is removed by reverse osmosis
E) Goes out the overflow
C) Compresses the air cushion in the expansion tank
74
In a hot water system, if the pressure pointer on a pressure or altitude gauge falls below the altitude pointer, it means that the system:
```
A) Temperature is too low
B) Temperature is too high
C) Has too much water
D) Is not full of water
E) Is over pressured
```
D) Is not full of water
75
A pressure or altitude gage for a hot water boiler:
```
A) Does not require a syphon
B) Shall have a dial scale at least 3 times the MAWP
C) Must be of 51 mm pipe size
D) Must have a temperature dial
E) Must be equipped with a syphon
```
A) Does not require a syphon
76
Before the try lever test on a water system operating above 60°C is attempted, the operator must ensure that:
```
A) The pressure is at least 75% of the valve set pressure
B) The boiler is at maximum pressure
C) The boiler is in operation
D) The boiler inspector has requested it
E) There is no load on the boiler
```
A) The pressure is at least 75% of the valve set
77
Loss of air in the expansion tank is likely caused by an air leak on the:
```
A) Gauge glass fittings
B) Heating valve fittings
C) Inlet fittings
D) Drain plug
E) Boiler safety valves
```
A) Gauge glass fittings
78
A combined temperature pressure relief is used on a:
```
A) High pressure boiler
B) Steam heating boiler
C) Hot water heating boiler
D) High temperature hot water boiler
E) Domestic hot water boiler
```
E) Domestic hot water boiler
79
Hot water boilers have stop valves in their inlet and outlet piping:
A) So that the boiler can be drained without draining the system
B) So that each boiler can have separate water treatment
C) To allow for better warm-ups
D) To permit annual maintenance
E) To prevent water from entering another in service unit
A) So that the boiler can be drained without draining the system
80
The combined pressure and temperature relief device must be installed:
A) Within the top 6 inches of the domestic hot water boiler
B) Within the top 12 inches of the domestic hot water boiler
C) At the center of the domestic hot water boiler
D) Near the bottom of the domestic hot water boiler
E) At the rear of the domestic hot water boiler
A) Within the top 6 inches of the domestic hot water boiler
81
A combined pressure temperature relief valve:
```
A) Operates at 150°C
B) Uses a spring thermostat
C) Operates at 99°C
D) Operates at 75°C
E) Operates at 210°C
```
C) Operates at 99°C
82
In a closed expansion tank system an air separator:
```
A) Is installed at the boiler inlet
B) Removes air from the system
C) Is installed at the boiler outlet
D) Directs air into the expansion tank
E) Is not required
```
D) Directs air into the expansion tank
83
Liquid water:
```
A) Decreases substantially in volume when under pressure
B) Increases in volume when heated
C) Decreases in volume when heated
D) Transmits pressure unevenly
E) Expands substantially under vacuum
```
B) Increases in volume when heated
84
Safety valves lifting on the boiler during operation may be caused by:
```
A) Excess air in the expansion tank
B) Insufficient air in the expansion tank
C) Insufficient make up supply pressure
D) Air in the system
E) Lack of boiler water treatment
```
B) Insufficient air in the expansion tank
85
The correct amount of air in an expansion tank is indicated by a water level in the bottom of the gauge glass of:
A) ⅔ of the gauge glass
B) ⅞ of the gauge glass
C) ¼ of the gauge glass
D) ½ of the gauge glass
D) ½ of the gauge glass
86
The temperature indicator of a hot water boiler should indicate water temperature:
```
A) At the boiler inlet
B) In the boiler
C) At the boiler outlet
D) In the expansion tank
E) Midway through the system
```
C) At the boiler outlet
87
When Changing a gauge glass on an expansion tank:
A) Tighten the packing nuts as hard as possible
B) Check the old glass for nicks and scratches
C) Check the new glass for scratches and nicks
D) These gauge glasses cannot be replaced and a new tank is required
E) Repair and reuse the broken gauge glass
C) Check the new glass for scratches and nicks
88
An auto fill valve used to keep the system filled with water will maintain a typical pressure of:
```
A) 60 psi
B) 15 – 18 kPa
C) 30 psi
D) 20 kPa
E) 15 – 18 psi
```
E) 15 – 18 psi
89
"LOW WATER FUEL CUT OFFS AND FEEDWATER CONTROLS"
A leak in a condensate return pipe can cause:
```
A) Less chemicals to be required
B) A low boiler water condition
C) A decrease in system water use
D) Less corrosion in the condensate system
E) Less fuel to be burned
```
B) A low boiler water condition
90
Equalizing lines on a condensate receiver float chamber:
A) Keep receiver level equal to boiler level
B) Maintain make-up flow equal to condensate flow
C) Eliminate the need for a make-up level control valve
D) Will dampen level fluctuations
E) Maintains equal flow of condensate to multiple boilers
D) Will dampen level fluctuations
91
A hot water boiler low water fuel-cutoff:
A) Must have a normally closed switch
B) Cannot be tested during routine boiler operation
C) Should be located on the expansion tank
D) Should be tested weekly during routine boiler operation
E) Cannot be tested
B) Cannot be tested during routine boiler operation
92
The low water fuel cut-off may be tested by:
A) Decreasing the firing rate
B) Closing the feedwater inlet valve and opening the blowdown valves
C) Opening the gauge glass drain
D) Adjusting the level controller to maximumE) Opening
the feedwater inlet valve and closing the blowdown valves
B) Closing the feedwater inlet valve and opening the blowdown valves
93
Low hot water heating boiler water level can be caused by:
```
A) Feedwater flow exceeding steam flow
B) High boiler conductivity
C) Excessive blowdown (blowoff)
D) Swell in the boiler
E) Low phosphate level
```
C) Excessive blowdown (blowoff)
94
When a boiler equipped with a combination feedwater control and low water cutoff device shuts down due to a low water condition:
A) It can be restarted by simply resetting the low water fuel cut-off switch
B) A prepurge of the boiler before it is restarted will not be necessary
C) The feedwater flow to the condensate receiver tank will also stop
D) Level must be restored to above the cut-off line before the unit can be restarted
E) A manual reset switch on the boiler control panel must be used
D) Level must be restored to above the cut-off line before the unit can be restarted
95
On LP steam heating boilers, the low water fuel cut-off should operate when:
A) The float chamber drain is opened
B) All of the above
C) The boiler water level drops below 25mm (1 in) in the gauge glass
D) There is excessive blowdown or leakage
E) The boiler feedwater flow is stopped during operation
B) All of the above
96
There are many different types of low water fuel cut-off devices used on boilers. The low water fuel cut-off will operate if the:
```
A) Mercury switch is tilted
B) All of the above
C) Float drops down in the float chamber
D) Water uncovers both probes
E) Water level in the boiler is not adequate
```
B) All of the above
97
The low water fuel cut-off must:
```
A) Not be electronically disabled
B) Not be physically disabled
C) Not have isolation valves installed
D) Be repaired immediately on detection of failure
E) All of the above
```
C) Not have isolation valves installed
98
Relief valve discharge due to overfiring a hot water boiler can cause:
```
A) High level in the expansion tank
B) High level of solids in boiler waterHigh level in the expansion tank
C) Low system water temperature
D) Low boiler water level
E) Backflow to city domestic water
```
D) Low boiler water level
99
Feedwater pump failure:
A) Causes the feedwater temperature to rise
B) Causes a low water condition in the boiler
C) Causes the level in the hotwell to drop
D) Increases the load on the deaerator
E) Causes the feedwater supply pressure to increase
B) Causes a low water condition in the boiler
100
The CSA code B51-09, Part1, 6.3.2.2 states that automatically fired hot water boilers not under continuous attendance by a certified operator must be equipped with a low water fuel-cutoff which:
A) Can also activate an alarm
B) Must be a manually reset device
C) May be equipped with isolation valves to isolate it from service
D) Must be a normally open switch
E) Cannot be rendered inoperative or tampered with
E) Cannot be rendered inoperative or tampered with
101
In nearly all LP steam heating systems the feedwater:
```
A) Requires daily close scrutiny of chemical values
B) Requires preheating in an economizer
C) Is usually condensate
D) Is a high make-up percentage
E) Must be deaerated
```
C) Is usually condensate
102
Overheating of boiler heating surfaces due to low water:
A) Can be prevented with proper water treatment
B) Will cause a furnace explosion
C) Cannot occur if the boiler is a hot water unit
D) Is the main cause of boiler failure
E) Can be eliminated with a low water fuel-cutoff
D) Is the main cause of boiler failure
103
The low water fuel cut-off on steam boilers will operate if:
A) The low side connection valve is closed
B) The high side connection valve is closed
C) The drain valve is closed
D) The float chamber drain valve is opened
E) The feedwater regulator fails open
D) The float chamber drain valve is opened
104
A mercury switch in a float operated Low Water Fuel Cut off consists of:
A) float and Rod
B) Electrode and Transformer
C) Glass bulb, electrical contacts, small amount of mercury
D) Motorized valve
E) Diaphragm strainer and bellows assembly
C) Glass bulb, electrical contacts, small amount of mercury
105
During monthly testing of Low Water Fuel Cut off devices, the burner should shut down when the visible level in the gauge glass is approximately:
A) Any time the level is below normal
B) 2 inches below the bottom of the Gauge Glass
C) 2.54 cm (1 inch) above the bottom of the Gauge Glass
D) Half way in the glass
E) 75 mm (3 inches)
C) 2.54 cm (1 inch) above the bottom of the Gauge Glass
106
"HEATING BOILER OPERATION CONTROLS"
A manual “high-low” switch should be switched to “high” or “auto”:
A) When the pressure is too low
B) Prior to ignition of the main flame
C) As soon as the main flame has stabilized
D) When the boiler has been properly warmed up
E) During the boiler pre-purge
D) When the boiler has been properly warmed up
107
A levelling indicator is found on:
```
A) A low water fuel cut-off switch
B) 0A boiler feedwater pump
C) The casing of a heating boiler
D) A modutrol motor
E) An on-off pressure control switch
```
E) An on-off pressure control switch
108
In a hot water heating system, the water temperature must never exceed:
```
A) 110°C
B) 100°C
C) 80°C
D) 60°C
E) 121°C
```
E) 121°C
109
Quickly closing the main burner manual cock valve during boiler operation should check the:
```
A) High gas pressure fuel cut-off
B) Low fire interlock switch
C) Flame Scanner
D) Low gas pressure fuel cut-off
E) Combustion air proving switch
```
A) High gas pressure fuel cut-off
110
Code requirement maximum setting for a high limit control on a steam heating boiler is:
```
A) 68.9 kPa (10 psi)
B) 862 kPa (125 psi)
C) 35 kPa (5 psi)
D) 207 kPa (30 psi)
E) 103 kPa (15 psi)
```
E) 103 kPa (15 psi)
111
Modulating burner controls operate by regulating:
```
A) Fuel temperature and air flow
B) Fuel flow and atomizing steam flow
C) Steam flow and fuel flow
D) Fuel flow and air flow
E) Fuel flow, air flow, and feedwater pressure
```
D) Fuel flow and air flow
112
The high steam pressure fuel cut-off:
1. Requires an isolation valve for maintenance.
2. Is exposed to boiler steam
3. Requires a water seal between it and the boiler
4. Needs to be reset after each operation
```
A) 1, 2
B) 2, 3
C) 1, 2, 3, 4
D) 2, 3, 4
E) 3, 4
```
E) 3, 4
113
A high limit control switch:
A) Must be used when a boiler is not under continuous supervision
B) Activates after the safety valve opens
C) Is a normally open switch
D) Is necessary on all boilers
E) Usually does not require manual resetting
A) Must be used when a boiler is not under continuous supervision
114
The main concern of the boiler operator is to operate a boiler:
A) Without need for water treatment
B) As economically as possible
C) As quietly as possible
D) As safely and as efficiently as possible
E) With the water level as high as possible
D) As safely and as efficiently as possible
115
An on-off steam boiler:
A) Will maintain a fairly constant steam pressure
B) Cannot operate in a multi-boiler system
C) Must have a low capacity
D) Operates most efficiently at continuous firing
E) Will cycle on and off based on a regular timed cycle
D) Operates most efficiently at continuous firing
116
A high gas pressure fuel cut-off switch:
```
A) Is a normally open switch
B) Is never a manual reset device
C) Opens when gas pressure is too high
D) Closes when gas pressure is too high
E) Must be located upstream of an automatic fuel valve
```
C) Opens when gas pressure is too high
117
Ideally, the cut out pressure of the high limit control of a steam heating boiler should not exceed:
```
A) 95% of the safety valve setting
B) 100% of the safety valve setting
C)90% of the safety valve setting
D) 75% of the safety valve setting
E) 80% of the safety valve setting
```
C)90% of the safety valve setting
118
A safeguard is a device or mechanism for ensuring safety. An example of a Safeguard is:
```
A) Low Gas Pressure Fuel Cut-Off Switch
B) Everything listed here
C) High Steam Pressure Fuel Cut-Off
D) Low Air Pressure Fuel Cut-off
E) Low Water Level Fuel Cut off
```
B) Everything listed here
119
Operating controls for hot water boilers are not operated by:
```
A) Liquid expansion
B) Sensing bulb and capillary tube
C) Water temperature changes
D) Steam Pressure
E) Bellows controls
```
D) Steam Pressure
120
Common control switches found on low-pressure heating boilers may include:
```
A) Low and high fire switches
B) Damper positioning switch
C) Auto-manual selector switch
D) All switches described here
E) Flame control switch
```
D) All switches described here
121
"BOILER COMBUSTION CONTROLS "
The programming control relay of a flame safeguard device:
A) Should occasionally have the dust blown out of it
B) Requires an adjustment check monthly by the chief engineer
C) Needs an electrician to work on it
D) Requires yearly maintenance tune up by the operator
E) Can be bypassed
A) Should occasionally have the dust blown out of it
122
The flame scanner lens is:
```
A) Concave
B) Concentric
C) Cleanable
D) Easily changeable
E) Inaccessible
```
C) Cleanable
123
The flame scanner:
A) Is not sensitive to electromagnetic radiation
B) Must be protected from drafts
C) All of the above
D) Should be cool enough to hold in the hand during operation
E) Should be shielded from light
D) Should be cool enough to hold in the hand during operation
124
One type of flame failure device uses a lead sulphide cell that is sensitive to:
```
A) Ultraviolet rays
B) The color of the fuel
C) Infrared rays
D) Radio waves
E) Temperature
```
C) Infrared rays
125
The fuel to a boiler burner should be shut off immediately if it fails to ignite in order to:
```
A) Prevent boiler corrosion
B) Prevent furnace explosions
C) Prevent spills
D) Save fuel
E) Save power
```
B) Prevent furnace explosions
126
A thermocouple:
```
A) Produces an electric signal
B) Senses changes in fuel pressure
C) Senses changes in air pressure
D) Senses infrared light from the flame
E) Consists of two similar wires
```
A) Produces an electric signal
127
The flame scanner sight tube:
A) Should be free of obstructions
B) Should be lubricated often
C) Should be shielded from the burner radiation
D) Is filled with protective packing
E) Should be aimed at the rear of the furnace
A) Should be free of obstructions
128
Flame Rods:
A) Require frequent filing of electrical contacts to prevent corrosion of the device
B) Should shut off the fuel within four seconds of flame failure
C) Are commonly used with oil-fired burners
D) Are rarely used as they are unreliable and require frequent maintenance
E) Should not be exposed to temperatures above 100°C
B) Should shut off the fuel within four seconds of flame failure
129
A flame rod:
A) Is used for gas and oil fired burners
B) Senses the temperature of the flame
C) Is used to light the main burner
D) Forms an electric circuit with the rod, flame and burner
E) Forms an electric circuit with the rod, flame and relay
D) Forms an electric circuit with the rod, flame and burner
130
The Flame Rod Boiler Flame Failure detector is commonly only used with:
```
A) Electric heaters
B) Solid fuels
C) Oil burners
D) Coal burners
E) Gas burners
```
E) Gas burners
131
"BOILER PROGRAMMING CONTROLS"
Which of the following is not a possible cause of the damper motor failing to operate?
A) A loose or jammed linkage
B) High-low fire or modulating control set improperly
C) Loss of fluid in the motor float chamber
D) Motor contacts malfunctioning
E) Positioning switch in wrong position
C) Loss of fluid in the motor float chamber
132
The operating pressure control will control the:
```
A) Steam pressure in the steam header
B) Water pressure to the boiler
C) Boiler furnace pressure
D) Gas pressure to the burner
E) Steam pressure in the boiler
```
E) Steam pressure in the boiler
133
Automatic boiler programming controls may use:
```
A) Interlocking devices
B) High-low fire control
C) All answers shown
D) An ON-OFF or two-position control switch
E) A modulating control system
```
C) All answers shown
134
To meet the programmed control startup conditions, the automatic boiler liquid fuel manual valves should be opened:
A) With the automatic main burner fuel valve
B) After the automatic main burner fuel valve opens
C) Prior to pre-purging
D) Immediately after completion of the pilot flame trial
E) After pre-purge and just prior to pilot ignition
C) Prior to pre-purging
135
When the safety devices and limit controls on boilers, are activated, they shut off the:
```
A) Fuel flow
B) Feedwater flow
C) Steam flow
D) Flue gas flow
E) Combustion air flow
```
A) Fuel flow
136
If pilot ignition has not taken place, the oil fired boiler:
A) Will restart when low airflow switch is closed
B) Will be able to be restarted immediately
C) Will start after reset
D) Does not need to be purged again
E) Will attempt restart after reset and the lock out switch has cooled down
E) Will attempt restart after reset and the lock out switch has cooled down
137
On a gas fired automatic boiler a normal programmed start-up takes approximately:
```
A) 55 seconds
B) 105 seconds
C) 120 seconds
D) 27 - 40 seconds
E) 70 seconds
```
B) 105 seconds
138
Boiler furnaces are purged:
A) So that the programmer has time to verify permissiveness of interlocks
B) So that combustibles are fully removed prior to ignition
C) So that the operator can check the fuel and water systems
D) In order to allow combustion gases to accumulate prior to ignition
E) To allow any hot refractory to completely cool
B) So that combustibles are fully removed prior to ignition
139
In the following start up and shut down sequence for gas fired boilers, which steps are out of order?
1. Starting switch closed. Operating control in cut in position. Master relay energized. Timer starts. Fan starts. Programmer takes control of damper motor. Purge initiated at maximum airflow.
2. Low airflow switch closed.
3. Damper placed in low fire position for purge at reduced flow. Low fire switch must close for ignition to take place.
4. Flame relay switch is open.
5. End of purge period. Ignition energized. Pilot gas valve opens. Start of trial period. When scanner senses pilot flame, the flame relay closes.
6. Main gas valve is energized, main burner lights. Start of main burner ignition.
7. Pilot valve and ignition de-energized. Programmer releases control of damper motor. Damper and fuel valve are now placed in high fire position by the modulating operating control if the boiler is on automatic control, or they are placed on the demand setting of the firing rate selector switch if the boiler is on manual control.
8. End of start cycle, beginning of normal firing period. Timer motor stops, burner and blower remain in operation until heat demand is satisfied and operating controls reach their cut-out points.
9. Operating control opens. Master relay and fuel valve de-energize. Scanner ceases to sense flame. Flame relay opens. Timer restarts. Programmer takes control of modulating motor and holds it in low fire position. Start of after-purge period at low air flow.
10. End of after-purge period. Blower motor stops, timer stops. The system is now ready again for a restart whenever operation control reaches its cut-in point.
```
A) 5 & 6
B) 1 & 2
C) 10 & 5
D) 8 & 9
E) None are out of order
```
E) None are out of order
140
During the startup of an oil fired boiler at the end of the purge the timer:
```
A) Shuts down
B) Energizes the ignition transformer
C) Opens the pilot valve
D) Goes through an ignition trial
E) Opens the fuel valve
```
B) Energizes the ignition transformer
141
For programmed startup of boilers with Natural Draft the electrical circuit to the main gas valve is closed:
```
A) When the flame detector senses the Pilot flame
B) When the water level is high
C) Before purging
D) While purging
E) During pilot ignition
```
A) When the flame detector senses the Pilot flame
142
Which of the following is not required before starting using programming control?
```
A) Main power on
B) Water level above cutoff
C) Water temp below cut in
D) Gas pressure above low pressure cutoff
E) Main gas valve closed
```
E) Main gas valve closed
143
"BASIC BOILER OPERATION"
Housekeeping:
```
A) Is necessary to be done monthly
B) Is not important
C) Is not the responsibility of the operator
D) Does not affect operation
E) Is a means of preventing accidents
```
E) Is a means of preventing accidents
144
A good indication of the effectiveness of heat transfer from the fireside to the waterside of a boiler is:
```
A) Firing rate
B) Stack temperature
C) Boiler water pH
D) Flue gas analysis
E) Fuel and air flow rates
```
B) Stack temperature
145
Our senses are useful for:
```
A) Perceiving changes in the environment
B) Interpreting engineering documents
C) Understanding instructions
D) Decoding radio waves
E) Deciding intentions of co-workers
```
A) Perceiving changes in the environment
146
A furnace explosion in a boiler may be caused by:
```
A) Sludge and scale build up
B) Thermal shock
C) Corrosion
D) A weak pilot flame
E) Overheating due to low water
```
D) A weak pilot flame
147
If severe foaming occurs in a steam boiler, the foaming may be controlled by:
A) Lowering the water level by 5 cm and then refilling to normal level
B) Antioxidants
C) Placing an oil filter in the supply water line
D) A series of quick boiler blow offs
E) Water tests
A) Lowering the water level by 5 cm and then refilling to normal level
148
If the safety relief valve on a hot water boiler is set at 880 kPa, then the operating pressure of the boiler should not exceed:
```
A) 680 kPa
B) 620 kPa
C) 600 kPa
D) 660 kPa
E) 640 kPa
```
D) 660 kPa
149
When shutting down a steam boiler the vent should be opened at above atmospheric pressure to:
```
A) Facilitate draining the boiler
B) Prevent water hammer
C) Facilitate the removal of air
D) Prevent the formation of a vacuum in the boiler
E) Prevent the boiler from priming
```
D) Prevent the formation of a vacuum in the boiler
150
To open the boiler for inspection:
1. Open stop valves in the supply and return lines
2. After the boiler has cooled down open the blow off and vent valves
3. Isolate the boiler from any common expansion tank
4. Add chemicals to the boiler
5. After the boiler is drained, remove manhole and handhole covers and drain plugs
6. Wash the boiler out with a stream of high pressure cold water
```
A) 1, 3, 4, then 6
B) 2, 5, 3, then 6
C) 1, 3, 5, then 6
D) 3, 2, 5, then 6
E) 1, 3, 4, then 6
```
D) 3, 2, 5, then 6
151
Thermal shock to boilers can be reduced by:
A) Not allowing full flow of cold water into a warm boiler
B) Keeping the boiler free of scale build-up
C) Covering the tubesheets with refractory
D) Warming up boilers slowly
E) All of the above
E) All of the above
152
Before starting up a new boiler or one that has been out of service the following must be ensured:
A) The manufacturer's recommendations are read
B) The boiler is cold
C) The boiler control is in the off position
D) The fuel is shut off
E) The boiler has a valid inspection certificate
E) The boiler has a valid inspection certificate
153
The discharge pressure of the safety valves on a low pressure steam boiler should not exceed:
```
A) 153 kPa
B) 14.7 kPa
C) 121 kPa
D) 35 kPa
E) 103 kPa
```
E) 103 kPa
154
The most important rule in the safe operation of a steam boiler is:
A) Keep the water level in the boiler at the proper level
B) Maintain the correct pressure on the altitude gage
C) Ensure air is kept out of the system
D) Maintain the proper operation of automatic controls
E) Operate the boiler properly
A) Keep the water level in the boiler at the proper level
155
Finding the source of a change in the plant environment leads to:
```
A) Panic
B) Shutting down the affected equipment
C) Bypassing affected systems
D) Analyzing the situation and determining action
E) Reacting to the situation
```
D) Analyzing the situation and determining action
156
It is very important that boilers should be warmed up:
A) Quickly, to prevent condensation
B) Quickly, to prevent scale build-up
C) Slowly, to prevent thermal shock
D) At a rate of one degree every five minutes
E) Slowly, so the operator can check the drain system
C) Slowly, to prevent thermal shock
157
When cutting in an additional boiler into a hot water heating system, during the warm up the supply:
A) And return stop valves should be closed
B) Valve is open slightly and the return valve is closed
C) And return stop valves should be fully open
D) Valve should be closed and the return valve should be open
E) And return stop valve should both be open slightly
A) And return stop valves should be closed
158
If the water level in a boiler is found to be below the gauge glass, the appropriate action is to:
```
A) Shut the boiler down immediately
B) Call the boiler inspector
C) Call maintenance
D) Leave the area
E) Call the chief engineer
```
A) Shut the boiler down immediately
159
A high water level in a steam boiler:
A) Is usually the result of a boiler feedwater pump malfunction
B) Will necessitate an immediate shutdown, cool down and inspection of the boiler
C) Will not be made worse by dropping the boiler pressure allowing swell to occur
D) Is usually the result of a water level control malfunction
E) Should cause a high water level switch to shutdown the boiler burner
D) Is usually the result of a water level control malfunction
160
When starting an oil fired boiler, the stack may smoke slightly. This may be due to:
```
A) Outside air temperature too cold
B) Too much excess air
C) Furnace temperature too cold
D) Oil supply temperature too cold
E) Too much atomizing air on the burner
```
C) Furnace temperature too cold
161
A pressure explosion in a boiler occurs when:
```
A) Methane gas explodes
B) CO accumulates and ignites
C) The air fuel mixture detonates
D) Pressure parts fail
E) The furnace is inadequately purged
```
B) CO accumulates and ignites
162
After analyzing the situation that a change in the plant environment has given rise to:
A) There is often nothing that can be done to correct the situation
B) The appropriate action is performed
C) The change is then sensed subconsciously
D) The evacuation of the plant is initiated
E) A plant operator must interpret the change
B) The appropriate action is performed
163
A boiler log:
```
A) Can be disposed of when full
B) Is a valuable operating tool
C) Is useful only to the office
D) Can be filled out anytime
E) Is not important
```
B) Is a valuable operating tool
164
When starting up a steam boiler, the boiler air vent valve should be closed at:
```
A) 0 - 5 kPa
B) 5 - 10 kPa
C) 15 - 20 kPa
D) 10 - 15 kPa
E) 20 - 25 kPa
```
C) 15 - 20 kPa
165
When there is a change in the plant environment:
```
A) Something is failing
B) It should be ignored
C) It represents danger
D) It is usually insignificant
E) The change needs to be interpreted
```
E) The change needs to be interpreted
166
Interpretation of a change in plant environment leads to:
```
A) Action
B) Ordering the correct parts
C) Resolution
D) Realization of the source of the change
E) A conclusion
```
D) Realization of the source of the change
167
Before shutting down a hot water boiler:
```
A) Open the bottom blow-off until the water is clear
B) Test the safety valves
C) Drain the expansion tank
D) Drain the system
E) Test the LWCO’s
```
A) Open the bottom blow-off until the water is clear
168
Which of the following is a boiler check done by the operator on a monthly basis?
A) Recording the temperature and pressure at the boiler outlet
B) Checking the condition of the flame in the furnace
C) Checking the water level
D) Safety Valve Pop Test
E) Water quality
D) Safety Valve Pop Test
169
"ROUTINE BOILER MAINTENANCE AND INSPECTIONS"
Before welders are allowed to weld on a boiler they must have a:
A) Performance qualification card
B) Certificate of qualification
C) Welding test conducted
D) Certificate of qualification and a performance qualification card
E) Certain minimum number of years experience
D) Certificate of qualification and a performance qualification card
170
If there is a possibility of freezing, the best method for layup is the:
```
A) CO2 method
B) Glycol method
C) Wet method
D) Dry method
E) Nitrogen cap method
```
D) Dry method
171
The wet method of boiler storage requires the boiler to be:
```
A) Scale free
B) Filled with distilled water
C) Completely filled with water to exclude air
D) Boiled out
E) Chemically cleaned
```
C) Completely filled with water to exclude air
172
Leaks in steam, water and fuel connections:
```
A) Can be ignored until the next shut down
B) Are not an operation issue
C) Only need to be contained
D) Are not important
E) Can cause damage due to wire drawing
```
E) Can cause damage due to wire drawing
173
The purpose of an alkaline boil out of a boiler is to:
```
A) Remove bicarbonate scale
B) Remove silica scale
C) Neutralize ash deposits
D) Neutralize acidic materials
E) Remove grease, oil or other contaminants
```
E) Remove grease, oil or other contaminants
174
A hydrostatic test consists of filling the boiler:
A) Completely full and pressurizing it with air
B) To operating level and pressurizing it with a pump
C) Operating level and pressurizing it with nitrogen
D) Completely full of water and pressurizing it with a pump
E) ½ full and pressurizing it with air
D) Completely full of water and pressurizing it with a pump
175
One of the legal responsibilities of the engineer during an inspection is:
A) To notify the Worker’s Compensation Board of the inspection
B) To be in possession of an inspection certificate
C) To allow the inspector onto the premises, but only during normal working hours
D) To have at least two staff members present at all times
E) Point out any known or suspected defects to the inspector
C) To allow the inspector onto the premises, but only during normal working hours
176
A failed firetube may be detected by:
A) Water dripping from front or rear boiler door seals
B) Water vapour coming from the flue gas outlet
C) A hissing sound at the rear of the boiler
D) All of the above
E) Water visible through the rear sight glass
D) All of the above
177
The black light method of crack detection uses fluorescent:
```
A) Cameras
B) Isotopes
C) Paint
D) Lights
E) Penetrant
```
E) Penetrant
178
A hydrostatic test is carried out at:
```
A) 2 times the MAWP
B) MAWP (Maximum Allowable Working Pressure) of the boiler
C) 3 times the MAWP
D) ½ times the MAWP
E) 1 ½ times the MAWP
```
E) 1 ½ times the MAWP
179
A very important job during an internal inspection in regard to safety is:
A) Looking for evidence of damage
B) Producing a tagging system to account for valves, circuit breakers and other devices operated or removed from service to ensure the safety of the job
C) Servicing combustion equipment
D) Looking for evidence of scale
E) Ensuring that all equipment is in good operating condition
B) Producing a tagging system to account for valves, circuit breakers and other devices operated or removed from service to ensure the safety of the job
180
The most common acid for boiler cleaning is:
```
A) Hydrochloric
B) Nitric
C) Chelate
D) Sulphuric
E) Phosphoric
```
A) Hydrochloric
181
A tagged valve, damper circuit breaker or other device shall not be operated until the tag is:
A) Authorized to be removed by telephone or radio
B) Removed by the chief engineer
C) Removed by the owner
D) Authorized to be removed by the plant manager
E) Removed by the person directly in charge of the job
E) Removed by the person directly in charge of the job
182
During a hydrostatic test:
A) Safety valves must be removed and blanked off
B) All of the above
C) Air must be completely removed from the boiler
D) Water temperature should be at ambient temperature
E) All instruments and fittings not rated for 1 ½ times MAWP must be removed or isolated
B) All of the above
183
A boiler inspection:
A) Is done with the owner’s permission only
B) Must be done when the boiler inspector requests it
C) Must be done every two years
D) Must be done after every shut down of the boiler
E) Must be done before the boiler is ready for start up
B) Must be done when the boiler inspector requests it
184
If a cast iron heating boiler is removed from seasonal service and the soot and ashes are not removed as soon as possible the result may be the:
```
A) Spontaneous combustion of the soot
B) Corrosion of the metal surfaces
C) Formation of toxic fumes
D) Fireside will be inaccessible for inspection
E) Crystallization of the ash
```
B) Corrosion of the metal surfaces
185
Portable lamps used during the internal inspection of a boiler must be:
```
A) Greater than 120 V
B) 100 W
C) 12 V or less
D) 24 mV
E) 347 V
```
C) 12 V or less
186
The dry method of boiler storage uses slaked lime, activated alumina, or silica gel to:
```
A) Control the pH of the boiler water
B) Adsorb chemical odours in the boiler
C) Adsorb oxygen from the air
D) Prevent vermin from entering the setting
E) Adsorb moisture from the air
```
E) Adsorb moisture from the air
187
When removing a boiler for service, the topmost manhole covers should be removed first to:
A) Aid in the draining process
B) Get the process done while the boiler is draining
C) Prevent steam burns caused by the circulating effect
D) Allow for gasket replacement
E) Prevent air damaging waterside surfaces
C) Prevent steam burns caused by the circulating effect
188
A steam heating boiler that is to be shutdown for a considerable length of time should be:
A) Left with the water at normal working level but opened up to atmosphere
B) Filled completely with water and the vent left open to atmosphere
C) Drained, thoroughly dried out, lime placed inside and closed up
D) Left with the water at normal working level and pressurised with air to 50 kPa
E) Drained, thoroughly dried out, lime placed inside and left open
C) Drained, thoroughly dried out, lime placed inside and closed up
189
An inhibitor, when added to acid will:
A) Cause foaming in the boiler
B) Minimize the effect the acid has on the metal
C) Prevent the acid from attacking the boiler metal
D) Make the acid compatible with the sewer system for disposal
E) Strengthen the acid thereby shortening the cleaning procedure
B) Minimize the effect the acid has on the metal
190
A relatively new and safer chemical used in boiler cleaning is:
```
A) Chelate
B) Sodium hydroxide
C) Hydrazine
D) Caustic soda
E) Trisodium phosphate
```
A) Chelate
191
Causes of firetube failure are:
```
A) All of the above
B) Poor water circulation
C) Excessive firing rate/ thermal shock
D) Heavy scale
E) Corrosion
```
A) All of the above
192
A boiler circulating pump gland should have some leakage:
A) So the operator can tell when the pump becomes vapour bound
B) So that the shaft sleeve will take the wear
C) In order for the stuffing box to run at the desired high temperature
D) In order to keep the motor amperage down
E) To prevent the packing from drying out
E) To prevent the packing from drying out
193
When washing the boiler out, it is essential to ensure that:
```
A) Handhole gaskets have been replaced
B) Safety valves are removed
C) The water column is blanked off
D) No blow back into the boiler from the blowdown system can occur
E) Low water cut offs are removed
```
D) No blow back into the boiler from the blowdown system can occur
194
COMBUSTION AND DRAFT
Insufficient air for combustion will result in:
1. Sulfur monoxide in the flue gases
2. High oxygen reading in flue gases
3. Lower than normal oxygen reading in flue gases
4. High CO in flue gases
5. Higher than normal flue gas temperature
A) 1, 2, 3
B) 1, 3, 5
C) 3, 4, 5
D) 1, 3, 4
E) 2, 3, 4
D) 1, 3, 4
195
Combustion of a fuel in a boiler furnace:
A) Should be performed with a minimum of excess air
B) Is perfect if there is no moisture in the stack gases
C) Requires a higher air-fuel ratio than a diesel engine
D) Requires a higher air-fuel ratio than a gas turbine
E) Requires mechanical draft
A) Should be performed with a minimum of excess air
196
Proper draft is important to the plant operator because it:
A) Satisfies the codes
B) Delivers the products of combustion to a high altitude
C) Prevents toxic gases from leaking out of the system
D) Produces efficient combustion
E) Reduces the volume of ash or slag
D) Produces efficient combustion
197
In a forced draft system, the furnace pressure is:
```
A) Below atmospheric pressure
B) Measured in psi
C) Above atmospheric pressure
D) At atmospheric pressure
E) Not a factor
```
C) Above atmospheric pressure
198
A pressurized furnace is usually associated with:
```
A) Packaged boiler with forced draft
B) Natural draft
C) Balanced draft
D) Large steam generators
E) Induced draft
```
A) Packaged boiler with forced draft
199
The combustible elements in fuels are:
1. Carbon
2. Sulphur
3. Ash
4. Nitrogen
5. Hydrogen
```
A) 1, 2, 5
B) 2, 3, 5
C) 1, 4, 5
D) 1, 2, 3
E) 3, 4, 5
```
E) 3, 4, 5
| Ash,Nitrogen,Hydrogen
200
Inlet damper control on a fan:
A) Is used on forced draft fans only
B) Is less complicated than an outlet damper control
C) Can only be used when the fan is driven by a steam turbine
D) Regulates the amount of air entering the fan
E) Requires more power to drive the fan when the vanes are closed
D) Regulates the amount of air entering the fan
201
An induced draft fan:
A) Is physically smaller than a FD (forced draft) fan
B) Operates at much higher temperatures than an FD fan
C) Handles only air
D) Has less expensive materials of construction than an FD fan
E) Discharges air to the windbox
B) Operates at much higher temperatures than an FD fan
202
A continuous flow of air and gas through a boiler is produced by a:
```
A) Flow difference
B) Specific gravity difference
C) Velocity difference
D) Pressure difference
E) Viscosity difference
D) Pressure difference
```
D) Pressure difference
203
The refining process for fuel oils involves separating the crude oil into end products, which have distinguishing characteristics such as specific gravity, viscosity, and:
```
A) Odour
B) Solids content
C) Boiling point
D) Colour
E) Heating value
```
C) Boiling point
204
Combustion air openings are required by code. Combustion air can be said to be:
A) Atomising air
B) All air which contributes to the completion of combustion
C) Excess air
D) All air which enters the boiler furnace including high excess air
E) All air which contacts the raw fuel before the burner
B) All "air which contributes" to the completion of combustion
205
What are the advantages of mechanical draft?
1. Dependent on atmospheric air temperature
2. Independent of the chimney temperature
3. A smaller chimney can be used
4. More definite draft control is possible
```
A) 1, 3, 4
B) 1, 2, 3, 4
C) 3, 4
D) 1, 2, 3
E) 2, 3, 4
```
E) 2, 3, 4
| independent,smaller,definite
206
The draft through a natural draft furnace is increased by:
A) Decreasing the height of the stack
B) Reducing the firing rate
C) Increasing the temperature of the stack
D) Warming the outside air
E) Decreasing the furnace temperature
C) Increasing the temperature of the stack
207
Carbon monoxide is both combustible and:
```
A) Expensive
B) Grey in colour
C) Inert
D) Non-compressible
E) Undesirable
```
E) Undesirable
208
CO₂ is the chemical symbol for:
```
A) Carbon monoxide
B) Carbon
C) Carbonic acid
D) Hydrocarbon
E) Carbon dioxide
```
E) Carbon dioxide
209
A boiler with only an induced draft fan:
```
A) Will have a positive furnace pressure
B) Cannot maintain a stable fire
C) Will have a negative furnace pressure
D) Does need an airtight furnace
E) Needs a long stack
```
C) Will have a negative furnace pressure
210
Carbon, which is "not combined with hydrogen", is referred to as:
```
A) Loose carbon
B) Non-united carbon
C) Mono-carbon
D) Fixed carbon
E) Separate carbon
```
D) Fixed carbon
211
The main disadvantage of oil in comparison to coal is that it:
```
A) Does not burn as cleanly
B) Requires more storage space
C) Is more expensive
D) Is harder to control its flow to the furnace
E) Requires more handling equipment
```
C) Is more expensive
212
Boiler combustion is regulated by:
A) Varying the speed of an ID fan
B) Controlling or regulating the fuel flow
C) Controlling or regulating the air flow
D) Varying the speed of an FD fan
E) Controlling the air and fuel flow
E) Controlling the air and fuel flow
213
Soot can be caused by:
```
A) Too much nitrogen in the air
B) High temperature combustion air
C) Insufficient combustion air
D) Too much combustion air
E) Too high a boiler pressure
```
C) Insufficient combustion air
214
The main components of natural gas supplied to the consumer are:
```
A) Ethane and butane
B) Methane and carbon
C) Methane and ethane
D) Methane and propane
E) Propane and butane
```
C) Methane and ethane
215
If a "U" tube is connected to the discharge of a forced draft fan the:
A) Open end will have a higher liquid level than the connection to the fan
B) Liquid level will be the same in both sides of the "U" tube
C) Liquid will be drawn into the forced draft stream
D) Connection to the fan will have a higher liquid level than the open end
E) Liquid will expand
A) Open end will have a higher liquid level than the connection to the fan
216
The amount of air required to supply just enough oxygen for complete combustion is called the:
```
A) Primary air
B) Secondary air
C) Exact air
D) Theoretical air
E) Perfect air
```
D) Theoretical air
217
```
Which of the following advantages does oil have over coal as a boiler fuel?
1. Requires less storage space
2. Requires less handling equipment
3. Burns more cleanly
4. More abundant than coal
A) 3, 4
B) 2, 3, 4
C) 1, 3, 4
D) 1, 2, 4
E) 1, 2, 3
```
E) 1, 2, 3
218
Natural draft is produced in a boiler furnace when:
A) Gases are heated; they tend to contract so that each cubic metre has more mass
B) Hot flue gases are condensed
C) Gases in the stack have less mass than an equal column of outside colder air
D) The dampers are fully closed
E) Gases in the stack have more mass than an equal column of outside colder air
C) "Gases in the stack" have less mass than an equal column of outside colder air
219
Furnace explosions may be caused by:
```
A) Failure of boiler safety valve
B) High steam pressure
C) Scale and sludge buildup
D) Insufficient purge
E) Overheating of surfaces due to low water level
```
D) Insufficient purge
