Book 12

Question 1

Which of these is NOT used for burning coal?
Select one:

a.
Under feed stoker

b.
Rotary cup stoker

c.
Cross feed stoker

d.
Chain grate stoker

Answer 1

Rotary cup stoker

Question 2

A solenoid type fuel valve;
Select one:

a.
Is held closed by fuel gas pressure

b.
Always opens rapidly

c.
Is held closed by electrical current

d.
Closes slowly

Answer 2

Is held closed by fuel gas pressure

Question 3

A characteristic of mechanical draft is that the draft:
Select one:

a.
Varies with atmospheric pressure

b.
Varies with chimney height

c.
Varies with chimney temperature

d.
Is properly regulated during all firing conditions

Answer 3

Is properly regulated during all firing conditions

Question 4

A two element feed water control system compensates for:
Select one:

a.
Level variation

b.
Differential steam flow rate

c.
Feed water temperature variation

d.
Shrink and swell

Answer 4

Shrink and swell

Question 5

The power requirements for the FD fan of a fluidized bed boiler are ______ times _______ than other boiler designs?
Select one:

a.
1.5, more

b.
3, more

c.
4, more

d.
1.5, less

Answer 5

3, more

Question 6

The balanced equation for the incomplete combustion of carbon is:
Select one:

a.
C + O2 = CO2 + heat

b.
2C + O2 = CO + heat

c.
C + 2O2 = 2CO + heat

d.
2C + O2 = 2CO + heat

Answer 6

2C + O2 = 2CO + heat

Question 7

A blowoff tank:
Select one:

a.
Is not classed as a pressure vessel since it is vented

b.
Lowers the temperature and pressure of the incoming boiler water

c.
Must have a safety valve, set to the maximum allowable working pressure of the tank

d.
Accommodates only one boiler
Feedback

Answer 7

Lowers the temperature and pressure of the incoming boiler water

Question 8

Low fuel pressure in an constant capacity mechanical atomizing oil burner produces:
Select one:

a.
Low excess air requirements

b.
A short blue flame

c.
Gummy deposits in the burner nozzle

d.
Poor atomization

Answer 8

Poor atomization

Question 9

In a mechanical atomizing burner with three fixed capacity burners, the Intermediate and high fire burner nozzles may have higher capacities than the primary burner nozzle:
Select one:

a.
To give greater firing variations

b.
To prevent pressure surges

c.
Because of the pump being of the positive displacement type

d.
To allow slower boiler warm-ups

Answer 9

To allow slower boiler warm-ups

Question 10

The main function of a gas burner is:
Select one:

a.
Atomization of the fuel

b.
A source of ignition

c.
Mix the fuel and air

d.
Regulation of the fuel flow

Answer 10

Mix the fuel and air

Question 11

One way to increase natural draft is to:
Select one:

a.
Incorporate a forced draft fan

b.
Increase the primary air flow

c.
Install a higher chimney

d.
Decrease the amount of excess air

Answer 11

Install a higher chimney

Question 12

Which of the following is NOT necessary for complete combustion of a fuel?
Select one:

a.
The temperature of the furnace must be high enough

b.
The combustion air must be preheated

c.
Enough time must be allowed for the fuel to burn

d.
The air and fuel must mix thoroughly

Answer 12

The combustion air must be preheated

Question 13

Solid biofuels can come from a range of sources, except for which of the following?

a.
Wood processing waste

b.
Vegetable waste from food processing industries

c.
Municipal wastes

d.
Ferrous waste from pulp and paper operations

Answer 13

Ferrous waste from pulp and paper operations

Question 14

The amount of air required to supply just enough oxygen for complete combustion is called the:
Select one:

a.
Excess air

b.
Perfect air

c.
Primary air

d.
Theoretical air

Answer 14

Theoretical air

Question 15

Which of these groups is the combustible components of coal?
Select one:

a.
Nitrogen, oxygen, ash

b.
Carbon, hydrogen, sulphur

c.
Carbon dioxide, nitrogen, sulphur dioxide

d.
Carbon, ash, nitrogen
Feedback

Answer 15

Carbon, hydrogen, sulphur

Question 16

The advantage of a steel stack over a reinforced concrete stack is that a steel stack:
Select one:

a.
Is more durable

b.
Requires less maintenance

c.
Has lower cost

d.
Has longer life

Answer 16

Has lower cost

Question 17

Fluidized bed boilers can successfully burn coal with ash contents as high as
Select one:

a.
30%

b.
55%

c.
60%

d.
70%

Answer 17

70%

Question 18

Combustion of fuel in a boiler furnace:
Select one:

a.
Requires a higher air-fuel ratio than a diesel engine

b.
Should occur with a minimum of excess air

c.
Is perfect when the stack gases are free of moisture

d.
Requires mechanical draft
Feedback

Answer 18

Should occur with a minimum of excess air

Question 19

Which of the following is NOT a type of oil burner?
Select one:

a.
Atmospheric burners

b.
Steam atomizing burners

c.
Mechanical or pressure atomizing burners

d.
Centrifugal or rotary cup burners

Answer 19

Atmospheric burners

Question 20

Efficient combustion is achieved by controlling the:
Select one:

a.
Fuel-air ratio

b.
Net stack temperature

c.
Steam-fuel ratio

d.
Firing rate

Answer 20

Fuel-air ratio

Question 21

A diaphragm type pressure gauge:
Select one:

a.
Is used to measure high pressures

b.
Operates on a mercury column

c.
Cannot be used for pressures greater than atmospheric

d.
Is used to measure very small pressures

Answer 21

Is used to measure very small pressures

Question 22

When a modulating mechanical atomization system is used with an oil burner:
Select one:

a.
Air pressure at the burner should be 70 kPa

b.
Dry saturated steam should be used

c.
Very high pump pressure is required for correct atomization

d.
The fuel must be preheated to 90 degrees C

Answer 22

Very high pump pressure is required for correct atomization

Question 23

Water that leaves a blowoff tank and enters a sewer must not exceed _______ °C:
Select one:

a.
45

b.
50

c.
75

d.
65

Answer 23

65

Question 24

With a fluid-fired burner, primary and secondary air are swirled in which directions, respectively?

a.
Counter clockwise and clockwise

b.
Clockwise and clockwise

c.
Clockwise and counter clockwise

d.
Counter clockwise and counter clockwise

Answer 24

Clockwise and counter clockwise

Question 25

Blowoff valves are used to: Select one: a. Drain or remove sediment from the bottom of the steam drum b. Drain or remove sediment from the bottom of the boiler c. Drain or remove sediment from the continuous blowdown d. Reduce the steam pressure on the boiler

Answer 25

Drain or remove sediment from the bottom of the boiler

Question 26

Which is NOT a fireside surface cleaning method? a. Rapping b. Acoustic cleaning c. Soot blowers d. Slagging

Answer 26

Slagging

Question 27

Retractable soot blowers are installed in a boiler's radiant heat transfer area including the. Select one: a. Economizer b. Secondary air heater c. Air preheater d. Reheater

Answer 27

Reheater

Question 28

A condensate receiver low level cutoff switch will: Select one: a. Open a make-up solenoid b. Stop the feed pump thereby preventing damage to it c. Shut off the boiler d. Cause the make-up valve to close Feedback

Answer 28

Stop the feed pump thereby preventing damage to it

Question 29

Which of these is NOT one of the undesirable characteristic of flue-gas carbon monoxide? Select one: a. CO pockets in the furnace can be explosive b. High flue gas CO means the combustion is inefficient c. Less heat of combustion is being released by the fuel d. CO causes fireside corrosion Feedback

Answer 29

CO causes fireside corrosion

Question 30

This type of boiler condensate return piping arrangement prevents the boiler pressure from forcing boiler water into the return lines: Select one: a. Return line piping b. Pipe siphon c. Back-flow preventer d. Hartford loop

Answer 30

Hartford loop

Question 31

With regards to chimneys, the flow of combustion air depends on which three things? a. The height of the chimney, pressure of the flue gas, and temperature of the cool air column b. The height of the chimney, temperature of the flue gas, and temperature of the cool air column c. The height of the chimney, pressure of the flue gas, and pressure of the cool air column d. The height of the chimney, temperature of the flue gas, and pressure of the cool air column Feedback

Answer 31

The height of the chimney, temperature of the flue gas, and temperature of the cool air column

Question 32

One advantage of oil over coal as a fuel is that oil: Select one: a. Burns cleaner b. Is more abundant c. Is less expensive d. Has more fixed carbon

Answer 32

Burns cleaner

Question 33

The boiler blowoff valves are opened and closed in a specific sequence to: Select one: a. Carry out the blowdown accurately b. Prevent excessive water discharge c. Maintain the boiler water level d. Protect the valve closest to the boiler

Answer 33

Protect the valve closest to the boiler

Question 34

The amount of pre-mix air to an atmospheric burner is typically: Select one: a. 10% to 12% b. 5% to 8% c. 20% to 50% d. 30% to 40%

Answer 34

30% to 40%

Question 35

The approximate amount of excess air for combustion of a gaseous fuel is: Select one: a. 6 - 8% b. 3 - 5% c. 10 - 15% d. 3 - 10%

Answer 35

3 - 10%

Question 36

A long retractable soot blower: Select one: a. Has nozzles throughout its full length b. Is used to clean furnace walls c. Rotates and blows while extending and retracting d. Blows only when fully extended

Answer 36

Rotates and blows while extending and retracting

Question 37

In underfeed stokers, underfire air passes through what kind of openings in the grate? a. Tweerz b. Channel c. Retort d. Tuyere

Answer 37

Tuyere

Question 38

A steam boiler must be equipped with two low water fuel cut-off devices when the boiler: Select one: a. Has over 47 m² of heating surface b. Has dual fuels c. Is not continuously attended d. Has two burners

Answer 38

Is not continuously attended

Question 39

Inlet damper control on a fan: Select one: a. Requires more power to drive the fan when the vanes are closed. b. Requires less power to drive the fan at reduced loads. c. Is only used on forced draft fans. d. Is far less complicated than outlet damper control. Feedback

Answer 39

Requires less power to drive the fan at reduced loads.

Question 40

What is the general equation for the combustion process? a. Fuel + oxygen yields products of combustion + energy b. Endothermic energy + fuel + oxygen yields products of combustion c. Fuel + oxygen yields products of combustion + enthalpy d. Fuel + oxygen yields products of combustion + exothermic energy

Answer 40

Fuel + oxygen yields products of combustion + energy

Question 41

Which of the following substances is commonly found in fuel, but is non-combustible? Select one: a. CO b. H2 c. C d. H2O Feedback

Answer 41

H2O

Question 42

The area of a boiler in which air and fuel combine in a chain reaction to cause sustained burning is the: Select one: a. Baffle b. Combustion chamber c. Drum d. Breeching

Answer 42

Combustion chamber

Question 43

Natural draft is produced in a boiler furnace when: Select one: a. Hot flue gases contract so that each cubic meter has more mass b. Gases in the stack have less mass than an equal column of outside air c. Gases in the stack have more mass than an equal column of outside air d. Hot flue gases condense

Answer 43

Gases in the stack have less mass than an equal column of outside air

Question 44

Which wood-like fuels are sourced from grasses and straw, sometimes in the form of chips, hogs, pellets, or bales? a. Urban wood fuels b. Herbaceous fuels c. Wood pellets d. Wood chips

Answer 44

Herbaceous fuels

Question 45

Which of the following burner designs is NOT used for burning oil? Select one: a. Mechanical atomizing burner b. Air atomizing burner c. Steam atomizing burner d. Stoker-type burner

Answer 45

Stoker-type burner

Question 46

Large capacity burners: Select one: a. Require high flow on ignition b. Are very safe relative to puff-back c. Require only a small pilot flame d. must not have full flow of fuel on startup

Answer 46

must not have full flow of fuel on startup

Question 47

On a boiler blowoff system, a valve that requires at least five 360° turns of the operating mechanism to change from fully open to fully closed is known as: Select one: a. A quick opening valve b. A non-return valve c. A slow opening valve d. An isolating valve

Answer 47

A slow opening valve

Question 48

What do natural draft systems that rely on the hot gases in the chimney have? a. Less specific gravity than an unequal height column of colder atmospheric air b. More density than an equal height column of colder atmospheric air c. Less mass than an equal height column of colder atmospheric air d. More mass than an equal height column of colder atmospheric air

Answer 48

Less mass than an equal height column of colder atmospheric air

Question 49

The balanced equation for complete combustion of sulfur is S + O2 = _________: Select one: a. SO2 + heat b. 2SO2 + heat c. SO2 d. SO2 + S

Answer 49

SO2 + heat

Question 50

What controls the combustion airflow to the furnace of an older HRT boiler and the flue gas flow from the furnace? a. Inlet damper control b. Underfire air and motor speed control c. Outlet damper control d. Overfire air or damper control Feedback

Answer 50

Overfire air or damper control

Question 51

The pressure range for pressure-atomizing burners fired with light fuel oil is approximately: Select one: a. 50 to 100 kPa b. 150 to 250 kPa c. 300 to 550 kPa d. 550 to 700 kPa

Answer 51

550 to 700 kPa

Question 52

If there is insufficient combustion air to a boiler furnace, the result will be: Select one: a. High CO2 readings in the flue gas b. High CO in the flue gases c. A reduction in draft fan power requirements d. Higher than normal flue gas temperature

Answer 52

High CO in the flue gases

Question 53

ASME CSD-1, CW-140 states that each automatically fired, high-pressure steam boiler must have which devices? a. At least two automatic low-steam pressure cut-off devices b. No low-water fuel cut-off devices c. At least two automatic low-water fuel cut-off devices d. At least one automatic low-water fuel cut-off devices

Answer 53

At least two automatic low-water fuel cut-off devices

Question 54

According to the CSA B-51 code, a blowoff tank is necessary to: Select one: a. Prevent high temperature and pressure in the sewer b. Prevent blowing off too quickly c. Remove sludge from blow-off water d. Reduce the boiler water velocity

Answer 54

Prevent high temperature and pressure in the sewer

Question 55

A multi-burner cluster has secondary and tertiary nozzles ignited by: Select one: a. An igniter spark b. An intermittent pilot flame c. An interrupted pilot d. The primary burner

Answer 55

The primary burner

Question 56

The simplest way to measure draft is with: Select one: a. A U-tube manometer b. A Bourdon tube device c. A flexible diaphragm device d. A bellows measuring device

Answer 56

A U-tube manometer

Question 57

A boiler blowoff system is equipped with slow and fast opening valves. The quick opening valve is placed: Select one: a. Closest to the boiler and opened first b. Furthest from the boiler and opened first c. Closest to the boiler and opened last d. Furthest from the boiler and opened last

Answer 57

Closest to the boiler and opened first

Question 58

A sudden drop in steam pressure causes Select one: a. a sudden increase in drum level b. a rapid collapse of steam bubbles in the boiler c. “shrinkage” d. a single element feedwater control to immediately add water to the drum

Answer 58

a sudden increase in drum level

Question 59

Shot cleaning pellets are transported to the top of the boiler: Select one: a. Using an air stream b. Manually c. By a steam injection system d. By a hydraulic hoisting system

Answer 59

Using an air stream

Question 60

An atomizing air compressor is usually: Select one: a. A variable displacement type b. A centrifugal type c. An axial type d. A small, rotary air compressor

Answer 60

A small, rotary air compressor

Question 61

During a soot blowing operation the boiler firing rate should be at least: Select one: a. 15% b. 50% c. 20% d. 80%

Answer 61

50%

Question 62

Boiler combustion is regulated by: Select one: a. Varying the speed of an ID fan b. Controlling or regulating the fuel flow c. Varying the speed of an FD fan d. Controlling the air and fuel flow

Answer 62

Controlling the air and fuel flow

Question 63

Which of the following strategies is NOT used to lower the potential for NOX production. a. Lowering the mixing time in the burner b. Increasing the fuel to air ratio c. Treating the combustion gases with chemicals that react with the NOX to produce other compounds d. Raising the combustion temperature Feedback

Answer 63

Raising the combustion temperature

Question 64

Maximum static pressure in a fuel oil line before the oil pump is limited by code to approximately: Select one: a. 10 kPa b. 15 kPa c. 35 kPa d. 70 kPa

Answer 64

35 kPa

Question 65

Which element in air will combine with the combustible elements of the fuel? Select one: a. Nitrogen b. Oxygen c. Hydrogen d. Carbon dioxide

Answer 65

Oxygen

Question 66

Soot blowers are essential equipment on a boiler fired with: Select one: a. Natural gas b. Solid fuels c. Propane d. Butane

Answer 66

Solid fuels

Question 67

For boilers operating above 690 kPa, what is the requirement for the blowoff piping? a. Have bends using 90° elbows b. Be made of galvanized piping c. Be at least Schedule 80 steel d. Have malleable iron fittings of Class 150 and Class 300 Feedback

Answer 67

Be at least Schedule 80 steel

Question 68

One of the advantages of using natural gas as a fuel in a boiler is: Select one: a. No storage space is required b. Low cost c. Abundance in supplies d. No standby fuel is necessary

Answer 68

No storage space is required

Question 69

The result of a condensate receiver that is too small could be: Select one: a. High boiler water level b. Overflowing of the condensate receiver c. Loss of make-up water d. Low make-up water flow rates

Answer 69

Overflowing of the condensate receiver

Question 70

The inclined “U” tube manometer: Select one: a. Will measure pressure in kPa b. Can only be used with mercury c. Is more accurate than a “U” tube manometer d. Is more difficult to read

Answer 70

Is more accurate than a “U” tube manometer

Question 71

Which of the following is NOT a pilot for a gas burner? Select one: a. Continuous b. Intermittent c. Manual d. Interrupted

Answer 71

Manual

Question 72

If not enough combustion air is given to an oil-fired flame: Select one: a. The flame will be dark and smoky b. The flame will be bluish with yellow tips c. Light gray smoke will leave the stack d. The flame will be bright yellow

Answer 72

The flame will be dark and smoky

Question 73

One operating variable that is manipulated relatively easily and which the operators of FBC boilers must always be aware, is: Select one: a. Slag production b. Fuel type variation c. Coal introduction techniques d. Bed expansion

Answer 73

Bed expansion

Question 74

Balanced draft: Select one: a. Requires weights on the dampers to balance them. b. Requires a tall smoke stack c. Uses a forced draft and an induced draft fan d. Is used for furnaces with positive pressure

Answer 74

Uses a forced draft and an induced draft fan

Question 75

What does a short, single-nozzle retractable wall blower remove? a. Deposits located in the superheater and reheater banks b. Water-wall ash deposits c. Deposits from the radiant heating surfaces d. Deposits from the convection surfaces

Answer 75

Water-wall ash deposits

Question 76

Gas burners for heating boilers can be divided into two general classes: Select one: a. Mixing and non-mixing b. Refractory and ribbon-type c. In-shot and up-shot d. Pre and after mix

Answer 76

Pre and after mix

Question 77

The Hartford loop will: Select one: a. Only be installed on multiple-boiler systems b. Ensure continuous circulation of a hot water system c. Prevent boiler water level from going below the lowest safe water level d. Replace the feedwater check valve

Answer 77

Prevent boiler water level from going below the lowest safe water level

Question 78

In a float type low water fuel cutoff, the main purpose of the mercury switch is to: Select one: a. Open the burner circuit when the level is high b. Close the burner circuit when the level is low c. Activate a low water alarm d. Open the burner circuit when the level is low

Answer 78

Open the burner circuit when the level is low

Question 79

Dissolved oxygen in condensate: Select one: a. Will cause waterside corrosion b. Can cause scaling on the return lines c. Is removed with amines d. Necessitates the installation of a deaerator Feedback

Answer 79

Will cause waterside corrosion

Question 80

A diaphragm draft gauge on a furnace indicates the draft in: Select one: a. mm of water column b. kPa c. MPa d. psi

Answer 80

mm of water column

Question 81

What does the frequency of a blowdown depend on? a. Condensate flow rate b. Rate of chemical addition c. Rate of steam production d. Blowoff piping design

Answer 81

Rate of steam production

Question 82

Stationary soot blowers are installed in the: Select one: a. Reheater bank b. Primary superheater bank c. Secondary superheater bank d. Convection zones

Answer 82

Convection zones

Question 83

In a typical bubbling fluidized bed boiler, to what depth is the combustion bed maintained? Select one: a. 1.5 metres b. 1 metre c. 2 metres d. 2.5 metres

Answer 83

1 metre

Question 84

When a gas-fired burner is operating properly: Select one: a. The flame will be blue with short yellow tips b. The furnace will pulsate c. There will be no turbulence d. It will have a long, bright, yellow flame

Answer 84

The flame will be blue with short yellow tips

Question 85

Due to the comparative size of FBC power plants, a significant saving is gained in: Select one: a. Fuel and waste costs b. Material and construction costs c. “Clinker” and soot blowing costs d. Fuel storage costs

Answer 85

Material and construction costs

Question 86

The steam used for soot blowing is usually: Select one: a. Low pressure b. Unsaturated steam c. The same as boiler drum pressure d. Superheated at the soot blower nozzle

Answer 86

Superheated at the soot blower nozzle

Question 87

A thermo hydraulic feed water regulator uses _____ as operating media. Select one: a. Oil and nitrogen b. CO2 and water c. Water and steam d. Air and water

Answer 87

Water and steam

Question 88

When using mechanical fuel oil atomization: Select one: a. 70 kPa steam pressure is required at the burner b. Dry saturated steam or superheated steam should be used c. High pump pressure is required d. 35 to 40 kPa oil pressure is required

Answer 88

High pump pressure is required

Question 89

Proper draft is important to the plant operator because it: Select one: a. Produces efficient combustion b. Keeps the furnace from overheating c. Reduces the quantity of ash produced d. Prevents flue gas from leaking out of the boiler

Answer 89

Produces efficient combustion

Question 90

What does the operating mechanism of a slow-opening valve require? a. Moving a lever through a small arc of about 90° b. A sliding disc that can cut through impurities c. Markings on the valve body indicating open and close positions d. At least five 360° turns to change from fully closed to fully open

Answer 90

At least five 360° turns to change from fully closed to fully open

Question 91

Water formed from the condensing of steam is called: Select one: a. Water b. Wet steam c. Condensate d. Waste water

Answer 91

Condensate

Question 92

A refractory burner disadvantage is: Select one: a. High cost due to complexity b. Too much fuel preheat c. Low radiant heat d. Low combustion efficiency

Answer 92

High cost due to complexity

Question 93

As a general rule the size of the condensate receiver should be large enough to hold a volume of condensate equal to the water evaporated by the boiler in a _____ period. Select one: a. One and one half hour b. One hour c. 45 minute d. 20 to 30 minute

Answer 93

20 to 30 minute

Question 94

Using lower combustion temperatures with fluidized bed combustion reduces the: Select one: a. Production of hot flue gases b. Boiler efficiency c. Production of NOX d. Turbulence of the furnace interior

Answer 94

Production of NOX

Question 95

Limestone, when added to a fluidized bed boiler Select one: a. Lowers the combustion bed temperature b. Acts as a de-sulphuring agent c. Absorbs NOx d. Reduces greenhouse gas emissions

Answer 95

Acts as a de-sulphuring agent

Question 96

The low water fuel cut-off of heating boiler must shut the fuel off if the water level drops: Select one: a. Below the top row of tubes b. Quickly c. To an unsafe level d. The lowest permissible water level

Answer 96

To an unsafe level

Question 97

The major disadvantages of oil over coal is that oil: Select one: a. Does not burn as clean b. Is more difficult to control c. Is more expensive and less abundant d. Requires more storage space

Answer 97

Is more expensive and less abundant

Question 98

The stack temperature of a boiler can rise if: Select one: a. Excess air is reduced b. The fireside of the boiler becomes dirty c. The percentage of CO in the flue gas rises d. The rate of fuel flow decreases

Answer 98

The fireside of the boiler becomes dirty

Question 99

The typical time required to heat a fluidized bed to ignition temperature prior to the introduction of coal is: Select one: a. One hour b. 30 minutes c. Two hours d. Three hours

Answer 99

One hour