block F review Flashcards
(124 cards)
1
Q
Which of the following best describes the ability to transfer heat or electricity from one particle to another?
Select one:
a.
Ductility
b.
Conductivity
c.
Tenacity
d.
Malleability
A
B
2
Q
“Sensible heat” is defined as heat required to bring about:
Select one:
a.
a change in the chemical state of matter
b.
a change in the physical state of matter
c.
a change in the temperature of matter
d.
a change in the shape of matter
A
C
3
Q
When water turns to steam, it’s volume will increase __________times.
Select one:
a.
970
b.
1700
c.
720
d.
144
A
B
4
Q
Latent heat” is defined as heat required to bring about:
Select one:
a.
a change in the temperate of matter
b.
a change in the chemical state of matter
c.
a change in the color of matter
d.
a change in the physical state of matter
A
D
5
Q
Which type of hanger or support would be used on a piping system that may experience a wide temperature variation?
Select one:
a.
Roller
b.
Trapeze
c.
Ring
d.
Clevis
A
A
6
Q
What must be done if a copper hot water line must be run through the side of a steel cabinet?
Select one:
a.
Use a plastic grommet and an annular space between the tubing and cabinet
b.
Use Polyken® tape on the tubing and leave a one inch air gap
c.
Use a rubber bushing with tubing tight to the· cabinet
d.
Make the hole in the cabinet only slightly larger than the tubing, but anchor the tubing with a riser clamp
A
A
7
Q
The device which prevents a hydronic heating system from “popping” the pressure relief valve is the:
Select one:
a.
flow check
b.
tridicator
c.
cushion tank
d.
backflow preventer
A
C
8
Q
To avoid circulation problems, pumps in a hydronic heating system should be placed:
Select one:
a.
on the return main, close to the boiler
b.
immediately downstream of the cushion tank connection
c.
immediately upstream of the cushion tank connection
d.
on the supply main, close to the boiler
A
B
9
Q
A ___________vent is a type of automatic air vent used in hydronic heating systems.
Select one:
a.
coin
b.
ball
c.
float
d.
manual
A
C
10
Q
An expansion tank used in a hydronic heating system should be able to accommodate a_________increase in water volume.
Select one:
a.
20 %
b.
2 %
c.
10 %
d.
4 %
A
D
11
Q
The type of heating system most likely found in a modern apartment building is:
Select one:
a.
a reverse-return system
b.
a monoflow system
c.
a series-loop system
d.
one pipe system
A
A
12
Q
The type of valve used to even out the flow in a split-zone heating system is the:
Select one:
a.
check valve
b.
pressure reducing valve
c.
balancing valve
d.
ball valve
A
C
13
Q
The type of valve needed on the domestic hot water side of a heat exchanger would be a___________valve.
Select one:
a.
gate
b.
tempering
c.
solenoid
d.
globe
A
B
14
Q
Which pipe should not be insulated on a gravity hot water heating system?
Select one:
a.
Supply main from boiler
b.
Return mains to boiler
c.
Supply runouts to heat transfer units
d.
Supply risers
A
B
15
Q
Type _________copper tube can be found in fin-tube for hydronic heating systems.
Select one:
a.
L
b.
M
c.
K
d.
H
A
D
16
Q
A floor panel in a radiant heating system should not exceed ________°F.
Select one:
a.
95
b.
65
c.
75
d.
85
A
A
17
Q
What device is used to sense an unsafe water level in a hot water heating system ?
Select one:
a.
A low water cutoff
b.
An automatic check valve
c.
A low limit immersion thermostat
d.
A low limit aquastat
A
A
18
Q
Which term best describes the amount of energy required to raise the temperature of one pound of water through 1°F?
Select one:
a.
Btu
b.
Latent
c.
Watt
d.
Calorie
A
A
19
Q
What must be known in order to properly size the output of a pump for a hydronic
heating system?
Select one:
a.
Pump body construction
b.
Pump flange sizes
c.
Feet of head and equivalent length
d.
Required GPM and total feet of head
A
D
20
Q
When are supplemental heating units installed in radiant floor heating systems?
Select one:
a.
When the radiant floor does not keep up with the heat load .
b.
When the applications have slab on grade
c.
When ceramic tile is installed in an application
d.
When there are large picture windows
A
A
21
Q
What is required when a conventional boiler is installed in a low-temperature radiant floor heating application?
Select one:
a.
A bypass pump between the high and low temperature piping
b.
A mixing valve
c.
Two temperature gauges
d.
A two-stage regulator
A
B
22
Q
After completing the water piping in a hydronic heating system, the installer should:
Select one:
a.
clock the gas meter
b.
flush the piping to remove all impurities
c.
smoke-test the venting system
d.
test the safety relief valve on the boiler
A
B
23
Q
Kickspace heating units are ideal for which type of application?
Select one:
a.
Heating the joist space area
b.
Heating the attic space
c.
Heating below pantries and storage areas
d.
Floor space is limited due to cabinets and cupboards
A
D
24
Q
What is the procedure for calculating the amount of finned baseboard required in a given space?
Select one:
a.
Divide the baseboard output by the wall area
b.
Divide the space heat loss by the output rating of the baseboard selected
c.
Multiply the area of the space being heated by the output of the baseboard
d.
Divide the length of the outside wall by the output of the baseboard
A
B
25
What is the best location for installing baseboard fin?
Select one:
a.
On interior walls directed towards the center of the room
b.
Two to three feet higher than the floor
c.
Above doorways
d.
On exterior walls with or without windows
D
26
What is the length of fin that would be required for a room with a heat loss of 8,000 Btuh. if the fin had an output rating of 450 Btuh/ft
Select one:
a.
20 feet
b.
14 feet
c.
16 feet
d.
18 feet
D
27
Which of the following items would be required for a vertical discharge unit heater connected to a hot water heating system?
Select one:
a.
Automatic air vent, drain valve, balancing valve
b.
2 shut-off valves, drain valve, balancing valve, mixing valve
c.
2 shut-off valves, automatic air vent, drain valve, balancing valve
d.
2 shut-off valve, automatic air vent, drain valve, mixing valve
C
28
What is the purpose of a balancing valve?
Select one:
a.
To equalize pressure between supply and the return header
b.
To control the flow rate from the boiler
c.
To equalize boiler supply temperature and return temperature
d.
To adjust flow rates to each heat transfer unit
D
29
Where should you locate air vents?
Select one:
a.
At all high points
b.
At convenient locations for servicing
c.
At all heat transfer units
d.
At the suction and discharge of the circulator
A
30
Which piece of equipment would be required on all steam boilers and hot water boilers over 400 MBH?
Select one:
a.
Low water cut-off
b.
Diaphragm tank
c.
Pressure controls
d.
Sight tube
A
31
If a heating system requires a heat exchanger for a low temperature secondary loop, what additional equipment would be required on the secondary loop ?
Select one:
a.
Expansion tank and high limit
b.
Circulator and expansion tank
c.
Expansion tank. and a burner
d.
Circulator and a burner
B
32
The minimum return water temperature for a non-condensing boiler is:
Select one:
a.
180 °F
b.
212°F
c.
60 °F
d.
140°F
D
33
What provides the circulation in a gravity hot water heating system?
Select one:
a.
A pump
b.
Atmospheric pressure
c.
Head pressure
d.
The difference in densities between the supply water and the return water
D
34
When using a solar heating system to heat domestic hot water, which of the following pieces of equipment would be required?
Select one:
a.
Heat exchanger
b.
Evaporator
c.
Condenser
d.
High pressure switch
A
35
What is a heated area that is regulated by one circulator control or thermostat?
Select one:
a.
Thermal mass
b.
Transmission
c.
Zone
d.
Reactive control
C
36
How does a forced-air heating system heat a room or space?
Select one:
a.
From the ceiling down to the floor
b.
The heat radiates to the ceiling from the floor area
c.
By the formation of radiant waves
d.
By heat radiating off of warm objects
A
37
Where should the connections be made on an upfed cast iron radiator?
Select one:
a.
Bottom in, top out
b.
Bottom in, bottom out
c.
Top in, bottom out
d.
Top in, top out
B
38
The recovery rate of a hot water tank is represented as:
Select one:
a.
Btuh
b.
GPH
c.
Btu / lb
d.
GPM
B
39
How much expansion would occur on a 300-foot steel pipe installed at 49 °F and operating at 180°F? (The C.O.E. for steel is .0000061)
Select one:
a.
.24 inches
b.
3.4 inches
c.
2.4 inches
d.
2.87 inches
D
40
How much expansion would take place in 300 feet of copper pipe if it is heated from 70° to 180°F? (The C.O.E. for copper is .0000095)
Select one:
a.
0.0342 inches
b.
1.254 inches
c.
3.762 inches
d.
0.3135 inches
C
41
How many Btu's are required to raise the temperature of 40 imperial gallons of water from 60° to 160°F?
Select one:
a.
4000 Btus
b.
25000 Btus
c.
40000 Btus
d.
2500 Btus
C
42
Why is it easier to balance a reverse return hot water heating system as compared to a direct return system?
Select one:
a.
The first unit supplied from the boiler is the first unit to return to the boiler
b.
The piping distance to and from each heat transfer unit is the same
c.
The water temperature to each heat transfer unit is the same
d.
The water must travel through each heat transfer unit in series
B
43
How many millimeters of expansion would be expected if 12 m of copper tubing is heated from 6° to 45°C and the coefficient of expansion is 0.000017?
Select one:
a.
0.008mm
b.
9.18mm
c.
1.22 mm
d.
7.96 mm
D
44
Which considerations must be met when determining the placement of a boiler?
Select one:
a.
Heat load, water capacity, temperature
b.
Electrical supply, gas supply, water supply
c.
Local codes, venting locations, piping layout
d.
Outdoor temperature, flow rate, output
C
45
Which piece of equipment must be installed if a space heating boiler is being used to heat domestic hot water?
Select one:
a.
Mixing valve
b.
Heat exchanger
c.
Air proving switch
d.
Pressure switch
B
46
If a hydronic cooling unit is being installed at the lowest point of the system, What is required?
Select one:
a.
Low .water cut-off
b.
Pressure reducing valve
c.
Low point drain
d.
Automatic air vent
C
47
What would be installed between a cooling fan coil and the fixed piping attached to the building structure?
Select one:
a.
Swing joints and di-electric fittings
b.
Union and expansion joint
c.
Vents and drains
d.
Isolation valves and flex connectors
D
48
What would be installed in the piping to and from a chiller when it is being supported by rubber isolation pads?
Select one:
a.
Spring hanger
b.
Swing joint
c.
Restraint cable
d.
Flex connectors
D
49
Where would the flow switch be installed in a hydronic heating system using a low mass boiler?
Select one:
a.
On the hot water return line to the boiler
b.
On the hot water supply line from the boiler
c.
On the supply piping to the last heat transfer unit
d.
On the make-up water line to the boiler
B
50
What is the purpose of a high limit when installed on a hot water boiler?
Select one:
a.
To ensure the water temperature does not exceed maximum allowable temperature
b.
To ensure the water temperature is at least 140°F
c.
To ensure the boiler pressure is at least 10 PSIG
d.
To ensure the boiler pressure does not exceed 30 PSIG
A
51
What is used to prove water circulation through a low mass boiler before the main burner can ignite?
Select one:
a.
Flow switch
b.
Operating aquastat
c.
High pressure switch
d.
End switch
A
52
How is the water level maintained in the reservoir of a cooling tower?
Select one:
a.
Four-way mixing valve
b.
Air volume control
c.
Float switch
d.
Low water cut-off
C
53
If a unit heater is to be installed in a shop with a bay door, which direction should the unit heater discharge?
Select one:
a.
Any of the options are correct
b.
Across the door
c.
Away from the door
d.
At the door
B
54
Where should the balancing valves be located for a radiant panel heating system ?
Select one:
a.
On the return header
b.
On the supply line to each heat transfer unit
c.
On the supply header
d.
On the outlet of each mixing valve
A
55
Where is the best location to install a hydronic baseboard in a room ?
Select one:
a.
On an outside wall near the ceiling
b.
On an outside wall near the floor
c.
On an interior wall near a window
d.
On an interior wall close to a door
B
56
When a boiler is being used to heat the domestic water through an indirect tank, besides a tempering valve, what else is required on the domestic water piping?
Select one:
a.
Check Valve
b.
Air Volume Control
c.
Booster Pump
d.
Vacuum Breaker
A
57
What is the purpose of an outdoor boiler reset control?
Select one:
a.
It adjusts the boiler water temperature depending on the boiler pressure
b.
It adjusts boiler pressure depending on boiler water temperature
c.
It adjusts the boiler water temperature depending on the indoor temperature
d.
It adjusts the boiler water temperature depending on the outdoor temperature
D
58
When should in-slab radiant heating not be used?
Select one:
a.
If the concrete is more than 75 mm thick
b.
If the outdoor design temperature is below o°c
c.
If the bedding material below the slab is sand
d.
If there is a high water table
D
59
When are supplemental heating units installed in conjunction with radiant floor heating systems?
Select one:
a.
When the boiler water supply temperature is above 70°C
b.
When there are more than six zones within the building
c.
When the boiler water return temperature is below 60°C
d.
When the radiant system cannot keep up with the heat load
D
60
What should be the minimum distance required between the flow switch and the 90 degree elbow?
Select one:
a.
7 1/2 inches
b.
1 1/2 inches
c.
15 inches
d.
5 inches
A
61
Which of the following items would be required for a down-fed heat convector?
Select one:
a.
Manual air vent and a drain
b.
Unions and a manual air vent
c.
Isolation valves and an automatic air vent
d.
Isolation valves and drain
D
62
Chillers typically have which type of piping connection ?
Select one:
a.
Welded
b.
Threaded
c.
Flanged
d.
Brazed
C
63
If cooling coils are installed within the ducting of a heating/cooling system what is required?
Select one:
a.
Service access and an air vent
b.
Float switch and a condensate drain
c.
Float switch and an air vent
d.
Service access and a condensate drain
D
64
What type of backflow preventer would be required on the makeup water line to a boiler having treated water?
Select one:
a.
RPDA
b.
RPBA
c.
DCVA
d.
DCAP
B
65
What is the most important consideration when determining the location of a boiler?
Select one:
a.
The electrical supply location
b.
The gas supply location
c.
The water supply location
d.
The venting location
D
66
Why should copper heating lines not be installed tight against wood studs ?
Select one:
a.
Fire hazard
b.
Structural damage
c.
Corrosion
d.
Noise
D
67
What steps must be done when installing the piping for infloor radiant heating?
Select one:
a.
Wrap the plastic tubing around the rebar then attach the rebar to the wooden forms and then pour concrete
b.
Attach the plastic tubing to the rebar, pressure test with water and maintain the test while the concrete is poured
c.
Attach the plastic tubing to the rebar, pressure test with air or water, but drain completely before pouring concrete
d.
Attach the plastic tubing to the rebar, pressure test with air and drop the test before the concrete is poured
B
68
At what height should the low water cut-off for a hot water boiler be installed ?
Select one:
a.
Level with the operating aquastat
b.
Level with the high-limit aquastat
c.
Above the boiler.
d.
Above the primary relay coil
C
69
What is the minimum rating for the relief valve on a hot water boiler?
Select one:
a.
75 % of MBH rating
b.
100 % of MBH rating
c.
200 % of MBH rating
d.
150 % of MBH rating
B
70
What is used to minimize vibrations from a cooling tower to the building structure?
Select one:
a.
Swing joints
b.
Expansion shields and plugs
c.
Isolation pads
d.
Roller hangers
C
71
Which preliminary steps must be taken when preparing a radiant panel heating system for a pressure test?
Select one:
a.
Isolate the radiant panels
b.
Isolate what can't handle high pressure
c.
Open air vents
d.
Isolate the pump and expansion tank
B
72
What is the minimum return water temperature for a non-condensing boiler?
Select one:
a.
50 °C
b.
55 °C
c.
60 °C
d.
65 °C
C
73
Where should the outlets from a ducted cooling system be located?
Select one:
a.
Close to doorways
b.
Near the floor
c.
Near the ceiling
d.
Adjacent to the cold air returns
C
74
Which of the following would be the most important consideration when determining the location of a chiller?
Select one:
a.
Service accessibility
b.
Fuel or power source
c.
Venting
d.
Close to thermostats
A
75
What is a primary concern for location of a condensing boiler?
Select one:
a.
Drainage
b.
Return water temperature
c.
Supply water temperature
d.
The height of the chimney
A
76
What type of heat transfer unit could be installed in a kitchen if there was no wall space due to cabinets?
Select one:
a.
In floor heating
b.
Kick space heater
c.
Cast iron radiator
d.
Baseboard heaters
B
77
Where is the backflow preventer located for a boiler?
Select one:
a.
On the make-up supply to the boiler
b.
On the return to the boiler
c.
Between the boiler and the expansion tank
d.
On the supply after the expansion tank
A
78
Where is the best location to install a thermostat for a zone in a hydronic heating system?
Select one:
a.
On an interior wall with the lowest heat loss
b.
On an exterior wall near an entrance or exit
c.
On an interior wall central to the zone
d.
On an exterior wall with the highest heat loss
C
79
At what height should a heating thermostat be installed?
Select one:
a.
3 ft. (900 mm)
b.
5 ft. (1.5 m)
c.
4 ft. (1.2 m)
d.
6 ft. (1.8 m)
B
80
When installing a gas-fired hot water tank, the most important consideration would be locating the route of the:
Select one:
a.
gas piping
b.
venting
c.
water piping
d.
combustion air
B
81
What considerations must be made when installing a boiler on a floor?
Select one:
a.
It must be installed on a housekeeping pad
b.
The floor must be flat and solid
c.
It must be a non-combustible floor
d.
Mount isolation pads on the floor before setting the boiler
B
82
Large high amperage draw electric motors are typically what phase?
Select one:
a.
2
b.
1
c.
3
d.
4
C
83
How should the float switch be wired to a pump supplying a cooling tower?
Select one:
a.
In series with the pressure switch and parallel with the pump
b.
In series and before the pump
c.
In series and after the pump
d.
In series with the high limit and parallel with the pump
B
84
A low-pressure steam boiler has a set operating pressure of 5 PSIG below the maximum allowable pressure determined by the ASME code. The differential of the Pressuretrol is 4 PSIG. What is the cut-in pressure?
Select one:
a.
14 PSIG
b.
3 PSIG
c.
21 PSIG
d.
6 PSIG
D
85
Which location is most suitable for the installation of a cooling tower?
Select one:
a.
Outside, in a ventilated area
b.
Outside, enclosed by an airtight structure
c.
In the mechanical room, with adequate drainage
d.
As close as possible to the evaporator
A
86
Name the principle cause of water hammer in a steam heating system:
Select one:
a.
water particles suspended in steam
b.
wet steam passing through steam traps
c.
water allowed to build up in piping
d.
water droplets carried along the inside of pipes
C
87
On what principle does a thermodynamic steam trap operate?
Select one:
a.
It operates on the difference in density between the steam and condensate.
b.
It operates with a fixed orifice position
c.
It operates on the difference in velocity between water and steam
d.
It senses the difference in temperature between water and steam
C
88
Where is the air scoop located on a hydronic cooling system?
Select one:
a.
Where the pressure is highest and the temperature is lowest
b.
Where the pressure is lowest and the temperature is highest
c.
Where the pressure is lowest and the temperature is lowest
d.
Where the pressure is highest and the temperature is highest
B
89
Where is the cooling coil located on a combination heating and cooling furnace system?
Select one:
a.
In the return plenum at least 10 feet from the furnace
b.
In the supply plenum close to the furnace
c.
In the supply plenum at least 10 feet from the furnace
d.
In the return plenum close to the furnace
B
90
All heat pumps operate on the refrigeration principle that when a liquid vaporizes heat is?
Select one:
a.
Released
b.
Absorbed
c.
Equalized
d.
Sublimated
B
91
What is the pressure relief setting on a storage tank that’s in conjunction with a heating system?
Select one:
a.
75 PSIG
b.
250 PSIG
c.
100 PSIG
d.
150 PSIG
D
92
In today’s modern hot water heating applications solar heating has become very popular. What are the two most common types of solar collectors used?
Select one:
a.
Photo Voltaic Panel/Evacuated Tube
b.
Flat plate panel/ Photoconductive Tube
c.
Flat plate panel/Evacuated Tube
d.
Photoconductive Panal/UV detector tube
C
93
How many BTU’s are required to melt a ton of ice in a 24 hour period?
Select one:
a.
12,000 BTU
b.
320,000 BTU
c.
22,000 BTU
d.
288,000 BTU
D
94
The earth’s surface temperature changes all around but at depths of 2m or more the temperature remains fairly constant. Geothermal systems take advantage of this temperature which is approximately?
Select one:
a.
32 degrees Celcius
b.
0 degrees Celsius
c.
15 degrees Celsius
d.
60 degrees Celsius
C
95
In a building that requires a water cooled chilling tower, where is the best location for the chiller?
Select one:
a.
Outside the building on ground level
b.
On the roof outside
c.
Cooling towers don’t use chillers
d.
Basement/Parkade
D
96
When referring to water that circulates in a hydronic close loop system, what is a typical degrees Fahrenheit differential in the supply and return?
Select one:
a.
11
b.
3
c.
10
d.
20
D
97
If water flowing at the rate of 7 GPM (Imperial) leaves a hot water boiler at 160°F and returns at 140°F, how many Btu of sensible heat will be given up by the water in one hour?
Select one:
a.
48,000 btu/hr
b.
84,000 btu/hr
c.
4,200 bth/hr
d.
70,000 btu/hr
B
98
What is the most common type of steam trap?
Select one:
a.
Thermostatic
b.
Thermodynamic
c.
Disc type
d.
Inverted bucket
D
99
A circulator used in a heating system is being supplied with 110V. When using a multimeter to check the difference of potential with the VAC setting, what should the voltage drop be while the circulator is operating?
Select one:
a.
110 V
b.
You should never check for a voltage drop while the pump is running
c.
0 V
d.
You don’t check for difference in potential with a volt meter
A
100
In Geothermal system’s the ground loops whether horizontal or vertical are typically ran in what type of pipe?
Select one:
a.
PEX
b.
FRP
c.
CPVC
d.
HDPE
D
101
How many btu’s of heat would be required to turn 15lbs of water into steam?
Select one:
a.
21,577 BTU
b.
14,556 BTU
c.
7,157 BTU
d.
2,160 BTU
B
102
There are many different ways to install radiant tubing in a room, but when installing your loop on an outside wall what’s the center to center measurement of the tubing?
Select one:
a.
8”
b.
4”
c.
12”
d.
6”
D
103
A category 1 boiler calls for heat the pump turns on, the zone valve and end switch have 24V, you proved this with your multi-meter. What would be the reason the boiler didn’t fire on the call for heat?
Select one:
a.
Frozen pipe
b.
Faulty pressure switch
c.
Faulty aquastat
d.
Faulty outdoor sensor
C
104
In a heating system that requires a glycol additive, what percentage of glycol is typically added to the system?
Select one:
a.
50%
b.
40%
c.
20%
d.
30%
D
105
It is recommended that a cooling tower be inspected and cleaned for sediment and scale build up at least once a month to prevent?
Select one:
a.
Galvanic Corrosion
b.
Overheating Pump
c.
Heat transfer
d.
Legionella Growth
D
106
How do you prevent water hammer in a steam system?
Select one:
a.
Water Hammer Arrestor
b.
Expansion Tank
c.
Strainers
d.
Remove trapped water using drains
D
107
When pouring concrete on top of radiant tubing, how can you protect the tubing from being damaged?
Select one:
a.
Keep piping under test
b.
Strap to rebar
c.
Insulate the pipe
d.
Sleeve pipe
A
108
Approximately how many liters of a 100% glycol solution would be required to increase a 700L heating system at 25% glycol to 33% glycol?
Select one:
a.
231L
b.
56L
c.
75L
d.
175L
C
109
What’s the most common material used to neutralize condensate from a hot water boiler?
Select one:
a.
Charcoal
b.
Limestone
c.
Iron Sulfate
d.
Zeolite
B
110
On a tankless water heater where is the flow switch typically located?
Select one:
a.
Flow control valve
b.
On the pump
c.
Cold water inlet
d.
Hot water inlet
C
111
On a no heat call to a gas fired hot water heater, the pilot will not stay lit. Even after replacing the thermocouple the pilot won’t stay on, what could be the cause?
Select one:
a.
Block vent
b.
Pressure switch
c.
Air lock
d.
ECO switch
D
112
What color are used to identify the conductors in a 120-volt , three wire cable ?
Select one:
a.
Black , red and white
b.
Black , blue and green
c.
Red , blue and green
d.
Blue , red and white
A
113
A loose wire on an operating aquastat may :
Select one:
a.
Prevent the main burner from firing
b.
Cause the primary pump to stop circulating
c.
Prevent the thermostat from functioning properly
d.
Overheat the boiler
A
114
What is the problem if a hot water heating system contains black , smelly water (brackish) ?
Select one:
a.
PRV set too high
b.
Leak somewhere in the system
c.
There is no problem
d.
Faulty relief valve
C
115
Which of the following components would be faulty if on a call for heat , the zone valve motor opens but the circulator does not become energized ?
Select one:
a.
Aquastat
b.
High limit
c.
Thermostat
d.
Zone valve end switch
D
116
Which of the following would cause a copper fin-tube boiler to be noisy and vibrate during operation ?
Select one:
a.
Calcified heat exchanger
b.
Excessive dilution air
c.
High return water temperature
d.
manifold pressure too high
A
117
What would be the most likely problem if "No Heat" complaints were being received from the occupants of the top floor of an apartment building ?
Select one:
a.
Air locks
b.
Circulator too large
c.
Supply water temperature too high
d.
Return water temperature too low
A
118
How do you increase the water temperature from a pressure balancing valve ?
Select one:
a.
Replace the pressure balancing valve
b.
Decrease the size of the cold water inlet piping
c.
Increase the size of the hot water inlet piping
d.
Adjust the limit stop
D
119
A hot water heating system has three zones. Two of the zones are working fine , but when the third zone valve opens the circulator does not start and the burners do not fire. What is the most likely cause ?
Select one:
a.
The primary relay coil needs replacement
b.
Faulty end switch on the third zone valve
c.
Corroded terminals on the boiler flow switch
d.
Outdoor boiler reset needs to be adjusted
B
120
What is the danger of water at or above 212°F in a hot water tank?
Select one:
a.
There will be steam coming from faucets
b.
Copper tubing is not rated for temperatures above 200°F
c.
The water in the tank will vaporize
d.
The steel tank will rupture
A
121
If a hot water tank rumbles when the burner fires up, what may be the problem?
Select one:
a.
Hardness scale buildup on the bottom of the tank
b.
Excessive condensation in the B-vent
c.
Faulty temperature and pressure relief valve
d.
Water pressure is above 80 PSIG
A
122
How do you change the top element in a hot water tank?
Select one:
a.
Shut off power, shut off water, drain tank, change element, close drain, turn on water, turn on power.
b.
Shut off power, shut off water, change element, turn on water, turn on power.
c.
Shut off water, drain tank, shut off power, change element, turn on power, close drain, turn on water.
d.
Shut off power, change element, turn on power.
A
123
What would be the problem if on a routine boiler maintenance you noticed that the boiler water is clean and clear?
Select one:
a.
A blocked air vent
b.
There is no problem
c.
A leak in the system
d.
A faulty zone valve end switch
C
124
When servicing a gas-fired commercial hot water tank, the pilot won't stay lit when the gas control knob is released, an open circuit test of the thermocouple indicates 24 mV, what is most likely to be the faulty component?
Select one:
a.
Energy cut-out
b.
Transformer
c.
Gas valve
d.
Thermocouple
A
