WorksheetsState Test HVAC Sampler 41723
Total questions: 70
Worksheet time: 2hrs 20mins
Name
Class
Date
1.
Commercial Refrigeration is a process in which work is done to move heat from one location to another. The heat transport is traditionally by mechanical or absorption control of ___.
a)
non-cyclic cooling
b)
low-temperature absorption
c)
vapor-compression
d)
humidity and temperature
e)
Refrigeration MR20thEd 21.1.8
2.
The access door for a fire damper shall be labeled with letters NOT less than ___ in height.
a)
1/2 inch
b)
3/4 inch
c)
1 inch
d)
1 1/2 inch
e)
Mechanical IMC 2018 607.4
3.
Clear space above ground of the lowest portion of mechanical equipment suspended from a floor shall be AT LEAST ___ inches.
a)
6
b)
4
c)
10
d)
8
e)
Fuel Gas IFGC 2018 305.7
4.
Authorized personnel must inspect excavations, when is it necessary to inspect such excavations?
a)
at least every other day
b)
for flagging
c)
after every rainstorm
d)
at least once a week
e)
OSHA OSHA
5.
What is the effect of sensible heat?
a)
it changes the state of a substance without changing its temperature
b)
it changes the temperature of a substance without changing its state
c)
it changes both the state of a substance and its temperature
d)
it does not change the temperature or the state of a substance
e)
Refrigeration MR20thEd 67
6.
Regarding motors: ONE horsepower equals to ___.
a)
30.0 ohms
b)
27.8 amps
c)
746.0 watts
d)
120.0 volts
e)
Refrigeration MR20thEd 340
7.
What effect does rising temperature have on a container of saturated vapor and liquid refrigerant?
a)
has no effect
b)
saturated vapor volume decreases
c)
pressure increases
d)
liquid volume decreases
e)
Refrigeration MR20thEd 248
8.
Which instrument is used to obtain air velocity values?
a)
hydrometer
b)
pedometer
c)
odometer
d)
anemometer
e)
Refrigeration RACT8thEd 1098
9.
What system problem can be avoided by correctly sizing the low-side filter drier at the compressor end of the suction line?
a)
Flood back to the compressor
b)
Expansion valve hunt
c)
Resistance to flow of the vaporized refrigerant
d)
Compressor over heating
e)
Refrigeration MR20thEd 22.2.4
10.
With proper care, nitrogen or carbon dioxide may be used safely when pressure testing for leaks. What safety precaution must be followed when pressure testing for leaks?
a)
use a pressure reducing device that has both a pressure regulator and a pressure relief valve.
b)
pre-test each device prior to installation.
c)
use refrigerant in system to test for leaks.
d)
test for negative pressure at the start of testing.
e)
Refrigeration MR20thEd 11.3.1
11.
Gas pipe made of ___ is the one approved to use in underground applications only.
a)
aluminum
b)
steel
c)
copper
d)
plastic
e)
Fuel Gas IFGC 2018 404.15.1
12.
What is any portion of a refrigerating system under condenser pressure?
a)
cooling system
b)
circulating system
c)
high side
d)
low side
e)
Refrigeration MR20thEd 1593
13.
The _____ thermostat wire is the one approved to pass through air ducts.
a)
smoke-rated
b)
fire-rated
c)
plenum-rated
d)
shock-rated
e)
Mechanical IMC 2018 602.2.1.1
14.
Every portion of Type I hood shall have clearance from unprotected combustible construction of not less than
a)
6 inches
b)
12 inches
c)
18 inches
d)
24 inches
e)
Mechanical IMC 2018 507.9
15.
When adjusting superheat setting with a thermal expansion valve, what effect does increasing the superheat have on the system?
a)
starves the evaporator
b)
floods the evaporator
c)
cools the evaporator
d)
none of the above
e)
Refrigeration MR20thEd 479
16.
Ducts installed within a single dwelling unit shall be sized in accordance with ACCA Manual ____ or other approved methods.
a)
G
b)
F
c)
E
d)
D
e)
Mechanical IMC 2018 603.2
17.
A steel piping in a hydronic system needs to be installed. Indicate the MAXIMUM vertical spacing in accordance with MSS.
a)
18 feet
b)
15 feet
c)
12 feet
d)
9 feet
e)
Mechanical IMC 2018 Table 305.4
18.
FRom the expansion valve, an external equalizer line usually runs to the
a)
condenser
b)
compressor
c)
inlet of the evaporator
d)
outlet of the evaporator
e)
Refrigeration MR20thEd 483
19.
What device prevents slugging in a heat pump system?
a)
A receiver
b)
A suction line heater
c)
A suction line accumulator
d)
A defrost thermostat
e)
Refrigeration MR20thEd 461
20.
Suspended ventilating ceiling material shall have a flame-spread index on ___.
a)
both sides
b)
the top side only
c)
the bottom side only
d)
either the top or bottom sides
e)
Mechanical IMC 2018 602.2.1
21.
Referring to louvers and grilles and their required size of openings for combustion, ventilation and dilution air: screens shall have a mesh size NOT SMALLER THAN ____ inches.
a)
1/2 inch
b)
3/8 inch
c)
1/8 inch
d)
1/4 inch
e)
Mechanical IMC 2018 1105.6.2
22.
The STARTING running voltage used on a 208-volt motor is ___.
a)
187 volts
b)
228 volts
c)
175 volts
d)
208 volts
e)
Refrigeration MR20thEd 644
23.
Flexible air ducts, both metallic and non-metallic, shall be ____.
a)
not be limited in length
b)
limited to 6 feet in length
c)
limited to 12 feet in length
d)
limited to 15 feet in length
e)
Mechanical IMC 2018 603.6.1.1
24.
In hydronic systems, a closed expansion tank should have an automatic or manual air vent located ____.
a)
at the farthest point from the pump
b)
at the high point of the system
c)
at the low side of the system
d)
at the highest pressure point
e)
Refrigeration MR20thEd 1046
25.
According to the International Mechanical Code, which type of refrigeration system may be tested and proved tight after installation with air as the test gas?
a)
R-718
b)
R-717
c)
R-125
d)
R-124
e)
Mechanical IMC 2018 1108.2 Exception
26.
Ducts and air transfer openings that penetrate fire partitions are approved when they are ____.
a)
protected with an approved fire damper
b)
covered with fireproof wrap
c)
are never approved
d)
sealed with fire rated caulk
e)
Mechanical IMC 2018 607.5.3
27.
A gas piping system must be equipped with a ___ to gather condensation
a)
a filter
b)
a sediment trap
c)
a drop
d)
an evaporator
e)
Fuel Gas IFGC 2018 408.2
28.
Select the LEAST unobstructed area of supply and return ducts approved for a warm air furnace.
a)
6 square inches/1,000 Btu
b)
6 square feet/1,000 Btu
c)
2 square inches/1,000 Btu
d)
2 square feet/1,000 Btu
e)
Mechanical IMC 2018 918.2
29.
A direct vented appliance rated at 50,000 Btu/h shall be located so that a minimum clearance of ____ is maintained between vent terminals and from any openings through which combustion products enter the building.
a)
9 inches
b)
6 inches
c)
3 inches
d)
2 inches
e)
Mechanical IMC 2018 804.2.1
30.
Most commercial refrigerating systems use hot gas mufflers for comfort cooling in air conditioning. Mufflers are usually installed near the condenser, usually vertically. A muffler that is not installed correctly could trap what?
a)
refrigerant
b)
dangerous vapors
c)
oil
d)
hot suction gasses
e)
Refrigeration MR20thEd 447
31.
Venting systems shall NOT extend into or pass through any fabricated ___ or furnace plenum.
a)
crawl space
b)
attic space
c)
enclosed chase
d)
air duct
e)
Fuel Gas IFGC 2018 503.3.5
32.
Which is common type of motor system used on hermetically-sealed compressors?
a)
induction two-phase and polyphase
b)
repulsion-start, induction-run
c)
capacitor-start, induction-run
d)
induction run
e)
Refrigeration MR20thEd ?
33.
Except for a range and dryer connectors, the maximum length of approved listed flexible-metal tubing for fuel gas connectors is ___ feet.
a)
2
b)
3
c)
4
d)
6
e)
Fuel Gas IFGC 2018 411.1.3.1
34.
A ____ fits perfectly this definition: "Electrical control that is operated by changing humidity."
a)
transformer
b)
dehumidifier
c)
humidistat
d)
humidifier
e)
Refrigeration MR20thEd 927
35.
Area or zone in a climate or psychrometric chart described as: "the range of generally comfortable temperature, humidity, and sometimes air movement" is known as the ___.
a)
safety zone
b)
dalton zone
c)
leo zone
d)
comfort zone
e)
Refrigeration MR20thEd 702
36.
Which of the following is not included in air conditioning and refrigeration maintenance?
a)
repair work
b)
service work
c)
replacement of part of systems
d)
installation or replacement of complete systems
e)
Refrigeration MR20thEd 3.1
37.
What precaution must always be used when pressure testing a system with nitrogen or carbon dioxide for leaks?
a)
an oil separator must be installed in the connecting piping to avoid contaminating the system
b)
use a pressure reducing device that has both a pressure regulator and a pressure relief valve
c)
a dryer must always be installed in the connecting piping to prevent moisture from entering
d)
nitrogen must not be left in the system more than a few hours or it will began to react chemically
e)
Mechanical IMC 2018 605.1
38.
What does a sling psychrometer measure directly?
a)
temperature and dew point
b)
heat and cold
c)
grain and drops
d)
wet bulb and dry bulb
e)
Refrigeration MR20thEd 696
39.
What is the piston displacement of a compressor with a 2-inch bore and a 3-inch stroke?
a)
9.42 cubic inches
b)
12.00 cubic inches
c)
14.14 cubic inches
d)
37.70 cubic inches
e)
Refrigeration MR20thEd 1387
40.
How many CFM of ventilation air is required for a 50,000 Btu/hr infrared heater?
a)
100
b)
200
c)
300
d)
400
e)
Fuel Gas IFGC 2018 630.3
41.
How can the head pressure in an air-cooled condenser be determined?
a)
by taking the operational pressure
b)
by subtracting the condenser temperature from the room temperature
c)
by subtracting 25 degrees F (13 degrees C) from the present condenser temperature
d)
by adding 30 degrees to 35 degrees F (17 degrees C to 19 degrees C) to the desired condenser temperature
e)
Refrigeration MR20thEd 1479
42.
Which of the following motors has the highest torque?
a)
three phase
b)
shaded-pole
c)
permanent-split capacitor
d)
capacitor start induction run
e)
Electrical MR20thEd 15.2.2
43.
The absorption systems is different from the compression system in that uses
a)
heat energy
b)
mechanical energy
c)
high pressure vapor
d)
vapor compression
e)
Refrigeration MR20thEd 909
44.
There are various brazing low temperature silver alloys on the market, most have a 35% to 45% silver content. This type of material usually starts melting at what temperature?
a)
starts melting at 1,120 F and flows at 1,145 F
b)
starts melting at 1,140 F and flows at 1,160 F
c)
starts melting at 1.160 F and flows at 1,180 F
d)
starts melting at 1,180 F and flows at 1,195 F
e)
Refrigeration MR20thEd 8.5.2
45.
Identify the type of protection needed. -Equipment: gas-fired -Clearance wall requirement: 18 inches -Minimum side clearance desired: 6 inches Best protection would be:
a)
24-gauge sheet metal with no ventilated air space
b)
3 1/2-inch masonry wall with no ventilated air space
c)
1/2-inch noncombustible insulation board over 1-inch glass fiber with no air space
d)
1/2-inch noncombustible insulation board with ventilated air space
e)
Fuel Gas IFGC 2018 Table 308.2
46.
What is respiration?
a)
sweating on cooler walls
b)
air leaks at cooler doors
c)
heat evolved from life process of fruits and vegatables
d)
formation of moisture due to evaporator effect
e)
Refrigeration MR20thEd 1366
47.
When a roof-mounted furnace requires a working platform, the sides of the platform facing roof edge below shall be protected by a substantial railing having a minimum height of ___ inches.
a)
24
b)
30
c)
36
d)
42
e)
Fuel Gas IFGC 2018 306.5
48.
A residential bathroom needs to be provided with an intermittent exhaust. THE LEAST "cfm" allowed for this specific area is ___.
a)
100 cfm
b)
25 cfm
c)
50 cfm
d)
75 cfm
e)
Mechanical IMC 2018 Table 403.3 footnote f
49.
When a central furnace is installed under a floor and supported from above, what is the minimum clearance above finished grade required?
a)
3 inches
b)
4 inches
c)
5 inches
d)
6 inches
e)
Mechanical IMC 2018 306.4
50.
In an R-22 system, evaporator pressure is 60 pounds. What is the corresponding saturated refrigerant temperature?
a)
34 degrees F
b)
40 degrees F
c)
45 degrees F
d)
55 degrees F
e)
Refrigeration MR20thEd 1555
51.
International fuel gas code emphasizes that the test pressure in gas piping to be used shall be AT LEAST ___psig.
a)
20
b)
40
c)
3
d)
10
e)
Fuel Gas IFGC 2018 406.4.1
52.
When adjusting a thermostatic expansion valve, how much time should be allowed between adjustments?
a)
1 to 3 minutes
b)
4 to 9 minutes
c)
10 to 15 minutes
d)
16 to 20 minutes
e)
Refrigeration MR20thEd 1521
53.
Polybutylene pipe and tubing in hydronic systems must be installed in continuous lengths or must be joined by _____ in accordance to code.
a)
solvent cement
b)
compression fittings
c)
mechanically
d)
heat fusion
e)
Mechanical IMC 2018 1209.3.3
54.
On down flow units, a water-level monitoring device shall be installed inside the ____.
a)
auxiliary drain pan
b)
primary drain pan
c)
auxiliary drain line
d)
primary drain line.
e)
Mechanical IMC 2018 307.2.3.1
55.
According to Ohm's Law, to solve the current draw of a circuit, the correct formula would be which of the following?
a)
I=E/R
b)
E=I/R
c)
R=1/E
d)
I=R/E
e)
Refrigeration MR20thEd 12.1.3
56.
What condition does the automatic expansion valve maintain?
a)
constant pressure in the low side
b)
constant pressure in the condenser
c)
constant pressure in the high side
d)
constant temperature in the evaporator
e)
Refrigeration MR20thEd 20.5
57.
Drain pipe materials must be sizes according to the International Mechanical Code. What would be the required size of a condensate pipe that has a cooling capacity of 55 tons of refrigerant?
a)
1 1/16 inch
b)
1 1/8 inch
c)
1 1/4 inch
d)
1 3/4 inch
e)
Mechanical IMC 2018 307.2.2
58.
The difference between the pressure in a piping system and atmospheric pressure is measured in
a)
pounds per square inch gauge
b)
absolute pressure
c)
total pressure
d)
inches of vacuum
e)
Refrigeration MR20thEd 78
59.
Give details on how a natural gas piping tracer must be installed. It must:
a)
have the radius of bends not less than 20 times the inside diameter.
b)
have the pipe joints threaded and screwed together
c)
include a minimum 18 AWG insulated copper tracer
d)
be laid on a bed of pea gravel
e)
Fuel Gas IFGC 2018 404.17.3
60.
How is a fan motor connected electrically to the compressor (for an outdoor fan motor)?
a)
In parallel and controlled by refrigerant control.
b)
In parallel and controlled by thermostat.
c)
In series and controlled by refrigerant control.
d)
In series and controlled by thermostat.
e)
Refrigeration MR20thEd 15.5.2
61.
Commercial kitchen grease ducts shall be designed for the type of cooking appliance and hood served. If the installation calls for a Type 1 Hood, the grease duct must be a minimum thickness steel gage of ___.
a)
18 gage
b)
16 gage
c)
14 gage
d)
12 gage
e)
Mechanical IMC 2018 506.3.1.1
62.
Items such as ___ use Desiccants to get the job done.
a)
gauge glasses if combined with moisture indicators
b)
strainers
c)
driers
d)
moisture indicators
e)
Refrigeration RACT8thEd 651
63.
Choose the correct description for scroll compressors:
a)
There is less vibration than from a reciprocating compressor.
b)
Both scrolls remain stationary during operation.
c)
There are more moving parts than in reciprocating compressors.
d)
They are noisy.
e)
Refrigeration MR20thEd 18.2.3
64.
Which device is NOT considered a pressure relief valve?
a)
valve disk
b)
rupture disk
c)
fusible plug
d)
spring loaded valve
e)
Refrigeration MR20thEd 583
65.
A technician needs to replace refrigerant R-502 in a system. The refrigerant SHOULD NOT be replaced with ___.
a)
R-22.
b)
R-507A.
c)
R-407A.
d)
R-407B.
e)
Refrigeration MR20thEd 9.3.3
66.
According to the International Fuel Gas Code, ducts for combustion air shall not serve more than one ___.
a)
story
b)
residence
c)
appliance enclosure
d)
room
e)
Fuel Gas IFGC 2018 304.11
67.
When any Group 1 refrigerant, except CO2, is removed from a refrigerating system how shall it be discharged?
a)
to the atmosphere at an approved location
b)
from the high pressure side of the refrigerating system to the low pressure side
c)
into an approved shipping container
d)
into an empty disposable container
e)
Refrigeration MR20thEd ?
68.
A contractor was asked to drain piping from an air conditioning system. He needs to make sure this piping is not discharging:
a)
to a grassy area
b)
onto a street or an alley
c)
onto a flat roof
d)
into a french drain
e)
Mechanical IMC 2018 307.2.1
69.
A permanent electric outlet and light fixture controlled by a switch is required for which type installation?
a)
all warm air furnace installation
b)
installation in closed closets
c)
installation of warm air furnace in attics
d)
warm air furnace installations not located under the floor
e)
Mechanical IMC 2018 306.3.1
70.
Propane gas measured at the gas valve outlet should have a pressure of
a)
3.5 inches wc.
b)
8.0 inches wc.
c)
10.5 inches wc.
d)
13.0 inches wc.
e)
Refrigeration MR20thEd 1121
100 %
