Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: Indirect systems using Group II refrigerants
shall be used for mechanical equipment only
shall have all refrigerant containing parts except piping, installed in a Class T machine room
shall be used in refrigeration system in excess of 1,000 lbs
shall be used in refrigeration system less than 1,000 lbs
2: On a large centrifugal system, what meters the flow to the evaporator?
Low side float
High side float
Cap tube.
TXV
3: What pipe can not be used for refrigeration?
L
K
N
M
4: What must be done if refrigeration lines pass through a concrete floor?
moisture barrier
installed through a pipe casing
leak checked
insulated
5: If a low-pressure chiller has a low-side leak, which of the following will most likely result?
High head pressure and low suction pressure
Low suction pressure and low discharge pressure
High suction pressure and high discharge pressure.
Low head pressure and high suction pressure
6: The reversing valve is commonly used
when the code requires a check valve
on multiple compressor systems
on all heat pumps
on commercial system that involve two different temperatures
7: Two capacitors are wired in parallel. One capacitor has a value of 15uf. The other has a value of 25uf. What is the total value supplied?
20 uf
40 uf
25 uf
15 uf
8: Where is the high-side float located on a chiller system?
flash line
inside the chiller barrel
discharge line
liquid line
9: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of
oil in evaporator
moisture in the system
not enough oil in the system
low head pressure
10: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
Flush with RX-11
Flush with ammonia
Flush with R-11
Flush with R-718
11: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
institutional occupancy
commercial occupancy
mixed occupancy
public assembly occupancy
12: Institutional occupancy is
a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
None of the above
13: When is the only time you can leave a service container attached to a system?
Leaking system
Recovery
Charging
Both b and c
14: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.
50
24
75
100
15: When can 50/50 solder be used?
in the low side
in the high side
liquid and suction lines
none of the above.
16: What refrigerant doesn't have to be classifted?
R-134a
R-717
R-711
R-718
17: Refrigeration piping before being buried shall be
leak tested
encased in pipe duct
pressure tested
All of the above
18: An azeotropic refrigerant is
a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
none of the above
19: R-22 is classified as a ____ refrigerant on the safety matrix.
B-2
B-1
A-2
A-1
20: 1 HP = ____ Watts?
746
11,239
3.1416
3,412
21: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?
5 amps
15 amps
10 amps
20 amps
22: The measurement of heat in a particular substance is
enthalpy
sensible heat
specific heat
latent heat
23: Industrial occupancy is
a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.