Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: Pressure vessels with an internal volume of 3 cubic feet or more
do not need pressure relief protection
shall use pressure relief devices or fusible plugs
shall use fusible plugs
shall use pressure relief devices
2: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
12,000 BTU
24,000 BTU
970 BTU
144 BTU
3: How many different groups of refrigerants are there?
7
11
15
3
4: Booster compressors connect to the ____ side of the compressor
oil side
liquid
vapor
low side
5: Where are the three places that the discharge from an ammonia relief valve be piped?
To chemical neutralizing tank only
Underground, into drain, into mechanical room
Atmosphere, Tank containing water, where the AHJ indicates.
None of the above.
6: How many square inches per square foot?
64
24
144
98
7: A micron is
a larger unit of measurement than Hg
one millonths of a micrometer
one millonths of a centimeter
one thousandths of a millimeter
8: Class T machine room
shall include closets used for setting equipment
shall have refrigerant leak detecting systems installed inside and outside the room
has no flame producing apparatus permanently installed
shall have remote controls to stop the action of the refrigerant compressor
9: What is the typical air conditioning operating pressures for R-22?
60 psi suction 210 psi discharge
25 psi suction 125 psi discharge
105 psi suction 340 psi discharge
None of the above
10: What refrigerant doesn't have to be classified?
R-717
R-134A
R-718
R-422A
11: A single pole-double throw switch used how many wires excluding the ground wire?
four
three
two
five
12: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
ball valves
gate or globe valves
king valves
companion or block valves
13: An air conditioning system rated for 36,000 BTU's is equivalent to
two tons of cooling
one ton of cooling
12,000 tons of cooling
three tons of cooling
14: Pi equals approximately
3.14
3.41
746
12,000
15: What is the minimum size of the discharge pipe?
Same size as the outlet of the relief valve
One pipe size larger that the inlet of the relief valve
Depends on size of manifold
All of the above
16: A run capacitor is wired in series with the _____ windings.
start
run
start capacitor
common
17: When should a relief valve start to function?
10 psi before it's set pressure
At it's set pressure
Two times it's working pressure
Before the purge station discharges
18: one BTU equals
3.41 hp
Pi
12,000 hp
31.4 hp
19: What would be the classification of a prison?
Institutional
Large mercantile
Place of assembly
Industrial
20: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
R-22
R-12
R-113
R-11
21: Three-phase motors have what type of windings?
one start winding and one run winding.
three start windings
three run windings
three run windings and 3 start windings
22: If the power element of an expansion valve should lose its charge the valve would
go open
go closed
underfeed the evaporator
overfeed the evaporator
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.