Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is
start the comrpessor
reset the expansion valve
start the fan and circulating pump
reset the safety valve
2: Suction line oil traps should be installed when the condenser is
on the third floor roof and the evaporator is in the basement
in the basement and the evaporator is on the third floor
located outside the operates in temperatures below 35F
more than 100' away from the evaporator
3: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.
There isn't enough information to answer.
1250
2.5
2
4: What is Absolute Zero?
-400F
-460F
-640F
-773F
5: Crankcase heaters are energized
when the compressor is off
to prevent compressor freeze-up
while the compressor is running
to allow easy compressor start-up
6: What would be the classification for Stop & Shop grocery store?
Instituional
Place of assembly
Large mercantile
Industrial
7: Capacitors are rated in
megaohms
volt - amperes
micro-farads
kelvins
8: All electrical work done on refrigeration systems must comply with
Department of Energy
ASHREA-15 Section 9.2.1
OSHA
NEC and Massachusetts Modifications
9: What's the purpose of a megohmmeter?
To measure low to very low resistance values
To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
To measure very high resistances
None of the above
10: The oil separator is always inserted in the system
to prevent oil logging
where it can be easily serviced
in a cool spot
in the discharge line
11: What is the refrigerant dichlorodifluoromethane?
R-123
R-134A
R-22
R-12
12: The boiling point of a refrigerant is based on
Temperature
Heat content
a pressure-temperature relationship
None of the above.
13: A chiller entering and leaving temperature difference is?
5 degrees F
20 degrees F
10 degrees F
50 degrees F
14: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
ammonia
HCFC-123
CFC-11
Lithium bromide
15: NH3 is
R-718
ammonia
lithium bromide
R-508A
16: What is the leaving chilled water set point for water chiller systems?
38F
45F
66F
55F
17: Where is the high-side float located on a chiller system?
discharge line
liquid line
inside the chiller barrel
flash line
18: Methyl Chloride is a halogenated refrigerant and should not come in contact with
aluminum
zinc
magnesium
all of the above
19: What is the typical air conditioning operating pressures for 410A?
60 psi suction, 210 psi discharge
25 psi suction, 125 psi discharge
105 psi suction, 350 psi discharge
None of the above
20: What is an egress?
A code violation
A valve put on the low side of the system to prevent frosting
An entrance or exit
An escape route
21: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are
Buss-eye, weight, pressure, and frost line
sight glass, weight, pressure, and frost line
sight glass, weight, pressure, and dipstick
sight glass, weight, paper method, and frost line.
22: R-11 belongs to Group
B-3
A-1
B-1
A-2
23: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
the low-pressure side of the system
the high side of the system
the liquid receiver
both a and c are correct
24: The actual expansion curve of compression follows most nearly which one of the following curves?