Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is
drawing RLA and is running as it should
drawing LRA and is seized and should be replaced.
running hot
none of the above
2: Refrigeration piping before being buried shall be
leak tested
encased in pipe duct
pressure tested
All of the above
3: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the
load-side of the contactor in
24 volt secondary side of the Class 2 transformer to the thermostat
first disconnect in
breaker panel in
4: A halide torch is most useful with a freon compression system
to release a sticking valve
to sweat flanges on the refrigeration piping
to detect refrigeration leaks in piping joints
to remove from from TXV's and evaporator coils
5: What is the refrigerant chlorodifluoromethane?
R-134a
R-123
R-22
R-12
6: A machine room with a refrigerant system using ammonia shall
be provided with a continuously operated ventilation system
be considered a non-hazardous location in accordance with National Electrical code
have no flame producing apparatus permanently installed and operated
All of the above
7: Heat cannot of itself, pass from a
cold to a warmer body
warm to a colder body
state of hot energy to a state of cold energy
None of the above
8: All electrical work done on refrigeration systems must comply with
OSHA
ASHREA-15 Section 9.2.1
NEC and Massachusetts Modifications
Department of Energy
9: A declaration test is needed when the system contains more than
65 lbs
55 lbs
110 lbs
120 lbs
10: How do you find net oil pressure on a compressor?
discharge pressure - suction pressure
gross oil pressure - suction pressure
gross oil pressure - discharge pressure
all of the above
11: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)
58F
77F
70F
32F
12: The proper location for an oil separator is between the
compressor and condenser
receiver and metering device
condenser and receiver
evaporator and compressor
13: At higher altitudes, boiling temperatures
depends on the refrigerant
increase
are unaffected
decrease
14: Refrigerants shall be classified by
maximum permissible quantities of each group
color codes
toxicity and flammability
requirements for commercial, industrial, and residential occupancies
15: A single pole-double throw switch used how many wires excluding the ground wire?
five
two
four
three
16: What section governs pressure vessels?
Section ASHREA 34
Section 1 ASHREA 15 ASME fired
Section 8 ASHREA 15 ASME unfired
OSHA
17: What kind of material can't be used on the outlet of a relief valve?
Stainless Steel
Aluminum
Copper
PVC
18: Liquid line filter-driers on a 410A system must be rated for no less than
400 psig
200 psig
1000 psig
600 psig
19: In designing duct work, pressure and ______ need to be considered
length
CFM
duct sealant used
all of the above
20: In an A/C unit, dirty filters will cause
low oil pressure
high discharge pressure
high suction pressur
low suction pressure
21: What kind of system uses two different refrigerants in separate systems dependent on each other?
R-414B
Low pressure
Cascade
Simple
22: What is the leaving chilled water set point for water chiller systems?
66F
55F
38F
45F
23: How many refrigerant classifications are there for flammability?
1
2
3
7
24: Which refrigerant is lighter than air?
R-134a
R-717
R-123
R-11
25: Joints in refrigeration piping must be _____ before being covered?