Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: Pressure relief valves shall be marked with the data from
Section IV Division of the ASME Boiler & Pressure Code
Section XIII Division of the ASME Boiler & Pressure Code
Section I Division VIII of ASME Boiler & Pressure Code
Section VIII Division of the ASME Boiler & Pressure Code
2: A restaurant is classified as a
commercial occupancy
public assembly occupancy
large mercantile occupancy
mixed occupancy
3: The two basic types of evaporators are
direct expansion and plate
finned and plate
flooded and direct expansion
prime surface and finned
4: 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
5: R-12. R-22, and R-40 are considered Group I refrigerants.
True
False
6: Crankcase heaters are energized
while the compressor is running
to prevent compressor freeze-up
to allow easy compressor start-up
when the compressor is off
7: What type refrigerant is NOT ozone depleting?
HFC
CFC
Halon
HCFC
8: What is NOT a positive displacement compressor.
Rotary
Scroll
Reciprocating
Centrifugal
9: Name three things that must be done when changing refrigeration lubricant?
Place sign, check for leaks, insulate
Nothing must be done
You can't change lubricants.
Make sure it's compatible, notify owner, notify AHJ
10: Trichlorofluoromethane is the name of what refrigerant?
R-11
R-12
R-113
R-502
11: How far from the window does a relief valve need to be according to ASHRAE-15?
At least 30'
At least 40'
There is no minimum for relief valve and windows.
At least 20'
12: Refrigeration piping before being buried shall be
leak tested
encased in pipe duct
pressure tested
All of the above
13: Humidity can be sensed with
thermometer
human hair
pressure bellows
bimetal
14: Control systems can be classified by
tonnage of system
economy of operation
safety
source of power
15: Suction valve unloaders afford an effective means of
evaporator control
refrigerant control
capacity control
superheat control
16: On a 460V motor, what is he MAXIMUM voltage that can be safely applied to it?
506v
550v
660v
None of the above
17: 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.
100
75
24
50
18: A start capacitor is wired in _____ with the start windings.
series-parallel
parallel
junction
series
19: The instrument used to measure the specific gravity of absorption chiller solutions is the
refractometer
anemometer
hydrometer
Psychrometer
20: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
1,000
330
6.6
110
21: Methyl Chloride is a halogenated refrigerant and should not come in contact with
aluminum
zinc
magnesium
all of the above
22: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
“U” or “UM”
“UV”
“UM” and “UV”
“UL”
23: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.