Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
2
3
1
5
2: What is the leaving chilled water set point for water chiller systems?
38F
66F
45F
55F
3: A direct system
is one which encloses a separate body of evaporative refrigerant
is a self-contained complete factory made and tested system
is where the refrigerant comes in contact with the space refrigerated
is on where brine is cooled & circulated to the space refrigerated
4: If the suction pressure is low and the evaporator temperature high, the cause will be a?
overcharged
compressor suction valve stuck open
too small evaporator
starved evaporator
5: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
R-113
R-11
R-12
R-22
6: The formula for Pure Power in a resistance circuit is
Kw = volts X amps
Watts X power factor
Watts = volts X amps
Watts X amps.
7: All low-pressure chillers use which type of compressor?
Reciprocating
Rotary
Centrifugal
Scroll
8: 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.
HCFC-123
Lithium bromide
CFC-11
ammonia
9: What is the minimum height refrigeration piping should be placed against walls?
6'
72"
7.25'
Ceiling height
10: How many opening forces operate a thermostatic expansion valve?
1
2
3
4
11: 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.
24
75
50
100
12: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
regularly
bi-annually
quarterly
annually
13: Which refrigerant(s) is an HFC?
R-22
R-410A
R-502
All of the above
14: The proper location for an oil separator is between the
evaporator and compressor
condenser and receiver
compressor and condenser
receiver and metering device
15: How are safety controls wired in a circuit?
Parallel
Series
Either series or parallel
Series/parallel
16: 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.
Both a and b are correct
17: What is a high-side float?
Located in the liquid line entering the evaporator, so when the refrigerant level is higher in the liquid line than the evaporator, the float rises to allow more refrigerant flow into the evaporator
An electronic-type metering device that contains a float assembly within the device which can accurately meter refrigerant into the evaporator as the load varies
Located in the liquid line entering the evaporator, is a float-type metering device that rises to reduce refrigerant flow when the liquid refrigerant level rises in the high side of the chiller
Located in the evaporator, is a float-type metering device that rises to reduce refrigerant flow when the liquid refrigerant level rises in the low side of the chiller
18: What does an anemometer measure?
amperage
voltage
temperature
velocity
19: "I" represents _______ in the Watt's law formula.
amperage
reactance
watts
voltage
20: All machine rooms must be outfitted with a detector that _______?
activates an audible alarm
activates a visual alarm
starts the ventilation system
All of the above
21: What refrigerant has zero ozone depletion
HFC
CFC
HCFC
None of the above
22: What chemical in the refrigerant set off the leak detection alarm?
Fluorine
Chlorine
Both A and B
none of the above
23: If a halide torch is used for leak detection, what color is the flame if it detects a leak?