Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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?

  • red
  • green
  • blue
  • orange

24: A VRF system is a direct system

  • true
  • false

25: Brazed joints melt at temperatures above

  • 500F
  • 1,000F
  • 800F
  • 1,200F