Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: An example of an "Expendable Refrigerant" is

  • lithium bromide
  • liquid nitrogen
  • liquid oxygen
  • ammonia

2: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?

  • 1%
  • 4%
  • 2%
  • 25%

3: How much refrigerant can be stored in a mechanical room outside of the system?

  • 100
  • 330
  • 200
  • 150

4: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?

  • R-113
  • R-11
  • R-12
  • R-22

5: A normal operating evaporator temperature of R-22 for air conditioning is typically

  • 32F
  • 45F
  • 58F
  • 55F

6: Pressure vessels with an internal volume of 3 cubic feet or less

  • shall use pressure relief devices
  • shall use fusible plugs
  • shall use pressure relief devices or fusible plugs
  • do not need pressure relief protection

7: The main cause of enacting the "no vending rule" of July 1st 1992 was

  • global warming potential
  • ozone depletion
  • both a & b
  • None of the above

8: How many BTU's is produced by one watt of energy

  • 3.41
  • 2.57
  • 1
  • 3.00

9: R-11 belongs to Group

  • B-1
  • B-3
  • A-1
  • A-2

10: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the

  • low side of the system
  • high side float assembly
  • cap tube
  • none of the above

11: A capacitor in series with the start windings will do what?

  • Nothing
  • Decrease the RLA to within 10% of its rating
  • Increase starting torque
  • Increase run efficiency by 10% of its rating

12: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.

  • 48
  • 36
  • 24
  • 18

13: A professional or office building would be considered what type of occupancy?

  • mercantile
  • business
  • commercial
  • public assembly

14: Pressure limiting devices are not required for systems containing less then ________ refrigerants.

  • 6.6 lbs
  • 13.9 lbs
  • 22 lbs
  • 44 lbs

15: How many forces operate a thermostatic expansion valve?

  • 4
  • 3
  • 1
  • 2

16: 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

17: Single compound Refrigerants are classified by what two criteria?

  • Flammability and toxicity
  • Weight and color
  • Temperature range and hazardousness
  • Flammability and temperature range

18: What refrigerant were phased out in 2004?

  • R-12
  • R-11
  • R-134a
  • R-22

19: 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

20: A plug containing an alloy that will melt at a specific temperature to relief pressure is a

  • relief plug
  • rupture plug
  • fusion plug
  • fusible plug

21: In designing duct work, pressure and ______ need to be considered

  • length
  • CFM
  • duct sealant used
  • all of the above

22: What is potential measured in?

  • Henrys
  • Volts
  • Amps
  • Ohms

23: Which refrigerant class listed below is the most flammable?

  • A-1
  • A-3
  • C-3
  • B-2

24: Which occupancy can ammonia be used in?

  • industrial
  • depends on the quantity of freon
  • commercial
  • redifential

25: What is NOT a positive displacement compressor.

  • Centrifugal
  • Reciprocating
  • Scroll
  • Rotary