Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: While water is evaporated in an evaporative condenser the impurities which were in the water are

  • accumulate in the sump water
  • blown to the atmosphere by the fan
  • washed out of the air by the spray pump
  • remain in the air

2: When air is ducted through a machine room that services occupied space, What must be done?

  • Flanged and gasketed
  • Welded and seamed.
  • Ducted and sealed
  • Insulated and cross broke

3: How many different groups of refrigerants are there?

  • 3
  • 15
  • 7
  • 11

4: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.

  • there is no Group B1 refrigerants
  • the same
  • higher
  • lower

5: Joints in refrigeration piping must be _____ before being covered?

  • Leak tested
  • Pressurized
  • Inspected
  • Insulated

6: Pressure is the equivalent of

  • force per unit area
  • area times force
  • force times area
  • force

7: A EPR valve is installed on what type of evaporators?

  • shell and tube evaporators
  • high-temperature evaporators
  • plate evaporators
  • low-temperature evaporators

8: The purpose of an accumulator is to

  • assure no liquid returns to the compressor
  • store excess refrigerant from the reciver
  • reduce friction loss to the flow of refrigerant
  • filter out impurities from the system

9: Bubbles in the liquid line sight glass could be caused by

  • plugged drier
  • leaking discharge valves in the compressor
  • overcharge of oil
  • bad low pressure switch

10: Refrigeration piping before being buried shall be

  • leak tested
  • encased in pipe duct
  • pressure tested
  • All of the above

11: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 33
  • 22
  • 18
  • 50

12: Adjusting the spring pressure on a TXV

  • makes no difference
  • changes superheat
  • changes subcooling
  • adjusts the bulb charge

13: How many opening forces operate a thermostatic expansion valve?

  • 1
  • 4
  • 3
  • 2

14: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code

  • over pressure protection as well as a temperature protection device
  • over pressure protection
  • Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
  • over pressure protection and a rupture disc

15: Sensible heat is the heat added to a substance to

  • change its state
  • raise its temperature
  • cause evaporation
  • freeze it

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

  • 1
  • 2.57
  • 3.00
  • 3.41

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

  • 18
  • 36
  • 48
  • 24

18: All low-pressure chillers use which type of compressor?

  • Reciprocating
  • Rotary
  • Scroll
  • Centrifugal

19: When an electronic bridge is in balance the bridge output will be

  • 1 volt
  • .01 volts
  • 15 volts
  • 0 volts

20: The freezing point of water at sea level is?

  • -10C
  • 32F
  • 0F
  • 32C

21: A mercury bulb controller is not recommended for

  • use where vibration is severe
  • line or low voltage use
  • line voltage use
  • low voltage use

22: If your suction line is warmer than the room temperature, this may indicate

  • a low charge
  • an over charge
  • plugged air filter
  • below normal superheat

23: What must be done to refrigerant pipes before being buried ?(8.10.4)

  • Classifed
  • Leak checked
  • Insulated and installed in a pipe duct (Encased)
  • Certified

24: On a large centrifugal system, what meters the flow to the evaporator?

  • High side float
  • Cap tube.
  • TXV
  • Low side float

25: 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
  • 50
  • 75
  • 100