Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Which oil is hydoscopic?

  • polyolester
  • mineral
  • animal
  • SW30

2: What type of pressure relief device is used on a CO2 system?

  • Fusible plug
  • Glove valve
  • Rupture disk
  • Gate valve

3: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)

  • 77F
  • 70F
  • 58F
  • 32F

4: Class T machine room

  • shall have refrigerant leak detecting systems installed inside and outside the room
  • shall include closets used for setting equipment
  • has no flame producing apparatus permanently installed
  • shall have remote controls to stop the action of the refrigerant compressor

5: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.

  • 1
  • 2
  • 5
  • 3

6: Which of the following types of oils are hygroscopic?

  • polyolester (POE)
  • polyalkylene glycol (PAG)
  • naphthene mineral
  • both a and b

7: The amount of heat required to raise the temperature of 1 lb of water 1F is?

  • 1 Therm
  • 1 BTU
  • 1 Kelvin
  • The rate of conduction

8: Methyl Chloride is a halogenated refrigerant and should not come in contact with

  • aluminum
  • zinc
  • magnesium
  • all of the above

9: Refrigeration piping before being buried shall be

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

10: The outer portion of shell of the compressor used on low-pressure chillers is called the

  • suction
  • nozzle
  • volute
  • baffle

11: What is Trichlorotrifluoromethane?

  • R-13
  • R-113
  • R-11
  • R-12

12: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to

  • receive the pumpdown charge
  • release the charge when the pressure exceeds 310 psig or higher
  • Pumpdown procedures are not allowed with systems containing liquid recievers
  • hold up to 110% of the pumpdown charge

13: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.

  • 18
  • 24
  • 10
  • 15

14: What instrument is used to measure very high resistance?

  • voltmeter
  • meg ohmmeter
  • ammeter
  • tape measure

15: The reversing valve is commonly used

  • on multiple compressor systems
  • on commercial system that involve two different temperatures
  • when the code requires a check valve
  • on all heat pumps

16: The proper location for an oil separator is between the

  • compressor and condenser
  • receiver and metering device
  • evaporator and compressor
  • condenser and receiver

17: What chemical in the refrigerant set off the leak detection alarm?

  • Fluorine
  • Chlorine
  • Both A and B
  • none of the above

18: Mercury was used in thermometers primarily because it

  • never freezes
  • expands uniformly
  • was inexpensive
  • vaporizes at very high temperatures

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

  • 200
  • 330
  • 150
  • 100

20: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.

  • True
  • False

21: What is the temperature that a liquid and a vapor can exist in equilibrium called?

  • Saturated temperature
  • Critical temperature
  • Wet bulb temperature
  • Dry bulb temperature

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

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

23: Three-phase motors have what type of windings?

  • three start windings
  • one start winding and one run winding.
  • three run windings
  • three run windings and 3 start windings

24: Relief valves are rated in

  • gallons of water per minute
  • gallons of water per hour
  • pounds of air per minute
  • pounds of air per hour

25: What is the refrigerant dichlorodifluoromethane?

  • R-22
  • R-12
  • R-123
  • R-134A