Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What type of relief valve is used on a CO2 system?

  • rupture disc
  • glove disc
  • gate valve
  • fusible plug

2: How many square inches per square foot?

  • 24
  • 98
  • 144
  • 64

3: R-11 has the greatest corrosive effect on

  • Bronze
  • Magnesium
  • Copper
  • Aluminum

4: Whoever owns/uses a refrigeration or air conditioning system covered by this code

  • must notify the Department of Public Safety prior to starting the system
  • shall be licensed by the Commonwealth of Massachusetts according to CMR 522
  • shall make application for inspections to the Chief of Inspectors
  • None of the above

5: Color is important in oil because

  • it makes sight glasses easy to read
  • allows you to see into crankcase
  • can tell us something about the refining of oil
  • it indicates the viscoisty.

6: Volts x amps equals

  • Impedance
  • Inductance
  • Ohms Law
  • Watts

7: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?

  • 1,000
  • 100,000
  • 100
  • 10,000

8: What does “ultimate strength” mean?

  • Design strength of the vessel or piping in a refrigeration system
  • Stress at which rupture will occur
  • Highest or design pressure allowed inside a machinery room
  • None of the above

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

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

10: The gauge thickness required on a CO2 tank construction is

  • 5/16"
  • 1/8"
  • 1/16"
  • 3/32"

11: What refrigerant doesn't have to be classified?

  • R-717
  • R-718
  • R-134A
  • R-422A

12: If an oil’s floc point is too high, which of the following could occur?

  • compressor burn out
  • high suction pressure
  • plugged expansion valve
  • low head pressure

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

  • ammeter
  • meg ohmmeter
  • voltmeter
  • tape measure

14: What is the refrigerant dichlorodifluoromethane?

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

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

  • 70F
  • 58F
  • 32F
  • 77F

16: A single pole-double throw switch uses how many wires?(excluding the ground)

  • 3
  • 2
  • 4
  • 5

17: It takes how many BTU/hr to melt one pound of ice at 32F

  • 212
  • 144
  • 970
  • 180

18: What's the purpose of a megohmmeter?

  • To measure low to very low resistance values
  • To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
  • To measure very high resistances
  • None of the above

19: What is the boiling point of refrigerant governed by?

  • Compressor RPM's
  • P&T relationship
  • Evaporator temperature
  • Condenser sub-cooling

20: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.

  • 2.5, 2.5
  • 6.6, 6.6
  • 2.5, 3.0
  • 3.0, 3.5

21: It is permissible to use a single-pole switch on a 2 HP motor running at 240 volts as long as the switch is rated for at least 2x FLA.

  • True
  • False

22: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.

  • 75%
  • 90%
  • 99%
  • 80%

23: _____ alloys shall not be used in contact with an halogenated refrigerants.

  • Nickel
  • Copper
  • Zinc
  • Magnesium

24: One watt of electrical energy in a resistive heater will provide _____ BTU/hr

  • 16.64
  • 6.830
  • 3.415
  • 34.15

25: 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