Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What section of ASHRAE-15 governs pressure vessels?

  • Section 9 ASHRAE-15 ASME VIII unfired
  • Section 6 ASHRAE-34 ASME VIII unfired
  • OSHA
  • Section 7 ASHRAE-15 ASME VIII fired

2: Where can 50/50 solder be used on?

  • suction line
  • liquid line
  • discharge line
  • none of the above

3: Joints in piping for refrigeration containing parts must withstand temperatures of ___?

  • 600F
  • 800F
  • 1000F
  • 700F

4: Halogenated refrigerants cannot be used with what material?

  • Aluminum
  • Copper
  • Magnesium alloy
  • Stainless steel

5: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.

  • the atmosphere
  • a de-pressurized recovery tank with a silver top and yellow bottom
  • a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
  • All of the above

6: A high side float is a

  • float type valve that controls the amount of refrigerant stored in the receiver
  • float type valve that controls the crankcase oil level
  • metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
  • float type switch that stops the compressor when the pressure on the high side becomes too high

7: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.

  • 455 psig, 185 psig
  • 350 psig, 120 psig
  • 226 psig, 68 psig
  • 257 psig, 77 psig

8: A 24 volt transformer with a 240 volt primary can handle how many amps?

  • 10 amps
  • 24 amps
  • 20 amps
  • There isn't enough information to answer.

9: Machinery rooms must be vented to ______?

  • basement
  • outdoors
  • unoccupied spaces
  • neutralizing tank

10: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of

  • the aggregate of the high side and low side
  • the low side
  • the high side
  • 2.5 times the design pressure

11: A positive displacement compressor is

  • a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
  • where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
  • is a reciprocating type compressor with 2 or more pistons
  • a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber

12: Before you change the type of refrigerant in a refrigeration system, what three things must be done?

  • Place sign, check for leaks, and insulate suction line
  • Make sure its compatible, notify owner, and notify AHJ.
  • you can never change refrigerants
  • Nothing must be done

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

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

14: In a low temperature refrigeration system, the benefit of the system using P.A.G. oil is

  • it is hydroscopic
  • it traps moisture
  • viscosity
  • all of the above

15: While the system is operating, the discharge line should be

  • too hot to hold by hand
  • room temperature
  • 10-15F warmer than ambient
  • at the same temperature as the crankcase

16: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.

  • 2.0
  • 3.0
  • 5.5
  • 2.5

17: There can be no airflow from an occupied space through a machine room unless what?

  • System is high velocity
  • System is ducted and sealed
  • Duct is not located in the ceiling
  • None of the above.

18: What is specific heat?

  • measured heat
  • heat required to raise the temperature of 1lb of a substance 1 degree
  • the specific heat required to change the state of one cubic foot of air to steam
  • none of the above

19: An example of direct system is

  • rooftop unit
  • chiller
  • absorber
  • none of the above

20: What is R-22?

  • HFC
  • Chlorodifluoromethane
  • CCFCM
  • Chlorofluoromethane

21: Which of the following is NOT a positive displacement compressor?

  • screw
  • centrifugal
  • reciprocating
  • scroll

22: Low ambient controls are used when

  • always
  • economizers are used
  • when systems run all year round
  • on air conditioning systems only

23: What is used to check very low air pressures in air conditioning duct?

  • Manometer
  • Anemomter
  • Barometer
  • Vacuum gauge

24: In an electrical circuit, what is potential measured in?

  • Herys
  • Amps
  • Ohms
  • Volts

25: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?

  • CPR valve
  • EEV
  • Solenoid valve
  • EPR valve