Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A hissing noise at the expansion valve is a good indication that

  • gas is passing thru it
  • nothing is passing thru
  • liquid is passing thru it
  • expansion valve is oversized

2: If a purge unit fails on a low pressure chiller, what are the symptoms?

  • low pressure chillers do not have purge units
  • high head pressure
  • increased capacity
  • low suction pressure

3: An example of direct system is

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

4: What type refrigerant is NOT ozone depleting?

  • HFC
  • CFC
  • Halon
  • HCFC

5: Color is important in oil because

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

6: 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

7: Institutional occupancy is

  • a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
  • a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
  • a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
  • None of the above

8: A VRF system is a direct system

  • true
  • false

9: R-22 falls under which safety classification?

  • B-1
  • A-2
  • A-1
  • B-2

10: What is the refrigerant dichlorodifluoromethane?

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

11: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of

  • the ASME Boiler and Pressure Vessel Code
  • Section 11.3.1.5 ASHRAE 15 Standard
  • the ANSI Standard 10.7.2
  • both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5

12: An air conditioning system rated for 36,000 BTU's is equivalent to

  • 12,000 tons of cooling
  • three tons of cooling
  • two tons of cooling
  • one ton of cooling

13: Name a reason that does not cause reduced condenser air quantity

  • High ambient temperature
  • Prevailing winds
  • Dirty fan blades
  • Dirty Coil

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

  • voltmeter
  • tape measure
  • meg ohmmeter
  • ammeter

15: The location of a thermal bulb of a TXV affects

  • the amount of liquid returning to the compressor
  • subcooling
  • the amount of liquid in the condenser.
  • the amount of liquid refrigerant in the evaporator

16: Pressure vessels with an internal volume of 3 cubic feet or more

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

17: What would be the classification of a church?

  • Institutional
  • Industrial
  • Large mercantile
  • Place of assembly

18: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered

  • institutional occupancy
  • commercial occupancy
  • mixed occupancy
  • public assembly occupancy

19: 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.

  • 100
  • 75
  • 24
  • 50

20: The purpose of a receiver is

  • a vessel to store refrigerant outside the system
  • to increase the capacity that the system can hold
  • to use a a later date
  • all of the above

21: R-11 has the greatest corrosive effect on

  • Bronze
  • Copper
  • Magnesium
  • Aluminum

22: How many square inches per square foot?

  • 24
  • 98
  • 64
  • 144

23: Doors communicating with outside from a mechanical room must be?

  • Self-closing, approved, fire door
  • Steel, approved, weather-stripped
  • Self-closing, wooden, fire door
  • Self-closing, aligned, fire door

24: Can you use Ammonia in industrial applications?

  • Yes, Under certain condidtions
  • No, never
  • Yes, always
  • When mixed with R-718

25: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.

  • 2.5
  • 1250
  • There isn't enough information to answer.
  • 2