Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Heat cannot of itself, pass from a

  • cold to a warmer body
  • warm to a colder body
  • state of hot energy to a state of cold energy
  • None of the above

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

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

3: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.

  • 7.25'
  • 9.00'
  • 8'4"
  • 7.00'

4: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?

  • Oil
  • Electricity
  • Air
  • Heat

5: Capacity control on an absorption system is typically accomplished by varying the

  • rate at which heat is supplied to the generator
  • speed of the condenser water circulator pump
  • speed of the chilled water circulatory pump
  • pressure setting on the system's rupture disc

6: Refrigeration piping before being buried shall be

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

7: A class B2 refrigerant is considered

  • toxic and somewhat flammable
  • non-toxic and highly flammable
  • toxic and non-flammable
  • non-toxic and non-flammable

8: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the

  • evaporator
  • outside the machinery room
  • compressor
  • boiler

9: Ammonia (NH3) is a group III refrigerant

  • True
  • False

10: Which has more turns in the windings: Start windings or Run windings?

  • Start windings
  • Run windings
  • They both have the exact same turns
  • Depends on the system and capacitor used

11: Megaohm meters can detect a ground in the

  • up to 10,000 ohms
  • up to 1,000,000 ohms
  • 10,000,000 ohms or higher
  • up to 1,000 ohms

12: A mercury bulb controller is not recommended for

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

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

  • Barometer
  • Anemomter
  • Vacuum gauge
  • Manometer

14: Capacitors are rated in

  • volt - amperes
  • megaohms
  • kelvins
  • micro-farads

15: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • UV or UR
  • UL and UM
  • UL and UR
  • UM or UL

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

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

17: The actual expansion curve of compression follows most nearly which one of the following curves?

  • Volume Temperature
  • Isothermal
  • Adiabatic
  • Pressure Temperature

18: A pressure relief should be located at least _______ from windows and doors.

  • 25'
  • 15'
  • 20'
  • 30'

19: one BTU equals

  • Pi
  • 12,000 hp
  • 31.4 hp
  • 3.41 hp

20: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?

  • 4%
  • 1%
  • 2%
  • 25%

21: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?

  • 746 watts
  • 5KW
  • 600 watts
  • 1000 watts

22: What type of voltage cause a potential relay to open?

  • 24 volt supply from the thermostat
  • 120 volt line voltage
  • Pick-up voltage
  • none of the above

23: A compressor in which the increase in vapor pressure is attained without changing the internal volume of the compression chamber is called

  • neutral chamber-type compressor
  • non-positive displacement compressor
  • negative displacement compressor
  • non-volumetric displacement compressor

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

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

25: What was the main reason for enacting the no venting rule of July 1, 1992?

  • Ozone depletion
  • Green house effect
  • Global warming potential
  • All of the above