Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A low oil switch is typically

  • automatic reset
  • manual reset
  • time-delay auto reset
  • non used on semi-hermetic compressors over 10 ton capacity

2: A positive displacement compressor is

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

3: Where are the three places that the discharge from an ammonia relief valve be piped?

  • atmosphere, tank containing water, where the A.H.J. indicates
  • underground, into drain, into mechanical room
  • to chemical neutralizing tank only
  • none of the above

4: A mercury bulb controller is not recommended for

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

5: Pressure is equivalent of

  • Force
  • Force / Area
  • Area X Force
  • Force X Area

6: When can recovered refrigerants be reused?

  • They can't
  • Only when used in original owner's equipment
  • Only if used in 30 days of recovery
  • None of the above

7: Pressure vessels nameplate markings must be compliant with the

  • ASHRAE 34 Standards
  • CMR-588 & CMR-528
  • ASME Boiler and Pressure Vessel Code
  • All of the Above

8: The instrument used to measure the specific gravity of absorption chiller solutions is the

  • anemometer
  • refractometer
  • Psychrometer
  • hydrometer

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

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

10: When energized, a normally open relay will be

  • noisy
  • depends on the type and class of the relay
  • open
  • closed

11: If the power element of an expansion valve should lose its charge the valve would

  • go open
  • underfeed the evaporator
  • go closed
  • overfeed the evaporator

12: Which refrigerant class listed below is the most flammable?

  • C3
  • A2
  • B2
  • A3

13: 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

14: A capacitor in series with the start windings will do what?

  • Increase starting torque
  • Nothing
  • Decrease the RLA to within 10% of its rating
  • Increase run efficiency by 10% of its rating

15: 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

16: What is a megaohm meter?

  • An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
  • An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
  • An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
  • Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.

17: Pressure vessels with an internal volume of 10 cubic feet or more

  • shall use pressure relief devices or fusible plugs
  • shall use rupture discs or duel pressure relief valves
  • shall use fusible plugs
  • shall use pressure relief devices

18: Class A refrigerants are considered

  • toxic
  • non-flammable
  • non-toxic
  • flammable

19: The discharge relief valve is located (9.4.6)

  • between the compressor and the stop valve
  • on top of the condensor
  • between the compressor and oil separator
  • between the compressor and reciever

20: On a ammonia compressor, the pressure of a forced fed oil pump is changed by varying the

  • opening at the pump inlet
  • cooling temperature set-point
  • opening at the pump outlet
  • adjustment of the spring tension of the TXV

21: The density of a gas refers to

  • cubic feet per pound
  • pounds per absolute pressure
  • pounds per cubic foot
  • pounds per square foot

22: 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

23: The oil separator is always inserted in the system

  • where it can be easily serviced
  • to prevent oil logging
  • in a cool spot
  • in the discharge line

24: How are refrigerant blends classified?

  • Based on best case Fractionation
  • Based on worst case fractionation
  • Blends don't have to be classified
  • Based on the oil used

25: 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.