Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A class B1 refrigerant is considered

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

2: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.

  • 48
  • 36
  • 18
  • 24

3: Three-phase motors have what type of windings?

  • three run windings
  • three run windings and 3 start windings
  • one start winding and one run winding.
  • three start windings

4: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested

  • annually
  • regularly
  • quarterly
  • bi-annually

5: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?

  • 24,000 BTU
  • 12,000 BTU
  • 144 BTU
  • 970 BTU

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

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

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

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

8: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?

  • it would cause the condenser to sweat
  • it would make the condenser less efficient
  • it would have no effect on the condenser
  • it would make the condenser more efficient

9: What would be the classification for Stop & Shop grocery store?

  • Large mercantile
  • Place of assembly
  • Industrial
  • Instituional

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

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

11: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?

  • centrifugal switch
  • duel-voltage switch
  • motor starter
  • printed circuit board (PCB)

12: An electronic bridge circuit is basically a

  • Wheatstone
  • high voltage circuit
  • suspension
  • 24 volt control circuit

13: No open flames are allowed in the machinery room unless?

  • Approved by the installing contractor
  • Approved by the authorized person
  • Only when combustion air is provided from outside of the machinery room
  • Never can be allowed

14: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of

  • moisture in the system
  • oil in evaporator
  • low head pressure
  • not enough oil in the system

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

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

16: Crankcase heaters are energized

  • while the compressor is running
  • to prevent compressor freeze-up
  • when the compressor is off
  • to allow easy compressor start-up

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

  • 3.415
  • 34.15
  • 16.64
  • 6.830

18: Excessive head pressure is often caused by

  • leaking reed valve on the discharge side
  • air cooled condenser is plugged
  • insufficient refrigerant
  • thermostat set too high

19: When is the only time you can leave a service container attached to a system?

  • Leaking system
  • Recovery
  • Charging
  • Both b and c

20: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.

  • 100%
  • 80%
  • 90%
  • 75%

21: Which is considered the more efficient condenser?

  • water cooled
  • air cooled
  • spray cooled
  • fan cooled

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: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?

  • Fan-like action
  • Nesting scrolls
  • Suction and discharge valves
  • Rotating vanes

24: A Lithium-bromide system is an absorption system that

  • uses salts as an absorbent and lithium bromide as a refrigerant
  • uses ammonia as a refrigerant and lithium bromide as an absorbent
  • uses water as a refrigerant and lithium bromide as an absorbent
  • uses water as a absorbent and lithium bromide as a refrigerant

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

  • To chemical neutralizing tank only
  • Underground, into drain, into mechanical room
  • Atmosphere, Tank containing water, where the AHJ indicates.
  • None of the above.