Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.

  • 1.2
  • 1
  • 2.2
  • 1.5

2: If the spring is adjusted to increase the superheat, this new setting will

  • allow more liquid into the evaporator
  • lengthen the frost line
  • have no effect on the frost line
  • shorten the frost line

3: Where must a refrigeration contractor's license number be displayed?

  • Trucks, license plates, and uniforms
  • Trucks, invoices, and advertising
  • Uniforms, checks, and invoices.
  • Truck, office, every job, and on all equipment

4: An example of direct system is

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

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

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

6: Which of the following most closely represents the concentration of Li-Br in a absorption system?

  • 40% Li-Br, 60% tap water
  • 50% Li-Br, 50% tap water
  • 40% Li-Br, 60% distilled water
  • 60% Li-Br, 40% distilled water

7: What is the purpose of a surge capacitor on a contactor?

  • to balance the sine waves
  • to keep the contactor pulled in
  • to protect low voltage equipment
  • to provide smoother start/stops

8: 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

9: Copper and its alloys shall not be used with ammonia

  • True
  • False

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

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

11: 1 HP = ____ Watts?

  • 3,412
  • 746
  • 11,239
  • 3.1416

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

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

13: Lithium-bromide, Li-Br, is best characterized as a

  • sand
  • salt
  • sugar
  • soil

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

  • Psychrometer
  • anemometer
  • refractometer
  • hydrometer

15: A class A3 refrigerant is considered

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

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

  • 100%
  • 90%
  • 75%
  • 80%

17: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is

  • run voltage
  • lift voltage
  • boost voltage
  • pick-up voltage

18: Transformers are rated in

  • volts
  • amps
  • volts-ohms
  • volt-amps

19: Watt's Law indicates Volts X Amps = _________.

  • Ohms
  • Current
  • Watts
  • Resistance

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

  • Oil
  • Electricity
  • Air
  • Heat

21: A class B2 refrigerant is considered

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

22: 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

23: What is the minimum height refrigeration piping should be placed against walls?

  • 6'
  • Ceiling height
  • 72"
  • 7.25'

24: Two systems using separate refrigerants that are superimposed upon one another is called

  • cascade
  • booster
  • indirect
  • single stage

25: A run capacitor is wired in series with the _____ windings.

  • start
  • common
  • run
  • start capacitor