Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A High-Probablity system

  • is such that a leak of refrigerant from failed connections will enter the unoccupied space
  • is such that a leak of refrigerant from failed connections will enter the occupied space
  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is a system highly likely to leak from a failed connection or component of such system

2: When using nitrogen for brazing, the pressure should be:

  • Very low
  • 125 psig
  • 50-100 psig
  • Slightly below atmospheric

3: Fusible plugs must have what marked on them?

  • Melting temperature in F
  • Melting temperature in C
  • Opening pressure
  • All of the above

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

  • B2
  • A3
  • A2
  • C3

5: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.

  • 100
  • 90
  • 80
  • 110

6: What type of copper is not permitted on refrigeration systems?

  • Type M
  • Type N
  • Type L
  • Type K

7: Which of the following are considered inorganic refrigerants?

  • R-717 and R-718
  • 410A and R-407C
  • R-500 and R-502
  • None of the above

8: Electricity involves the movement of electrons in atoms

  • True
  • False

9: What do you need to do when you install a new system?

  • Add refrigerant
  • Insulate the suction line before you take a superheat reading
  • Have it inspected
  • Document the superheat and subcooling reading

10: Booster compressors, pump refrigerant into the

  • receiver
  • low side of the primary compressor
  • heat & plate heat exchanges
  • high side of the secondary compressor

11: What is used to check very low pressure?

  • Velometer
  • Hygrometer
  • Manometer
  • Hydrometer

12: What kind of system uses two different refrigerants in separate systems dependent on each other?

  • Simple
  • Cascade
  • Low pressure
  • R-414B

13: The measurement of heat in a particular substance is

  • specific heat
  • latent heat
  • sensible heat
  • enthalpy

14: How are safety controls wired in a circuit?

  • Either series or parallel
  • Parallel
  • Series
  • Series/parallel

15: High pressure controls should be set no higher than

  • 10% of set point
  • 90% of set point
  • 25% of set point
  • 80% of set point

16: What type of refrigerants are NOT flammable?

  • CHC
  • HFC
  • HCFC
  • All of the above

17: How many refrigerant classifications are there for toxicity?

  • 5
  • 1
  • 2
  • 3

18: Crankcase heaters are energized

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

19: What is an example of institutional occupancy?

  • Football stadium
  • Shopping mall
  • Dorms
  • Hospital

20: What would be the classification of a prison?

  • Institutional
  • Industrial
  • Place of assembly
  • Large mercantile

21: By using nitrogen within a pipe during brazing operation,

  • Discoloration is prevented
  • Copper oxide formation is prevented
  • Exterior scale formation is minimized
  • The explosion hazard is confined

22: Ammonia is under what safety classification?

  • A3
  • B2
  • B1
  • B3

23: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants

  • lower
  • the same
  • higher
  • there is no Group B1 refrigerants

24: The heat picked up in the evaporator must equal to

  • the heat giving by the condenser
  • the heat of compression
  • the heat lost by the medium being cooled
  • the heat gained by the condenser

25: What are the three components of a transformer?

  • Primary coil, secondary coil, and copper contacts
  • Primary coil, secondary coil, and core
  • Contacts, secondary coil, and core
  • Primary core, secondary coil, and high and low voltage connectors.