Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: How many different groups of refrigerants are there?

  • 7
  • 15
  • 11
  • 3

2: When a refrigerating machinery room is used, the emergency procedures shall be posted

  • on a conspicuous card located near the compressor
  • outside the room, immediately adjacent to each door
  • on a conspicuous card located near the evaporator
  • inside the room, immediately adjacent to each door

3: What is the minimum size of the discharge pipe?

  • Same size as the outlet of the relief valve
  • One pipe size larger that the inlet of the relief valve
  • Depends on size of manifold
  • All of the above

4: A single pole-double throw switch uses how many wires?(excluding the ground)

  • 2
  • 5
  • 4
  • 3

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

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

6: Heat transferred by conduction from one body to another is done via:

  • gas
  • liquid
  • solid
  • All of the above

7: On a pumpdown system, the liquid-line solenoid is controlled by the

  • defrost timer
  • thermostat
  • low pressure switch
  • low-ambient controller

8: The solution that leaves the concentrator in an absorption chiller is referred to as the

  • strong solution
  • diluted solution
  • absorbed solution
  • weak solution

9: The measurement of heat in a particular substance is

  • enthalpy
  • sensible heat
  • latent heat
  • specific heat

10: An oil pressure safety switch should be set at

  • 10-15 psi above low side pressure
  • 5 to 10 psi below low side pressure
  • 5 to 10 psi above low side pressure
  • 10 to 15 psi below low side pressure

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

  • C-3
  • A-3
  • B-2
  • A-1

12: Ammonia is under what safety classification?

  • A3
  • B2
  • B1
  • B3

13: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the

  • load-side of the contactor in
  • breaker panel in
  • 24 volt secondary side of the Class 2 transformer to the thermostat
  • first disconnect in

14: In designing duct work, pressure and ______ need to be considered

  • length
  • CFM
  • duct sealant used
  • all of the above

15: B3 refrigerants are considered

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

16: A Category D fluid

  • is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
  • is when the design pressure does not exceed 150 psi
  • a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
  • Both a and b are correct

17: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant

  • shall have a pressure limiting device and a pressure relief valve installed
  • shall be inspected by the Boiler of Inspectors bi-annually
  • does not require a pressure-limiting device
  • shall have a pressure limiting device installed on the high side of the system

18: At higher altitudes, boiling temperatures

  • increase
  • are unaffected
  • depends on the refrigerant
  • decrease

19: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.

  • True
  • False

20: "E" represents _____ in the Watt's law formula.

  • watts
  • reactance
  • amperage
  • voltage

21: If the power element on an expansion valve should lose its charge, the valve would

  • Stay open
  • Under feed
  • Close
  • Over feed

22: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.

  • the atmosphere
  • a de-pressurized recovery tank with a silver top and yellow bottom
  • a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
  • All of the above

23: What type of relief valve is used on low pressure centrifugal compressor systems?

  • Spring-loaded relief valve
  • Rupture disc
  • Purge relief
  • None of the above

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

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

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

  • Anemomter
  • Barometer
  • Vacuum gauge
  • Manometer