Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.

  • 15
  • 25
  • 10
  • 20

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

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

3: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are

  • sight glass, weight, pressure, and frost line
  • Buss-eye, weight, pressure, and frost line
  • sight glass, weight, pressure, and dipstick
  • sight glass, weight, paper method, and frost line.

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

  • sugar
  • soil
  • sand
  • salt

5: What type of voltage causes the winding in a potential relay to open?

  • BEMF (Back Electro-Motive Force)
  • 24V control voltage from the thermostat
  • 120V line voltage
  • None of the above

6: In an A/C unit, dirty filters will cause

  • high discharge pressure
  • high suction pressur
  • low suction pressure
  • low oil pressure

7: R-11 has the greatest corrosive effect on

  • Bronze
  • Copper
  • Aluminum
  • Magnesium

8: Who approves containers for refrigerants?

  • D.O.T
  • E.P.A
  • D.O.E
  • D.O.D

9: The main cause of enacting the "no vending rule" of July 1st 1992 was

  • global warming potential
  • ozone depletion
  • both a & b
  • None of the above

10: How many gallons of water do you need per pound of ammonia?

  • 1
  • 50
  • 10
  • 100

11: R-12. R-22, and R-40 are considered Group I refrigerants.

  • True
  • False

12: One atmosphere equals

  • 29.4
  • 0 psig
  • 0 psia
  • 14.7

13: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.

  • 550
  • 350
  • 100
  • 50

14: A class B1 refrigerant is considered

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

15: Bubbles in the liquid line sight glass could be caused by

  • bad low pressure switch
  • overcharge of oil
  • plugged drier
  • leaking discharge valves in the compressor

16: A restaurant is classified as a

  • large mercantile occupancy
  • mixed occupancy
  • commercial occupancy
  • public assembly occupancy

17: R-22 is considered a(n)

  • HCFC
  • CFC
  • HFC
  • HCFCH

18: The difference between saturated liquid and saturated vapor is

  • pressure
  • heat
  • temperature
  • volume

19: The first step in mechanical refrigeration is

  • condensation
  • expansion
  • compression
  • evaporation

20: Capacity control on an absorption system is typically accomplished by varying the

  • speed of the condenser water circulator pump
  • rate at which heat is supplied to the generator
  • pressure setting on the system's rupture disc
  • speed of the chilled water circulatory pump

21: In a low temperature refrigeration system, the benefit of the system using P.A.G. oil is

  • it is hydroscopic
  • it traps moisture
  • viscosity
  • all of the above

22: Total heat of a substance is considered

  • sensible heat
  • enthalpy
  • specific heat
  • empathetical

23: Which is the lowest vacuum?

  • 5 psig
  • 5" hg
  • 10 psia
  • 1,000 Microns

24: What should never be used in pressure testing refrigeration systems?

  • Oxygen
  • Compressed air
  • Nitrogen
  • Both a and b

25: The evaporator is a device to

  • remove heat from the refrigeration system
  • absorb heat into the refrigeration system
  • store liquid refrigerant
  • Keep the compressor busy