Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What does safe access mean?

  • OSHA approved
  • Locked doors
  • Well-lit exit signs
  • A clear unobstructed path to the equipment and controls

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

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

3: When air is ducted through a machine room that services occupied space, What must be done?

  • Insulated and cross broke
  • Flanged and gasketed
  • Welded and seamed.
  • Ducted and sealed

4: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.

  • 15
  • 20
  • 50
  • 75

5: The discharge relief valve is located (9.4.6)

  • between the compressor and reciever
  • between the compressor and the stop valve
  • on top of the condensor
  • between the compressor and oil separator

6: A cross charged power element on an expansion valve would normally be used in what temperature range?

  • -40F to 0F
  • -100F to -40F
  • 0F-38F
  • 30F to 50F

7: What section governs pressure vessels?

  • Section ASHREA 34
  • Section 1 ASHREA 15 ASME fired
  • Section 8 ASHREA 15 ASME unfired
  • OSHA

8: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.

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

9: How are refrigerant blends classified?

  • Blends don't have to be classified
  • Based on worst case fractionation
  • Based on best case Fractionation
  • Based on the oil used

10: The solution that is pumped into the concentrator in an absorption chiller is referred to as the

  • weak solution
  • strong solution
  • concentrated solution
  • absorbed solution

11: Class T machine room

  • shall have remote controls to stop the action of the refrigerant compressor
  • shall include closets used for setting equipment
  • shall have refrigerant leak detecting systems installed inside and outside the room
  • has no flame producing apparatus permanently installed

12: Name a reason that does not cause reduced condenser air quantity

  • Dirty fan blades
  • High ambient temperature
  • Prevailing winds
  • Dirty Coil

13: Dew point is

  • the temperature below which water vapor in the air will start to evaporate
  • the temperature above which water vapor in the air will start to condense
  • the temperature of air of 50% RH
  • the temperature below which water vapor in the air will start to condense

14: While water is evaporated in an evaporative condenser the impurities which were in the water are

  • accumulate in the sump water
  • remain in the air
  • washed out of the air by the spray pump
  • blown to the atmosphere by the fan

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

  • atmosphere, tank containing water, where the A.H.J. indicates
  • underground, into drain, into mechanical room
  • to chemical neutralizing tank only
  • none of the above

16: A professional or office building would be considered what type of occupancy?

  • commercial
  • business
  • mercantile
  • public assembly

17: Joints in piping for refrigeration containing parts must withstand temperatures of ___?

  • 600F
  • 700F
  • 800F
  • 1000F

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

  • cascade
  • single stage
  • booster
  • indirect

19: Pressure vessels with an internal volume of 3 cubic feet or more

  • shall use pressure relief devices or fusible plugs
  • shall use pressure relief devices
  • do not need pressure relief protection
  • shall use fusible plugs

20: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of

  • the aggregate of the high side and low side
  • the low side
  • the high side
  • 2.5 times the design pressure

21: On a ammonia compressor, the pressure of a forced fed oil pump is changed by varying the

  • adjustment of the spring tension of the TXV
  • cooling temperature set-point
  • opening at the pump outlet
  • opening at the pump inlet

22: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.

  • 80%
  • 99%
  • 75%
  • 90%

23: Fusible plugs must have what marked on them?

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

24: Pressure limiting devices are not required for systems containing less then ________ refrigerants.

  • 22 lbs
  • 13.9 lbs
  • 6.6 lbs
  • 44 lbs

25: Fractionation occurs when

  • some of the blended refrigerant evaporates or condenses before the rest of the blend
  • the pressures decreases as the heat load decreases
  • when a fraction of refrigerant is added as the full charge
  • the pressures increase as the heat load increases