Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What must be done if refrigeration lines pass through a concrete floor?

  • leak checked
  • installed through a pipe casing
  • insulated
  • moisture barrier

2: An air conditioning system rated for 36,000 BTU's is equivalent to

  • 12,000 tons of cooling
  • two tons of cooling
  • one ton of cooling
  • three tons of cooling

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

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

4: 1 Watt = ______ BTU's?

  • 3.412
  • 12
  • 7.216
  • 4.482

5: Which is the lowest vacuum?

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

6: The best way to detect ammonia in brine is

  • CO2 gas
  • carbonation of soda
  • potassium of line
  • nessler regaent

7: one BTU equals

  • 3.41 hp
  • Pi
  • 31.4 hp
  • 12,000 hp

8: When can 50/50 solder be used?

  • in the low side
  • in the high side
  • liquid and suction lines
  • none of the above.

9: Laten heat is associated with a change in state of a refrigerant but not temperature

  • True
  • False

10: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)

  • 32F
  • 58F
  • 70F
  • 77F

11: 746 watts is equal to

  • 10 hp
  • 1 hp
  • 100 hp
  • Pi

12: Foaming of oil in a compressor is most likely to occur

  • when the evaporator temperatures are below 32F
  • at start-up
  • when ambient temperature are low
  • when there is insufficient air across the condenser(i.e., dirty coil)

13: A compressor that increases vapor pressure by changing the internal volume of the compression chamber is called?

  • Non-positive displacement
  • Pressure induced displacement.
  • Positive displacement
  • Low Pressure displacement

14: What is the refrigerant chlorodifluoromethane?

  • R-22
  • R-123
  • R-134a
  • R-12

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

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

16: R-123 belongs to Group

  • B-2
  • B-3
  • A-3
  • B-1

17: Evaporators within 18" of a heating coil must be equipped with a

  • pressure relief device
  • zone valve
  • high limit control
  • low limit control

18: Refrigerant restricted in 2004 but used for transition for decades:

  • R-11
  • R-123
  • R-134A
  • R-22

19: Booster compressors connect to the ____ side of the compressor

  • oil side
  • liquid
  • vapor
  • low side

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

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

21: NH3 is

  • lithium bromide
  • R-508A
  • ammonia
  • R-718

22: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?

  • 277v
  • 240v
  • 120v
  • 208v

23: How is bring measured?

  • hygrometer
  • manometer
  • hydrometer
  • anemometer

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

  • To chemical neutralizing tank only
  • Underground, into drain, into mechanical room
  • Atmosphere, Tank containing water, where the AHJ indicates.
  • None of the above.

25: A Lithium-bromide system is an absorption system that

  • uses ammonia as a refrigerant and lithium bromide as an absorbent
  • uses water as a absorbent and lithium bromide as a refrigerant
  • uses water as a refrigerant and lithium bromide as an absorbent
  • uses salts as an absorbent and lithium bromide as a refrigerant