Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.

  • color-coded glass to determine type of refrigerant
  • moisture indicators
  • automatic closing shut-off valves
  • All of the above

2: How are refrigerant blends classified?

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

3: When can 50/50 solder be used?

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

4: Horizontal piping should be run level.

  • Yes, if the condenser is located above the evaporator
  • No, unless the supervisor on the job says so.
  • True
  • False

5: If a purge unit fails on a low pressure chiller, what are the symptoms?

  • low suction pressure
  • low pressure chillers do not have purge units
  • high head pressure
  • increased capacity

6: The leaving chilled water set point for comfort cooling is typically?

  • 66
  • 45
  • 60
  • 38

7: Halogen refrigerants are corrosive to which type of metal?

  • stainless steel
  • copper
  • magnesium
  • black iron

8: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be

  • 70.8 psig
  • 43.3 psig
  • 66.1 psig
  • 50.2 psig

9: One watt of electrical energy in a resistive heater will provide _____ BTU/hr

  • 3.415
  • 34.15
  • 6.830
  • 16.64

10: How do you find net oil pressure on a compressor?

  • discharge pressure - suction pressure
  • gross oil pressure - suction pressure
  • gross oil pressure - discharge pressure
  • all of the above

11: 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

12: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?

  • 12,000 BTU
  • 144 BTU
  • 970 BTU
  • 24,000 BTU

13: The critical temperature of a refrigerant gas occurs when

  • the gas returns to a liquid
  • the gas is no longer saturated
  • any increase in pressure will not liquefy the gas
  • any decrease in pressure will cause condensation

14: What is the voltage of each leg of a 480 Volt three-phase motor?

  • 277v
  • 120v
  • 240v
  • 208v

15: 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

16: A start capacitor is wired in _____ with the start windings.

  • series-parallel
  • parallel
  • series
  • junction

17: On cooling towers, what causes the condenser water to drop

  • ambient temperatures
  • tower fans
  • evaporation of the water droplets
  • sensible heat

18: What is Absolute Zero?

  • -400F
  • -773F
  • -460F
  • -640F

19: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.

  • There isn't enough information to answer.
  • 2.5
  • 2
  • 1250

20: Adjusting the spring pressure on a TXV

  • changes superheat
  • makes no difference
  • adjusts the bulb charge
  • changes subcooling

21: Pi equals approximately

  • 3.41
  • 746
  • 12,000
  • 3.14

22: The critical temperature of a refrigerant gas occurs when

  • any decrease in pressure will cause condensation
  • the gas is no longer saturated
  • the gas returns to a liquid
  • any increase in pressure will not liquefy the gas

23: 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 a system highly likely to leak from a failed connection or component of such system
  • is such that any leak will cause injury or death to anyone within a 100 square foot area

24: Most CFC's are

  • flammable
  • inert but toxic
  • toxic
  • inert

25: All machine rooms must be outfitted with a detector that _______?

  • activates an audible alarm
  • activates a visual alarm
  • starts the ventilation system
  • All of the above