Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Oils, classified as to source, are

  • animal, vegetable, and mineral
  • animal, vegetable, and castor
  • naphthalene, mixed, and paraffin
  • naphthalene, paraffin, and castor

2: What will occur if the strong solution in an absorption chiller becomes too strong?

  • The machine will cool excessively as the solution crystallizes.
  • The machine will cool excessively as the solution evaporates
  • The machine will stop cooling and the solution will evaporate.
  • The machine will stop cooling and solution will crystallize

3: What type of material can't be used on the outlet of a relief valve?

  • Copper
  • Magnesium alloy
  • Stainless steel
  • PVC

4: The start winding has _____ turns than the run winding.

  • more
  • less
  • the same
  • none of the above

5: The main purpose of the accumulator is to

  • prevent liquid slugs at the compressor
  • store liquid refrigerant
  • provide space for the accumulation of oil and containminants
  • provide space for vapor to accumulate

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

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

7: What device should be used on low-temperature freezers?

  • high capacity TXV
  • discharge muffler
  • oil separator
  • hot-gas by-pass

8: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?

  • phosgene gas sening
  • refrigerant sensing
  • CO Sensing
  • A group sensing

9: Usually dry bulb temperature is

  • lower than dry bulb temperature
  • same as wet bulb temperature
  • higher than wet bulb temperature
  • not important and shall be ignored

10: Ammonia belongs to Group

  • B-1
  • A-1
  • B-2
  • A-2

11: How many refrigerant classifications are there for flammability?

  • 1
  • 7
  • 2
  • 3

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

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

13: The best way to detect ammonia in brine is

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

14: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?

  • Relief valve
  • T&P device
  • Temperature limiter device
  • Circuit Breaker

15: 746 watts is equal to

  • 100 hp
  • 10 hp
  • Pi
  • 1 hp

16: What type of copper is not permitted on refrigeration systems?

  • Type K
  • Type L
  • Type N
  • Type M

17: When an A/C system is excessively low on refrigerant

  • it can become contaminated with water
  • there can be nuisance trip outs
  • the suction line may be too hot to touch
  • All of the above

18: Fractionation occurs when

  • the pressures increase as the heat load increases
  • 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

19: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the

  • boiler
  • outside the machinery room
  • evaporator
  • compressor

20: What is absolute humidity?

  • the amount of moisture in the air per one pound of 50% RH air
  • the amount of moisture in the air in grains of cubic feet of volume
  • the amount of moisture in the air in grains of square feet of volume
  • none of the above

21: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?

  • 96
  • 38
  • 88
  • 58

22: What effect does the temperature of air have on humidity?

  • warmer air holds more moisture then cooler air
  • cooler air holds more moisture then warmer air
  • air has no effect of humidity
  • none of the above

23: Class A refrigerants are considered

  • non-flammable
  • toxic
  • non-toxic
  • flammable

24: The rupture disc on a low-pressure chiller typically releases pressure at

  • 15 psig
  • 10 psig
  • 0 psig
  • 5 psig

25: The main purpose of a refrigerant detector in a machinery room is to

  • inform there is a refrigerant leak int he system
  • detect toxins in the air caused by a refrigerant leak
  • to set off an alarm when there is refrigerant present inside the room
  • all of the above