Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Adjusting the spring pressure on a TXV

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

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

  • Copper
  • Magnesium alloy
  • Stainless steel
  • PVC

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

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

4: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.

  • the atmosphere
  • a de-pressurized recovery tank with a silver top and yellow bottom
  • a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
  • All of the above

5: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.

  • 250
  • 350
  • 100
  • 400

6: The critical temperature of a refrigerant gas occurs when

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

7: How many volts would you read on a 480V system phase to phase?

  • 480
  • 277
  • 1/3 the voltage

8: Which oil is hydoscopic?

  • animal
  • SW30
  • mineral
  • polyolester

9: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig

  • 365 psig
  • 327 psig
  • 255 psig
  • 125 psig

10: R-22 is considered a(n)

  • HFC
  • HCFC
  • HCFCH
  • CFC

11: 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

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

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

13: Heat is a form of

  • work
  • power
  • matter
  • energy

14: How many groups of refrigerants are there?

  • 5
  • 7
  • 1
  • 3

15: Which of the following is an example of an azeotropic refrigerant?

  • R-404A
  • R-500
  • R-410A
  • R-134A

16: A check valve is a device

  • designed to allow the flow of refrigerant gas in both directions
  • that is always spring loaded
  • with a pressure drop
  • found on high pressure steam systems

17: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is

  • reset the safety valve
  • start the fan and circulating pump
  • reset the expansion valve
  • start the comrpessor

18: 746 watts is equal to

  • 100 hp
  • 10 hp
  • Pi
  • 1 hp

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

  • 99%
  • 75%
  • 80%
  • 90%

20: A positive displacement compressor is

  • where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
  • is a reciprocating type compressor with 2 or more pistons
  • a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
  • a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber

21: An accumulator can be located between the

  • evaporator and compressor
  • condenser and evaporator
  • compressor and condenser
  • first stage and second stage compressors

22: Which is considered the more efficient condenser?

  • water cooled
  • air cooled
  • spray cooled
  • fan cooled

23: Name an HCFC refrigerant(s):

  • R-22
  • R-123
  • R-11
  • both a & b

24: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered

  • public assembly occupancy
  • commercial occupancy
  • mixed occupancy
  • institutional occupancy

25: Liquid level gauges must be provided with what?

  • Automatic shut-offs
  • A relief valve
  • A low level mark
  • A red line