Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: 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
  • 77F
  • 58F
  • 70F

2: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.

  • 2.5
  • 5.5
  • 3.0
  • 2.0

3: Low pressure chiller systems use what type of compressor?

  • Screw
  • Reciprocating
  • Scroll
  • Centrifugal

4: How many refrigerant classifications are there for flammability?

  • 2
  • 3
  • 1
  • 7

5: Ammonia (NH3) is a group III refrigerant

  • True
  • False

6: What is a megaohm meter?

  • An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
  • An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
  • Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
  • An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested

7: All electrical work done on refrigeration systems must comply with

  • NEC and Massachusetts Modifications
  • ASHREA-15 Section 9.2.1
  • OSHA
  • Department of Energy

8: Control systems can be classified by

  • tonnage of system
  • source of power
  • safety
  • economy of operation

9: Halogenated refrigerants cannot be used with what material?

  • Magnesium alloy
  • Stainless steel
  • Aluminum
  • Copper

10: A high side float is a

  • float type switch that stops the compressor when the pressure on the high side becomes too high
  • float type valve that controls the amount of refrigerant stored in the receiver
  • float type valve that controls the crankcase oil level
  • metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.

11: The amount of heat required to raise the temperature of 1 lb of water 1F is?

  • 1 Kelvin
  • 1 BTU
  • The rate of conduction
  • 1 Therm

12: The reversing valve is commonly used

  • on multiple compressor systems
  • on all heat pumps
  • when the code requires a check valve
  • on commercial system that involve two different temperatures

13: When an electronic bridge is in balance the bridge output will be

  • .01 volts
  • 1 volt
  • 0 volts
  • 15 volts

14: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.

  • 55
  • 50
  • 15
  • 75

15: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are

  • Buss-eye, weight, pressure, and frost line
  • sight glass, weight, pressure, and dipstick
  • sight glass, weight, pressure, and frost line
  • sight glass, weight, paper method, and frost line.

16: Which refrigerant replaced R-12?

  • R-22
  • R-410A
  • R-134A
  • R-407A

17: Industrial occupancy is

  • a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
  • is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
  • a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
  • Both a and b are correct

18: Clearance volume

  • is the same on all compressors
  • has no effect on compressor capacity
  • affects compressor capacity
  • varies depending on compressor speed

19: 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

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

  • 75%
  • 80%
  • 90%
  • 99%

21: The actual expansion curve of compressor follows most nearly which one of the following

  • Isothermal
  • Volume
  • Adiabatic
  • Pressure-Temperature

22: Increasing superheat will do what to your frost line?

  • Decrease
  • Nothing
  • Increasae
  • Could either increase or decrease depending on the load conditions

23: Fusible plugs must have what marked on them?

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

24: When can 50/50 solder be used?

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

25: The two float-type metering devices are the

  • liquid float and the low-side float
  • vapor float and the low-side float.
  • high-side float and the low-side float
  • liquid float and the vapor float