Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: In an electrical circuit, what is potential measured in?

  • Amps
  • Volts
  • Ohms
  • Herys

2: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.

  • 80%
  • 100%
  • 90%
  • 75%

3: 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

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

  • Reciprocating
  • Scroll
  • Screw
  • Centrifugal

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

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

6: Suction line oil traps should be installed when the condenser is

  • located outside the operates in temperatures below 35F
  • in the basement and the evaporator is on the third floor
  • more than 100' away from the evaporator
  • on the third floor roof and the evaporator is in the basement

7: On a large centrifugal system, what meters the flow to the evaporator?

  • High side float
  • Low side float
  • TXV
  • Cap tube.

8: The measurement of heat in a particular substance is

  • enthalpy
  • sensible heat
  • specific heat
  • latent heat

9: An azeotropic refrigerant is

  • a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
  • a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
  • a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
  • none of the above

10: The two basic types of evaporators are

  • prime surface and finned
  • flooded and direct expansion
  • finned and plate
  • direct expansion and plate

11: The generator shell contains the

  • condenser and the absorber
  • condenser, the evaporator, and the generator
  • condenser and the generator
  • evaporator and the absorber

12: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is

  • drawing RLA and is running as it should
  • drawing LRA and is seized and should be replaced.
  • running hot
  • none of the above

13: Refrigerants shall be classified by

  • requirements for commercial, industrial, and residential occupancies
  • color codes
  • toxicity and flammability
  • maximum permissible quantities of each group

14: What refrigerant doesn't have to be classified?

  • R-718
  • R-422A
  • R-717
  • R-134A

15: The reversing valve is commonly used

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

16: A single pole-double throw switch used how many wires excluding the ground wire?

  • two
  • four
  • three
  • five

17: Pressure vessels with an internal volume of 3 cubic feet or less

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

18: How can you test mechanical strength of an electrical connection?

  • measure ohms with an electrical meter
  • measure voltage across the connection
  • attempt to pull the wire from the connector by hand
  • none of the above.

19: The main purpose of the accumulator is to

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

20: What is a Category "D" fluid?

  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
  • A typical refrigerant used on newer air conditioning and heat pump ssytems
  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
  • Any fluid that exceeds 150 psig and has design temperature of over 366F

21: A room having machinery but no flame producing apparatus permanently installed and operated is considered a

  • Class B machinery room
  • Class M machinery room
  • Class A machinery room
  • Class T machinery room

22: Fusible plugs must have what marked on them?

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

23: What type of voltage cause a potential relay to open?

  • 24 volt supply from the thermostat
  • 120 volt line voltage
  • Back electro-motive force (BEMF)
  • none of the above

24: E = I X R is

  • Amps Law
  • Watts Law
  • Ohms Law
  • Impedance Law

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

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