Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A mercury bulb controller is not recommended for

  • low voltage use
  • line or low voltage use
  • use where vibration is severe
  • line voltage use

2: Give an example of a secondary coolant?

  • R-718
  • R-717
  • R-12
  • R-410A

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

  • Herys
  • Ohms
  • Volts
  • Amps

4: R-11 has the greatest corrosive effect on

  • Bronze
  • Aluminum
  • Magnesium
  • Copper

5: The outer portion of shell of the compressor used on low-pressure chillers is called the

  • suction
  • baffle
  • nozzle
  • volute

6: Who is permitted to access a refrigeration machine room?

  • Contractors only
  • Anyone, it's a completely safe area
  • Authorized persons only
  • Any employee

7: Fractionation occurs when

  • the pressures decreases as the heat load decreases
  • the pressures increase as the heat load increases
  • when a fraction of refrigerant is added as the full charge
  • some of the blended refrigerant evaporates or condenses before the rest of the blend

8: What type of relief valve is used on a CO2 system?

  • rupture disc
  • fusible plug
  • gate valve
  • glove disc

9: What is the temperature that a liquid and a vapor can exist in equilibrium called?

  • Wet bulb temperature
  • Saturated temperature
  • Dry bulb temperature
  • Critical temperature

10: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?

  • motor starter
  • printed circuit board (PCB)
  • duel-voltage switch
  • centrifugal switch

11: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?

  • checking the level of refrigerant in the system
  • testing for oil in the system
  • testing for moisture in the system
  • none of the above

12: How many flammability classifications are refrigerants in?

  • 7
  • 2
  • 3
  • 5

13: A 24 volt transformer with a 240 volt primary can handle how many amps?

  • There isn't enough information to answer.
  • 10 amps
  • 20 amps
  • 24 amps

14: Heat that changes the physical state of a substance without effecting a change in its temperature is known as

  • latent heat
  • lost heat
  • specific heat
  • sensible heat

15: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.

  • CFC-11
  • ammonia
  • Lithium bromide
  • HCFC-123

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

  • 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
  • located outside the operates in temperatures below 35F

17: Electricity involves the movement of electrons in atoms

  • True
  • False

18: What do you need to do when you install a new system?

  • Add refrigerant
  • Insulate the suction line before you take a superheat reading
  • Have it inspected
  • Document the superheat and subcooling reading

19: What is potential measured in?

  • Henrys
  • Ohms
  • Volts
  • Amps

20: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.

  • 24
  • 18
  • 15
  • 10

21: When the compressor is below the condensor

  • traps are not needed on this type of system
  • traps are needed on the discharge line
  • traps are needed on the suction line
  • traps are needed on the oil return line

22: What is considered a cooling agent?

  • any liquid used for the transmission of heat when condensation occur
  • any liquid used for the transmission of heat without condensation
  • any liquid used for the transmission of heat without vaporization
  • any liquid used for the transmission of heat when vaporization occurs

23: 746 watts is equal to

  • 1 hp
  • Pi
  • 100 hp
  • 10 hp

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

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

25: Which refrigerant replaced R-12?

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