Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What is the purpose of a surge capacitor on a contactor?

  • to protect low voltage equipment
  • to keep the contactor pulled in
  • to balance the sine waves
  • to provide smoother start/stops

2: A EPR valve is installed on what type of evaporators?

  • plate evaporators
  • high-temperature evaporators
  • shell and tube evaporators
  • low-temperature evaporators

3: No open flames are allowed in the machinery room unless?

  • Only when combustion air is provided from outside of the machinery room
  • Approved by the installing contractor
  • Approved by the authorized person
  • Never can be allowed

4: 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

5: A plug containing an alloy that will melt at a specific temperature to relief pressure is a

  • fusion plug
  • fusible plug
  • relief plug
  • rupture plug

6: What happens to copper joints when overheated?

  • nothing
  • joint becomes oxidized and ditorted
  • copper becomes harder
  • none of the above

7: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.

  • 20
  • 15
  • 50
  • 75

8: What refrigerant doesn't have to be classifted?

  • R-711
  • R-718
  • R-717
  • R-134a

9: 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)?

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

10: A start capacitor in series with a start winding will

  • increase starting torque
  • decrease the amp draw of the motor
  • increase running efficiency
  • increase the amp draw of the motor

11: What is used to check very low air pressures in air conditioning duct?

  • Barometer
  • Vacuum gauge
  • Anemomter
  • Manometer

12: Give an example of a secondary coolant?

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

13: A rule of thumb in air conditioning is ____ CFM per ton?

  • 500
  • 100
  • 400
  • 600

14: How are safety controls wired in a circuit?

  • Series
  • Parallel
  • Series/parallel
  • Either series or parallel

15: A restaurant is classified as a

  • mixed occupancy
  • commercial occupancy
  • public assembly occupancy
  • large mercantile occupancy

16: Total heat of a substance is considered

  • specific heat
  • enthalpy
  • empathetical
  • sensible heat

17: Which refrigerant class listed below is the most flammable?

  • A3
  • B2
  • A2
  • C3

18: Control systems can be classified by

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

19: What is an egress?

  • A valve put on the low side of the system to prevent frosting
  • A code violation
  • An entrance or exit
  • An escape route

20: 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

21: If air is present in an absorption chilled water appliance, which of the following will most likely occur?

  • The Li-Br solution will become more diluted
  • System operating pressure will drop
  • The Li-Br solution will become more concentrated
  • Rust can form

22: One atmosphere equals

  • 0 psig
  • 14.7
  • 29.4
  • 0 psia

23: A water regulating valve opens when

  • the compressor is on
  • when the power is on
  • the head pressure rises
  • when the power is on there is an overcharge of refrigerant

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

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

25: _____ alloys shall not be used in contact with an halogenated refrigerants.

  • Magnesium
  • Zinc
  • Copper
  • Nickel