Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Dew point is

  • the temperature above which water vapor in the air will start to condense
  • the temperature below which water vapor in the air will start to condense
  • the temperature of air of 50% RH
  • the temperature below which water vapor in the air will start to evaporate

2: The start winding has _____ turns than the run winding.

  • more
  • less
  • the same
  • none of the above

3: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?

  • Nesting scrolls
  • Fan-like action
  • Suction and discharge valves
  • Rotating vanes

4: How many gallons of water per pound of ammonia do you need?

  • 20
  • 5
  • 1
  • 15

5: Transformers are rated in

  • amps
  • volts
  • volt-amps
  • volts-ohms

6: What was the main reason for enacting the no venting rule of July 1, 1992?

  • Ozone depletion
  • Green house effect
  • Global warming potential
  • All of the above

7: Where are the three places that the discharge from an ammonia relief valve be piped?

  • To chemical neutralizing tank only
  • Underground, into drain, into mechanical room
  • Atmosphere, Tank containing water, where the AHJ indicates.
  • None of the above.

8: A professional or office building would be considered what type of occupancy?

  • business
  • mercantile
  • commercial
  • public assembly

9: The density of a gas refers to

  • pounds per cubic foot
  • pounds per square foot
  • cubic feet per pound
  • pounds per absolute pressure

10: The equivalent length of pipe in a water piping system is

  • the total length of pipe as you would measure it plus 25% for fittigns
  • the total length of pipe as you would measure it
  • the total length of pipe plus equivalent of fittings multiplied by 2.31
  • the total length of pipe plus equivalent-length of fittings

11: In a motor, an internal overload might open if

  • there's an open start winding
  • there was a high pressure refrigerant was used for a low pressure system.
  • there's a direct short
  • there's an excess current draw through the motor

12: The gauge thickness required on a CO2 tank construction is

  • 3/32"
  • 1/8"
  • 1/16"
  • 5/16"

13: Heat is a form of

  • power
  • work
  • energy
  • matter

14: What would be the classification of a prison?

  • Large mercantile
  • Industrial
  • Place of assembly
  • Institutional

15: Who approves containers for refrigerants?

  • D.O.E
  • D.O.D
  • D.O.T
  • E.P.A

16: Liquid level gauges must be provided with what?

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

17: Oils, classified as to source, are

  • animal, vegetable, and mineral
  • naphthalene, paraffin, and castor
  • naphthalene, mixed, and paraffin
  • animal, vegetable, and castor

18: The purpose of a receiver is

  • a vessel to store refrigerant outside the system
  • to increase the capacity that the system can hold
  • to use a a later date
  • all of the above

19: Which is the lowest vacuum?

  • 1,000 Microns
  • 5 psig
  • 5" hg
  • 10 psia

20: Foaming of oil in a compressor is most likely to occur

  • when ambient temperature are low
  • when there is insufficient air across the condenser(i.e., dirty coil)
  • at start-up
  • when the evaporator temperatures are below 32F

21: Fractionation occurs when

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

22: The critical temperature of a refrigerant gas occurs when

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

23: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of

  • the ASME Boiler and Pressure Vessel Code
  • Section 11.3.1.5 ASHRAE 15 Standard
  • the ANSI Standard 10.7.2
  • both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5

24: Total heat of a substance is considered

  • specific heat
  • enthalpy
  • empathetical
  • sensible heat

25: 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.