Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: An electronic bridge circuit is basically a

  • 24 volt control circuit
  • suspension
  • high voltage circuit
  • Wheatstone

2: Stop valves shall not be permitted between the system and the

  • condenser
  • bleed valve
  • relief valve
  • service valve

3: The principle used in continuous type absorption systems is

  • Dalton's Law
  • Boyle's Law
  • Ohm's Law
  • Charles's Law

4: Doors communicating with outside from a mechanical room must be?

  • Self-closing, approved, fire door
  • Steel, approved, weather-stripped
  • Self-closing, aligned, fire door
  • Self-closing, wooden, fire door

5: One ton of refrigeration is defined as ______ btu/minute.

  • 200
  • 12,000
  • 60
  • 720,000

6: 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

7: The 522 CMR 9.00 has adopted for reference ASHRAE ____

  • 10
  • III
  • 25
  • 15

8: What type of material can't be used on the outlet of a relief valve?

  • Magnesium alloy
  • Stainless steel
  • Copper
  • PVC

9: In designing duct work, pressure and ______ need to be considered

  • length
  • CFM
  • duct sealant used
  • all of the above

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

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

11: Relief valves are rated in

  • gallons of water per hour
  • pounds of air per minute
  • gallons of water per minute
  • pounds of air per hour

12: How are safety controls wired in a circuit?

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

13: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?

  • 1%
  • 25%
  • 4%
  • 2%

14: The measurement of heat in a particular substance is

  • enthalpy
  • specific heat
  • latent heat
  • sensible heat

15: What is R-22?

  • CCFCM
  • HFC
  • Chlorodifluoromethane
  • Chlorofluoromethane

16: Pressure vessels of 10 cubic feet or more gross volume shall use

  • at least one rupture member
  • a dual pressure-relief valve if charging into the atmosphere
  • at least three means of discharge and/or rupture discs
  • both a and b are correct

17: On a centrifugal compressor, stationary diffuser vanes are needed to

  • prevent high pressure on the packing
  • increase the clearance space
  • convert velocity energy to pressure
  • stop gas flow

18: The first step in mechanical refrigeration is

  • compression
  • expansion
  • evaporation
  • condensation

19: The External equalizer of a TXV compensates for

  • pressure drop across the condenser coil
  • pressure within the system
  • pressure within the evaporator
  • pressure drop across the evaporator coil

20: If a halide torch is used for leak detection, what color is the flame if it detects a leak?

  • green
  • orange
  • blue
  • red

21: A start capacitor is wired in _____ with the start windings.

  • series
  • parallel
  • junction
  • series-parallel

22: What will occur if the strong solution in an absorption chiller becomes too strong?

  • The machine will stop cooling and the solution will evaporate.
  • The machine will cool excessively as the solution evaporates
  • The machine will cool excessively as the solution crystallizes.
  • The machine will stop cooling and solution will crystallize

23: R-12. R-22, and R-40 are considered Group I refrigerants.

  • True
  • False

24: On a single phase motor, when does the start winding cut out?

  • 50% of its RLA speed
  • 25% of its RLA speed
  • 100% of its RLA speed
  • 75% of its RLA speed

25: What must be done to refrigerant pipes before being buried ?(8.10.4)

  • Insulated and installed in a pipe duct (Encased)
  • Certified
  • Leak checked
  • Classifed