Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.

  • 80%
  • 75%
  • 99%
  • 90%

2: Dew point is

  • 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
  • the temperature above which water vapor in the air will start to condense

3: What is used to check very low pressure?

  • Hydrometer
  • Velometer
  • Manometer
  • Hygrometer

4: What section governs pressure vessels?

  • Section 8 ASHREA 15 ASME unfired
  • OSHA
  • Section 1 ASHREA 15 ASME fired
  • Section ASHREA 34

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

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

6: one BTU equals

  • 31.4 hp
  • 3.41 hp
  • Pi
  • 12,000 hp

7: Where can 50/50 solder be used on?

  • suction line
  • liquid line
  • discharge line
  • none of the above

8: A single pole-double throw switch uses how many wires?(excluding the ground)

  • 3
  • 4
  • 5
  • 2

9: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit

  • 9.776 watts
  • 977.6 watts
  • .9776 watts
  • 9,776 watts

10: Can ammonia be used on domestic system?

  • no, unless there is proper ventilation system installed
  • yes
  • no
  • yes, for systems under 10 tons

11: What is Absolute Zero?

  • -460F
  • -400F
  • -640F
  • -773F

12: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?

  • Circuit Breaker
  • Relief valve
  • Temperature limiter device
  • T&P device

13: Which of the following are considered inorganic refrigerants?

  • R-717 and R-718
  • 410A and R-407C
  • R-500 and R-502
  • None of the above

14: Which occupancy can ammonia be used in?

  • redifential
  • commercial
  • industrial
  • depends on the quantity of freon

15: R-11 has the greatest corrosive effect on

  • Bronze
  • Magnesium
  • Copper
  • Aluminum

16: The actual expansion curve of compression follows most nearly which one of the following curves?

  • Volume Temperature
  • Pressure Temperature
  • Isothermal
  • Adiabatic

17: 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

18: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is

  • Specific heat
  • Latent heat
  • Enthalpy
  • Sensible heat

19: 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

20: If a purge unit fails on a low pressure chiller, what are the symptoms?

  • low pressure chillers do not have purge units
  • increased capacity
  • low suction pressure
  • high head pressure

21: A pressure relief should be located at least _______ from windows and doors.

  • 15'
  • 20'
  • 30'
  • 25'

22: If the power element of an expansion valve should lose its charge the valve would

  • go closed
  • overfeed the evaporator
  • underfeed the evaporator
  • go open

23: Heat is a form of

  • power
  • matter
  • work
  • energy

24: Halogen refrigerants are corrosive to which type of metal?

  • stainless steel
  • magnesium
  • copper
  • black iron

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

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