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.

  • 90%
  • 80%
  • 99%
  • 75%

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

  • 3
  • 2
  • 5
  • 4

3: 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

4: A motor starter is a device that includes an overload and a _______?

  • contactor
  • 2-pole contacts
  • duel-coil
  • all of the above

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

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

6: What is an egress?

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

7: Indirect systems using Group II refrigerants

  • shall have all refrigerant containing parts except piping, installed in a Class T machine room
  • shall be used for mechanical equipment only
  • shall be used in refrigeration system in excess of 1,000 lbs
  • shall be used in refrigeration system less than 1,000 lbs

8: An azeotropic refrigerant is

  • a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
  • a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
  • a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
  • none of the above

9: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the

  • compressor
  • boiler
  • evaporator
  • outside the machinery room

10: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by

  • District Engineering Inspectors
  • Commissioned Inspectors
  • Master licensed Technician
  • both a or b

11: What is considered a cooling agent?

  • 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
  • any liquid used for the transmission of heat when condensation occur

12: Give an example of a secondary coolant?

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

13: What type refrigerant is NOT ozone depleting?

  • CFC
  • Halon
  • HCFC
  • HFC

14: Booster compressors connect to the ____ side of the compressor

  • oil side
  • vapor
  • liquid
  • low side

15: The high side float assembly meters refrigerant into the evaporator through the

  • upper chamber of the low side
  • lower chamber of the low side
  • upper chamber of the high side
  • lower chamber of the high side

16: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within

  • 1 week
  • 30 days
  • 14 days
  • 2 months

17: How many refrigerant classifications are there for toxicity?

  • 1
  • 2
  • 3
  • 5

18: Heat cannot of itself, pass from a

  • cold to a warmer body
  • warm to a colder body
  • state of hot energy to a state of cold energy
  • None of the above

19: Capacity control on a centrifugal compressor is accomplished by the

  • slide vanes
  • post-rotational guide vanes
  • check valves
  • pre-rotational guide vanes

20: What is the amp draw of a 40 VA transformer at 24 volts

  • 1K amps
  • 1.6 amps
  • 1,000 amps
  • 106 amps

21: The certificate of inspection

  • shall be $20 and an additional fee of $1 for each tone above 20 tons
  • shall be posted on the compressor shell or electrical panel at the unit
  • shall be authorized by a notarized insurance company
  • shall be posted and protected from dirt, water, and other elements

22: A 3-cubic foot receiver must have what type of relief valve?

  • fusible plug
  • relief valve
  • rupture device
  • none of the above

23: 746 watts is equal to

  • 10 hp
  • 1 hp
  • Pi
  • 100 hp

24: Bubbles in the liquid line sight glass could be caused by

  • overcharge of oil
  • leaking discharge valves in the compressor
  • bad low pressure switch
  • plugged drier

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

  • Volts
  • Ohms
  • Herys
  • Amps