Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Can ammonia be used on domestic system?

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

2: The best way to detect ammonia in brine is

  • potassium of line
  • CO2 gas
  • carbonation of soda
  • nessler regaent

3: Refrigeration piping before being buried shall be

  • leak tested
  • encased in pipe duct
  • pressure tested
  • All of the above

4: What is the refrigerant chlorodifluoromethane?

  • R-12
  • R-22
  • R-134a
  • R-123

5: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.

  • Lithium bromide
  • HCFC-123
  • CFC-11
  • ammonia

6: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to

  • liquid line that is too small
  • shortage of refrigerant
  • liquid line that had too high vertical lift
  • All of the above

7: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?

  • When there are sprinklers above
  • When its white
  • When there is a space 6' or more above it
  • When it's used as part of a supply or return air system

8: What is the purpose of suction/discharge traps?

  • to ensure proper oil return to the compressor
  • to keep oil inside the evaporator for proper oil return to the compressor
  • to keep oil inside of the accumulator for proper return to the compressor
  • all of the above

9: How many square inches per square foot?

  • 144
  • 64
  • 98
  • 24

10: What refrigerant has zero ozone depletion

  • HFC
  • CFC
  • HCFC
  • None of the above

11: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is

  • reset the expansion valve
  • start the comrpessor
  • start the fan and circulating pump
  • reset the safety valve

12: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?

  • R-113
  • R-11
  • R-22
  • R-12

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

14: The location of a thermal bulb of a TXV affects

  • the amount of liquid refrigerant in the evaporator
  • the amount of liquid in the condenser.
  • the amount of liquid returning to the compressor
  • subcooling

15: Electricity involves the movement of electrons in atoms

  • True
  • False

16: Secondary refrigerants are usually

  • water or brine
  • alcohol
  • Prestone anti-freeze
  • expensive

17: Total heat of a substance is considered

  • specific heat
  • sensible heat
  • empathetical
  • enthalpy

18: What refrigerant doesn't have to be classified?

  • R-717
  • R-718
  • R-422A
  • R-134A

19: What is Trichlorotrifluoromethane?

  • R-113
  • R-12
  • R-13
  • R-11

20: When an electronic bridge is in balance the bridge output will be

  • 15 volts
  • 0 volts
  • 1 volt
  • .01 volts

21: Liquid line filter-driers on a 410A system must be rated for no less than

  • 1000 psig
  • 600 psig
  • 400 psig
  • 200 psig

22: The principle used in continuous type absorption systems is

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

23: R-11 belongs to Group

  • A-2
  • A-1
  • B-3
  • B-1

24: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is

  • lift voltage
  • run voltage
  • boost voltage
  • pick-up voltage

25: Direct systems using Group II refrigerants

  • shall be installed per instruction of the AHJ
  • shall be installed in Class T machinery rooms
  • shall be allowed to be used for human comfort.
  • shall not be used for air condition for human comfort