Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Ammonia can come in contact with _______ ?

  • Brass
  • Copper tubing
  • Aluminum
  • Copper

2: A High-Probablity system

  • is a system highly likely to leak from a failed connection or component of such system
  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is such that a leak of refrigerant from failed connections will enter the unoccupied space
  • is such that a leak of refrigerant from failed connections will enter the occupied space

3: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and

  • gas masks must be worn
  • the owner shall be informed
  • explosion precautions must be taken
  • no flames shall be permitted

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

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

5: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are

  • sight glass, weight, paper method, and frost line.
  • sight glass, weight, pressure, and frost line
  • Buss-eye, weight, pressure, and frost line
  • sight glass, weight, pressure, and dipstick

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

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

7: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed

  • 660 lbs
  • 55 lbs
  • 550 lbs
  • 330 lbs.

8: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested

  • annually
  • bi-annually
  • quarterly
  • regularly

9: On a large centrifugal system, what meters the flow to the evaporator?

  • Cap tube.
  • TXV
  • High side float
  • Low side float

10: Which winding have the most turns?

  • run
  • depends on the motor phase
  • they have equal amount of turns
  • Start

11: What would be the classification of a church?

  • Industrial
  • Place of assembly
  • Large mercantile
  • Institutional

12: When a refrigeration or air conditioning system is installed

  • a field inspection shall be made before it is put into service
  • it shall be approved by the owner for proper operation.
  • it shall not be operated below prescribed pressures
  • the form of certificate shall be authorized by the Department of Pubic safety

13: How many opening forces operate a thermostatic expansion valve?

  • 3
  • 1
  • 4
  • 2

14: Which refrigerant is lighter than air?

  • R-11
  • R-717
  • R-134a
  • R-123

15: Name a reason that does not cause reduced condenser air quantity

  • Dirty fan blades
  • High ambient temperature
  • Prevailing winds
  • Dirty Coil

16: Which of the following is NOT a positive displacement compressor?

  • screw
  • scroll
  • centrifugal
  • reciprocating

17: Pi equals approximately

  • 3.14
  • 12,000
  • 3.41
  • 746

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

  • stainless steel
  • copper
  • black iron
  • magnesium

19: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.

  • shall be prohibited
  • of Group B2 refrigerant shall be prohibited
  • shall not be prohibited
  • containing R-11, R-123 & R-717 exclusively shall not be prohibited

20: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against

  • 88
  • 108
  • 116
  • 38

21: Industrial occupancy is

  • a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
  • is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
  • a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
  • Both a and b are correct

22: When air is ducted through a machine room that services occupied space, What must be done?

  • Insulated and cross broke
  • Welded and seamed.
  • Flanged and gasketed
  • Ducted and sealed

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

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

24: If air is present in an absorption chilled water appliance, which of the following will most likely occur?

  • Rust can form
  • The Li-Br solution will become more concentrated
  • System operating pressure will drop
  • The Li-Br solution will become more diluted

25: 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.

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