Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What is a Category "M" fluid?

  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
  • Any fluid that exceeds 150 psig and has design temperatures over 366F
  • A typical refrigerant used on newer air conditioning and heat pump systems
  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and the designed temperature is between -20F to 366F

2: If the power element on an expansion valve should lose its charge, the valve would

  • Over feed
  • Stay open
  • Close
  • Under feed

3: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?

  • 96
  • 38
  • 88
  • 58

4: How many gallons of water do you need per pound of ammonia?

  • 10
  • 50
  • 100
  • 1

5: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of

  • moisture in the system
  • not enough oil in the system
  • low head pressure
  • oil in evaporator

6: 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

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

  • junction
  • series
  • series-parallel
  • parallel

8: A cross charged power element on an expansion valve would normally be used in what temperature range?

  • 30F to 50F
  • -40F to 0F
  • 0F-38F
  • -100F to -40F

9: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.

  • 100%
  • 75%
  • 80%
  • 90%

10: Refrigeration piping before being buried shall be

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

11: A relief valve shall be located at least ___ above grade.

  • 15'
  • 10'
  • 25'
  • 36'

12: A halide torch is most useful with a freon compression system

  • to sweat flanges on the refrigeration piping
  • to detect refrigeration leaks in piping joints
  • to remove from from TXV's and evaporator coils
  • to release a sticking valve

13: Pressure vessels with an internal volume of 3 cubic feet or more

  • shall use fusible plugs
  • shall use pressure relief devices
  • shall use pressure relief devices or fusible plugs
  • do not need pressure relief protection

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

  • 55 lbs
  • 330 lbs
  • 500 lbs
  • 660 lbs

15: On a ammonia compressor, the pressure of a forced fed oil pump is changed by varying the

  • adjustment of the spring tension of the TXV
  • opening at the pump inlet
  • cooling temperature set-point
  • opening at the pump outlet

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

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

17: What chemical in the refrigerant set off the leak detection alarm?

  • Fluorine
  • Chlorine
  • Both A and B
  • none of the above

18: 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

19: Thermodynamics is the branch of science that deals with

  • state of energy
  • heat energy
  • energy due to motion
  • molecular therory

20: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.

  • 1.2
  • 2.2
  • 1.5
  • 1

21: When the compressor is below the condensor

  • traps are needed on the suction line
  • traps are needed on the oil return line
  • traps are needed on the discharge line
  • traps are not needed on this type of system

22: The solution that is pumped into the concentrator in an absorption chiller is referred to as the

  • weak solution
  • absorbed solution
  • concentrated solution
  • strong solution

23: Where are the three places that the discharge from an ammonia relief valve be piped?

  • atmosphere, tank containing water, where the A.H.J. indicates
  • underground, into drain, into mechanical room
  • to chemical neutralizing tank only
  • none of the above

24: Defined process piping by code CMR (528)

  • Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
  • Any piping in an industrial space
  • Any piping in an industrial or commercial space
  • All of the above

25: A Lithium-bromide system is an absorption system that

  • uses water as a absorbent and lithium bromide as a refrigerant
  • uses water as a refrigerant and lithium bromide as an absorbent
  • uses salts as an absorbent and lithium bromide as a refrigerant
  • uses ammonia as a refrigerant and lithium bromide as an absorbent