Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Megaohm meters can detect a ground in the

  • up to 1,000,000 ohms
  • 10,000,000 ohms or higher
  • up to 1,000 ohms
  • up to 10,000 ohms

2: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.

  • 3.0, 3.5
  • 2.5, 2.5
  • 2.5, 3.0
  • 6.6, 6.6

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

  • 3
  • 1
  • 4
  • 2

4: R-123 belongs to Group

  • B-1
  • B-2
  • A-3
  • B-3

5: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants

  • higher
  • the same
  • there is no Group B1 refrigerants
  • lower

6: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.

  • the atmosphere
  • a de-pressurized recovery tank with a silver top and yellow bottom
  • a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
  • All of the above

7: "E" references ____ in the Ohm's law formula

  • resistance
  • amperage
  • voltage
  • capacitance

8: Which refrigerant(s) is an HFC?

  • R-22
  • R-410A
  • R-502
  • All of the above

9: 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

10: Capacity control on an absorption system is typically accomplished by varying the

  • speed of the chilled water circulatory pump
  • pressure setting on the system's rupture disc
  • speed of the condenser water circulator pump
  • rate at which heat is supplied to the generator

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

  • R-22
  • R-12
  • R-11
  • R-113

12: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the

  • 24 volt secondary side of the Class 2 transformer to the thermostat
  • first disconnect in
  • breaker panel in
  • load-side of the contactor in

13: Which refrigerant class listed below is the most flammable?

  • C3
  • B2
  • A2
  • A3

14: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?

  • it would have no effect on the condenser
  • it would make the condenser less efficient
  • it would cause the condenser to sweat
  • it would make the condenser more efficient

15: System design pressures must take into consideration, not only, pressures found during normal operation but also what?

  • When it's cold out
  • When there is a malfunction on the high side
  • When its warm out
  • All of the above

16: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the

  • low side of the system
  • high side float assembly
  • cap tube
  • none of the above

17: The solution that leaves the concentrator in an absorption chiller is referred to as the

  • strong solution
  • absorbed solution
  • weak solution
  • diluted solution

18: If the spring is adjusted to increase the superheat, this new setting will

  • lengthen the frost line
  • shorten the frost line
  • have no effect on the frost line
  • allow more liquid into the evaporator

19: On a single phase motor, when does the start winding cut out?

  • 25% of its RLA speed
  • 100% of its RLA speed
  • 75% of its RLA speed
  • 50% of its RLA speed

20: What kind of material can't be used on the outlet of a relief valve?

  • PVC
  • Stainless Steel
  • Copper
  • Aluminum

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

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

22: What device measures the specific gravity of a substance?

  • Thermometer
  • Hygrometer
  • Hydrometer
  • Manometer

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

  • Enthalpy
  • Specific heat
  • Latent heat
  • Sensible heat

24: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?

  • Oil
  • Air
  • Heat
  • Electricity

25: 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