Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The purpose of an accumulator is to

  • assure no liquid returns to the compressor
  • filter out impurities from the system
  • store excess refrigerant from the reciver
  • reduce friction loss to the flow of refrigerant

2: Refrigeration piping before being buried shall be

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

3: What is the maximum voltage range allowed on an electrical circuit?

  • 15%
  • 20%
  • 5%
  • 10%

4: Before replacing a seized compressor, the _______ should be determinded.

  • type of refrigerant
  • current draw
  • cause of seizure
  • designed head pressure

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

  • R-11
  • R-113
  • R-22
  • R-12

6: Start to Run windings will have what resistance?

  • The most resistance value
  • The least resistance value
  • All will be at equal values
  • Somewhere between the actual start winding and run winding resistance value

7: A positive displacement compressor is

  • a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
  • where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
  • a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
  • is a reciprocating type compressor with 2 or more pistons

8: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant

  • shall have a pressure limiting device installed on the high side of the system
  • shall be inspected by the Boiler of Inspectors bi-annually
  • does not require a pressure-limiting device
  • shall have a pressure limiting device and a pressure relief valve installed

9: Viscosity is

  • a measure of heat content
  • the coefficient of external friction
  • the ability of oil to flow
  • measure of weight

10: What happens after your initial inspection of a pressure vessel?

  • There is a temporary shut-down until a final inspection can be performed.
  • Inspector leaves a metal tag with a certification listed on it
  • Notify the Fire Marshal that the system has been inspected and approved
  • Notify the AHJ to let them know that the system been inspected

11: A check valve is a device

  • designed to allow the flow of refrigerant gas in both directions
  • that is always spring loaded
  • with a pressure drop
  • found on high pressure steam systems

12: The best way to determine the voltage requirement for an electrical component is to

  • read the voltage with a mulitmeter
  • read the nameplate data
  • check with the utility company
  • determine the capacity of the service panel

13: Which refrigerant is lighter than air?

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

14: How many flammability classifications are refrigerants in?

  • 2
  • 5
  • 7
  • 3

15: What instrument is used to measure very high resistance?

  • voltmeter
  • meg ohmmeter
  • ammeter
  • tape measure

16: Whoever owns/uses a refrigeration or air conditioning system covered by this code

  • must notify the Department of Public Safety prior to starting the system
  • shall be licensed by the Commonwealth of Massachusetts according to CMR 522
  • shall make application for inspections to the Chief of Inspectors
  • None of the above

17: What pipe can not be used for refrigeration?

  • M
  • K
  • N
  • L

18: Which of the following controllers would you expect to be most sensitive to temperature changes?

  • immersion controller
  • aquastat
  • line voltage t-stat
  • low voltage t-stat

19: When should a relief valve start to function?

  • Before the purge station discharges
  • At it's set pressure
  • 10 psi before it's set pressure
  • Two times it's working pressure

20: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.

  • 90
  • 100
  • 110
  • 80

21: The two float-type metering devices are the

  • liquid float and the vapor float
  • vapor float and the low-side float.
  • high-side float and the low-side float
  • liquid float and the low-side float

22: Halogenated refrigerants cannot be used with what material?

  • Magnesium alloy
  • Aluminum
  • Copper
  • Stainless steel

23: 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

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

24: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.

  • True
  • False

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

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