Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: 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

2: A chiller entering and leaving temperature difference is?

  • 20 degrees F
  • 10 degrees F
  • 50 degrees F
  • 5 degrees F

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

4: A pressure relief should be located at least _______ from windows and doors.

  • 15'
  • 20'
  • 30'
  • 25'

5: 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

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

6: The two basic types of evaporators are

  • direct expansion and plate
  • finned and plate
  • prime surface and finned
  • flooded and direct expansion

7: How many different groups of refrigerants are there?

  • 3
  • 15
  • 7
  • 11

8: At higher altitudes, boiling temperatures

  • decrease
  • increase
  • depends on the refrigerant
  • are unaffected

9: R-22 falls under which safety classification?

  • A-2
  • A-1
  • B-2
  • B-1

10: The External equalizer of a TXV compensates for

  • pressure within the system
  • pressure within the evaporator
  • pressure drop across the evaporator coil
  • pressure drop across the condenser coil

11: What is the refrigerant chlorodifluoromethane?

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

12: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with

  • R-718
  • ammonia
  • methyl chloride
  • trichlorotrifluoromethane

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

  • 1
  • 4
  • 3
  • 2

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

  • To chemical neutralizing tank only
  • Underground, into drain, into mechanical room
  • Atmosphere, Tank containing water, where the AHJ indicates.
  • None of the above.

15: A positive displacement compressor is

  • 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 volume of the compression chamber
  • is a reciprocating type compressor with 2 or more pistons
  • a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber

16: The normal operating evaporator temperature of R-410A for air conditioning is typically

  • 155F
  • 158F
  • 45F
  • 32F

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

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

18: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.

  • 80%
  • 75%
  • 99%
  • 90%

19: 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

20: A professional or office building would be considered what type of occupancy?

  • business
  • mercantile
  • commercial
  • public assembly

21: Megaohm meters can detect a ground in the

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

22: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code

  • competent welder
  • licensed welder
  • licensed technician
  • welder qualified

23: "R" represents ___ in the Ohm's law formula

  • resistance
  • voltage
  • amperage
  • capacitance

24: Crankcase heaters are energized

  • to allow easy compressor start-up
  • while the compressor is running
  • to prevent compressor freeze-up
  • when the compressor is off

25: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.

  • True
  • False