Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into

  • the low-pressure side of the system
  • the high side of the system
  • the liquid receiver
  • both a and c are correct

2: By using nitrogen within a pipe during brazing operation,

  • Discoloration is prevented
  • The explosion hazard is confined
  • Copper oxide formation is prevented
  • Exterior scale formation is minimized

3: Low pressure systems have what kind of compressor?

  • Scroll
  • Centrifugal
  • Rotary
  • Reciprocating

4: What is the purpose of a surge capacitor on a contactor?

  • to protect low voltage equipment
  • to provide smoother start/stops
  • to balance the sine waves
  • to keep the contactor pulled in

5: A class B1 refrigerant is considered

  • non-toxic and non-flammable
  • non-toxic but highly flammable
  • toxic and somewhat flammable
  • toxic but non-flammable

6: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of

  • the ASME Boiler and Pressure Vessel Code
  • Section 11.3.1.5 ASHRAE 15 Standard
  • the ANSI Standard 10.7.2
  • both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5

7: A hissing noise at the expansion valve is a good indication that

  • expansion valve is oversized
  • gas is passing thru it
  • nothing is passing thru
  • liquid is passing thru it

8: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • UL and UM
  • UV or UR
  • UM or UL
  • UL and UR

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

  • 158F
  • 32F
  • 155F
  • 45F

10: The most common type of motor starter is

  • part winding starter
  • duel-winding starter
  • delts-wye starter
  • across the line starter

11: B3 refrigerants are considered

  • non-toxic but non-flammable
  • toxic but non-flammable
  • non-toxic but flammable
  • toxic and highly flammable

12: One ton of refrigeration is defined as ______ btu/minute.

  • 60
  • 12,000
  • 200
  • 720,000

13: A rule of thumb in air conditioning is ____ CFM per ton?

  • 400
  • 600
  • 100
  • 500

14: Each machinery room shall contain

  • a refrigerant detector located in an area where the refrigerant from a leak will concentrate
  • smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
  • high and low pressure controls
  • a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate

15: R-11 has the greatest corrosive effect on

  • Bronze
  • Copper
  • Aluminum
  • Magnesium

16: Increasing superheat will do what to your frost line?

  • Nothing
  • Decrease
  • Increasae
  • Could either increase or decrease depending on the load conditions

17: A solder joint melts at temperatures of

  • 600F to 900F
  • 400F to 800F
  • less than 400F
  • 1,200F to 1,500F

18: 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

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

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

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.

  • 80
  • 90
  • 100
  • 110

21: A 24 volt transformer with a 240 volt primary can handle how many amps?

  • 20 amps
  • There isn't enough information to answer.
  • 10 amps
  • 24 amps

22: Low ambient controls are used when

  • when systems run all year round
  • always
  • economizers are used
  • on air conditioning systems only

23: 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

24: How are a compressor and condenser fan wired?

  • parallel
  • parallel-series
  • series
  • series-parallel

25: Cooling tower lowers condenser water temp by

  • running water thru a secondary heat exchanger
  • running fans at 100%
  • condensation
  • evaporative cooling