Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: 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

2: What must be done to refrigerant pipes before being buried ?(8.10.4)

  • Leak checked
  • Insulated and installed in a pipe duct (Encased)
  • Classifed
  • Certified

3: How many flammability classifications are refrigerants in?

  • 2
  • 7
  • 5
  • 3

4: Which occupancy can ammonia be used in?

  • redifential
  • depends on the quantity of freon
  • industrial
  • commercial

5: If a low-pressure chiller has a low-side leak, which of the following will most likely result?

  • Low suction pressure and low discharge pressure
  • High head pressure and low suction pressure
  • High suction pressure and high discharge pressure.
  • Low head pressure and high suction pressure

6: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.

  • 10
  • 18
  • 15
  • 24

7: On a centrifugal compressor, stationary diffuser vanes are needed to

  • stop gas flow
  • increase the clearance space
  • prevent high pressure on the packing
  • convert velocity energy to pressure

8: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.

  • 550
  • 350
  • 100
  • 50

9: What must be done to refrigerant pipes before being buried?

  • Certified
  • Leaked checked
  • Encased
  • Coated

10: The start winding has _____ turns than the run winding.

  • more
  • less
  • the same
  • none of the above

11: While water is evaporated in an evaporative condenser the impurities which were in the water are

  • remain in the air
  • blown to the atmosphere by the fan
  • washed out of the air by the spray pump
  • accumulate in the sump water

12: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?

  • Nesting scrolls
  • Fan-like action
  • Suction and discharge valves
  • Rotating vanes

13: A direct system

  • is a self-contained complete factory made and tested system
  • is on where brine is cooled & circulated to the space refrigerated
  • is one which encloses a separate body of evaporative refrigerant
  • is where the refrigerant comes in contact with the space refrigerated

14: Halogenated refrigerants cannot be used with what material?

  • Magnesium alloy
  • Aluminum
  • Stainless steel
  • Copper

15: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?

  • 746 watts
  • 600 watts
  • 1000 watts
  • 5KW

16: What is the amp draw of a 40 VA transformer at 24 volts

  • 1,000 amps
  • 1.6 amps
  • 1K amps
  • 106 amps

17: The certificate of inspection

  • shall be $20 and an additional fee of $1 for each tone above 20 tons
  • shall be authorized by a notarized insurance company
  • shall be posted on the compressor shell or electrical panel at the unit
  • shall be posted and protected from dirt, water, and other elements

18: The proper location for an oil separator is between the

  • evaporator and compressor
  • compressor and condenser
  • receiver and metering device
  • condenser and receiver

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

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

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

  • 155F
  • 32F
  • 158F
  • 45F

21: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?

  • Stop valve
  • Foot valve
  • Moisture indicator
  • Muffler

22: No open flames are allowed in the machinery room unless?

  • Approved by the authorized person
  • Never can be allowed
  • Approved by the installing contractor
  • Only when combustion air is provided from outside of the machinery room

23: When air is ducted through a machine room that services occupied space, What must be done?

  • Ducted and sealed
  • Welded and seamed.
  • Flanged and gasketed
  • Insulated and cross broke

24: Oils, classified as to source, are

  • naphthalene, mixed, and paraffin
  • animal, vegetable, and mineral
  • naphthalene, paraffin, and castor
  • animal, vegetable, and castor

25: A relief valve discharge capacity is rated in

  • temperature minus pounds of air per second divided by release rate squared
  • PSIG
  • PSIA
  • Pounds of air per minute.