Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: 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

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

2: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are

  • sight glass, weight, paper method, and frost line.
  • Buss-eye, weight, pressure, and frost line
  • sight glass, weight, pressure, and dipstick
  • sight glass, weight, pressure, and frost line

3: 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

4: Increasing superheat will do what to your system?

  • Nothing
  • Decrease liquid flow
  • Increase liquid flow
  • Increase gas flow

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

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

6: Before you change the type of refrigerant in a refrigeration system, what three things must be done?

  • Nothing must be done
  • you can never change refrigerants
  • Place sign, check for leaks, and insulate suction line
  • Make sure its compatible, notify owner, and notify AHJ.

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

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

8: The main cause of enacting the "no vending rule" of July 1st 1992 was

  • global warming potential
  • ozone depletion
  • both a & b
  • None of the above

9: 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.

  • 50
  • 350
  • 550
  • 100

10: Class A refrigerants are considered

  • toxic
  • non-toxic
  • non-flammable
  • flammable

11: What was the main reason for enacting the no venting rule of July 1, 1992?

  • Ozone depletion
  • Green house effect
  • Global warming potential
  • All of the above

12: Heat transferred by conduction from one body to another is done via:

  • gas
  • liquid
  • solid
  • All of the above

13: It takes how many BTU/hr to melt one pound of ice at 32F

  • 212
  • 970
  • 144
  • 180

14: NH3 is

  • R-508A
  • lithium bromide
  • ammonia
  • R-718

15: What is not a requirement of a Class T machine room?

  • Tight fitting doors
  • Automatic ventilation
  • Self-closing doors
  • Fire hose connected to the building fire protection system.

16: The color code of a tank of ammonia is

  • white
  • light green
  • silver
  • lavender

17: What is a Category "M" fluid?

  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
  • Any fluid that exceeds 150 psig and has design temperatures over 366F
  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and the designed temperature is between -20F to 366F
  • A typical refrigerant used on newer air conditioning and heat pump systems

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

  • At 25% of its full rated speed
  • Start windings do no cut-out of the run cycle
  • At 75% of its full rated speed
  • At 50% of its full rated speed

19: Class T machine room

  • shall have remote controls to stop the action of the refrigerant compressor
  • has no flame producing apparatus permanently installed
  • shall include closets used for setting equipment
  • shall have refrigerant leak detecting systems installed inside and outside the room

20: If two 500 ohm resistors are connected in series, the resistance will be

  • 1000 ohms
  • 500 ohms
  • 20 ohms
  • 200 ohms

21: On a TXV, the purpose of an external equalizer is to?

  • balance the evaporator load
  • allow a greater adjustment spam
  • Increase the pressure on the top of the power head diaphragm
  • compensate for a pressure drop across the evaporator coil

22: The maximum permissible amperage draw for a 40VA transfomer with a secondary voltage of 24V is

  • 1.2
  • .8
  • 1.7
  • .1

23: How many square inches per square foot?

  • 144
  • 98
  • 24
  • 64

24: Ammonia can come in contact with _______ ?

  • Brass
  • Copper tubing
  • Copper
  • Aluminum

25: The Board of Boilers adopts by reference

  • MSCA Code
  • the MACS Pressure Vessel Code of Massachusetts
  • Montreal Protocol Safety Code
  • the 1997 ANSI/ASHRAE Safety Code