Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Ohm's Law indicates Amps X Resistance = ___________.

  • Ohms
  • Impedance
  • Volts
  • Current

2: 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
  • reset the expansion valve
  • start the fan and circulating pump
  • start the comrpessor

3: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is

  • drawing RLA and is running as it should
  • drawing LRA and is seized and should be replaced.
  • running hot
  • none of the above

4: Watt's Law indicates Volts X Amps = _________.

  • Ohms
  • Watts
  • Current
  • Resistance

5: The boiling point of a refrigerant is based on

  • Temperature
  • Heat content
  • a pressure-temperature relationship
  • None of the above.

6: What section governs pressure vessels?

  • Section 8 ASHREA 15 ASME unfired
  • Section 1 ASHREA 15 ASME fired
  • Section ASHREA 34
  • OSHA

7: What is the refrigerant dichlorodifluoromethane?

  • R-134A
  • R-22
  • R-12
  • R-123

8: Suction valve unloaders afford an effective means of

  • evaporator control
  • superheat control
  • capacity control
  • refrigerant control

9: How much clearance do you need around the perimeter of electrical panels?

  • 12"
  • 36"
  • 18"
  • 24"

10: Name a CFC refrigerant(s):

  • R-11
  • R-12
  • R-123
  • both a & b

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

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

12: Which is the lowest vacuum?

  • 5 psig
  • 10 psia
  • 1,000 Microns
  • 5" hg

13: A positive displacement compressor is

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

14: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.

  • 15
  • 50
  • 20
  • 75

15: Adjusting the spring pressure on a TXV

  • makes no difference
  • changes subcooling
  • adjusts the bulb charge
  • changes superheat

16: The gauge thickness required on a CO2 tank construction is

  • 1/16"
  • 1/8"
  • 3/32"
  • 5/16"

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

  • gas
  • liquid
  • solid
  • All of the above

18: What is a Category "M" fluid?

  • A typical refrigerant used on newer air conditioning and heat pump systems
  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
  • 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
  • Any fluid that exceeds 150 psig and has design temperatures over 366F

19: How many refrigerant classifications are there for toxicity?

  • 5
  • 3
  • 2
  • 1

20: _____ alloys shall not be used in contact with an halogenated refrigerants.

  • Magnesium
  • Zinc
  • Nickel
  • Copper

21: The generator shell contains the

  • condenser and the generator
  • condenser and the absorber
  • condenser, the evaporator, and the generator
  • evaporator and the absorber

22: Trichlorofluoromethane is the name of what refrigerant?

  • R-11
  • R-113
  • R-12
  • R-502

23: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.

  • 455 psig, 185 psig
  • 257 psig, 77 psig
  • 226 psig, 68 psig
  • 350 psig, 120 psig

24: The 522 CMR 9.00 has adopted for reference ASHRAE ____

  • 25
  • III
  • 10
  • 15

25: Transformers are rated in

  • amps
  • volt-amps
  • volts
  • volts-ohms