Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?

  • 240v
  • 208v
  • 120v
  • 277v

2: In a low temperature refrigeration system, the benefit of the system using P.A.G. oil is

  • it is hydroscopic
  • it traps moisture
  • viscosity
  • all of the above

3: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere

  • 110
  • 1,000
  • 330
  • 6.6

4: When energized, a normally open relay will be

  • depends on the type and class of the relay
  • open
  • noisy
  • closed

5: "E" represents _____ in the Watt's law formula.

  • amperage
  • reactance
  • watts
  • voltage

6: A class B1 refrigerant is considered

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

7: Name an HCFC refrigerant(s):

  • R-22
  • R-123
  • R-11
  • both a & b

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

  • business
  • commercial
  • public assembly
  • mercantile

9: Institutional occupancy is

  • a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
  • a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
  • a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
  • None of the above

10: The difference between saturated liquid and saturated vapor is

  • temperature
  • heat
  • volume
  • pressure

11: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.

  • 100
  • 400
  • 250
  • 350

12: Pressure vessels with an internal volume of 3 cubic feet or less

  • shall use pressure relief devices or fusible plugs
  • do not need pressure relief protection
  • shall use fusible plugs
  • shall use pressure relief devices

13: The two float-type metering devices are the

  • vapor float and the low-side float.
  • liquid float and the low-side float
  • high-side float and the low-side float
  • liquid float and the vapor float

14: Oils, classified as to source, are

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

15: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is

  • run voltage
  • lift voltage
  • boost voltage
  • pick-up voltage

16: When a refrigeration or air conditioning system is installed

  • the form of certificate shall be authorized by the Department of Pubic safety
  • it shall be approved by the owner for proper operation.
  • it shall not be operated below prescribed pressures
  • a field inspection shall be made before it is put into service

17: The heat picked up in the evaporator must equal to

  • the heat of compression
  • the heat gained by the condenser
  • the heat lost by the medium being cooled
  • the heat giving by the condenser

18: An air conditioning system rated for 36,000 BTU's is equivalent to

  • 12,000 tons of cooling
  • one ton of cooling
  • two tons of cooling
  • three tons of cooling

19: The External equalizer of a TXV compensates for

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

20: What refrigerant were phased out in 2004?

  • R-134a
  • R-11
  • R-12
  • R-22

21: What is Absolute Zero?

  • -400F
  • -773F
  • -460F
  • -640F

22: A motor starter is a device that includes an overload and a _______?

  • contactor
  • 2-pole contacts
  • duel-coil
  • all of the above

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

  • 1
  • 2
  • 4
  • 3

24: Absolute pressure is

  • Gauge Pressure
  • Atmospheric Pressure
  • Gauge + Atmospheric Pressure + Pi
  • none of the above

25: Which oil is hydoscopic?

  • mineral
  • polyolester
  • SW30
  • animal