Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A single pole-double throw switch uses how many wires?(excluding the ground)

  • 2
  • 3
  • 5
  • 4

2: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 50
  • 66
  • 25
  • 22

3: What type of copper is not permitted on refrigeration systems?

  • Type N
  • Type K
  • Type M
  • Type L

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

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

5: Systems containing more than 110 pounds must have stop valves located at the

  • compressor suction inlet
  • compressor discharge outlet
  • receiver inlet and outlet
  • All of the above

6: How far from the ground does a relief valve need to be?

  • At least 15' above grade
  • Not more than 3' above grade
  • At least 25' above grade
  • At least 20' above grade

7: Heat that changes the physical state of a substance without effecting a change in its temperature is known as

  • sensible heat
  • lost heat
  • specific heat
  • latent heat

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

  • mercantile
  • public assembly
  • business
  • commercial

9: Pressure vessels with an internal volume of 3 cubic feet or more

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

10: When can recovered refrigerants be reused?

  • They can't
  • Only when used in original owner's equipment
  • Only if used in 30 days of recovery
  • None of the above

11: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a

  • commercial occupancy
  • public assembly occupancy.
  • mercantile occupancy
  • business occupancy

12: In a motor, an internal overload might open if

  • there's an open start winding
  • there was a high pressure refrigerant was used for a low pressure system.
  • there's a direct short
  • there's an excess current draw through the motor

13: All machine rooms must be outfitted with a detector that _______?

  • activates an audible alarm
  • activates a visual alarm
  • starts the ventilation system
  • All of the above

14: 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.

  • 100
  • 50
  • 350
  • 550

15: A machine room with a refrigerant system using ammonia shall

  • be provided with a continuously operated ventilation system
  • be considered a non-hazardous location in accordance with National Electrical code
  • have no flame producing apparatus permanently installed and operated
  • All of the above

16: Cooling tower lowers condenser water temp by

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

17: A secondary coolant is defined as

  • any liquid used for the transmission of heat without a change of state in A/C refrigeration systems having flash point above 150F
  • any refrigerant direcly in contact with the cooling space for process cooling
  • a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
  • a low temperature refrigerant used for cascading systems

18: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?

  • Electricity
  • Air
  • Heat
  • Oil

19: The Board of Boilers adopts by reference

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

20: Absolute pressure is

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

21: Sensible heat is the heat added to a substance to

  • change its state
  • cause evaporation
  • raise its temperature
  • freeze it

22: A capacitor in series with the start windings will do what?

  • Increase starting torque
  • Nothing
  • Decrease the RLA to within 10% of its rating
  • Increase run efficiency by 10% of its rating

23: Which refrigerant(s) is an HFC?

  • R-22
  • R-410A
  • R-502
  • All of the above

24: What's the purpose of a megohmmeter?

  • To measure low to very low resistance values
  • To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
  • To measure very high resistances
  • None of the above

25: On cooling towers, what causes the condenser water to drop

  • tower fans
  • ambient temperatures
  • sensible heat
  • evaporation of the water droplets