Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A device used to measure small pressure differences is the

  • anemometer
  • phsycometirc
  • pyrometer
  • manometer

2: Doors communicating with outside from a mechanical room must be?

  • Steel, approved, weather-stripped
  • Self-closing, approved, fire door
  • Self-closing, aligned, fire door
  • Self-closing, wooden, fire door

3: One atmosphere equals

  • 0 psig
  • 14.7
  • 29.4
  • 0 psia

4: Class 3 refrigerants are

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

5: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.

  • 75
  • 50
  • 15
  • 55

6: What measures gas pressure?

  • Manometer
  • Barometer
  • Hygrometer
  • Hydrometer

7: Where must a refrigeration contractor's license number be displayed?

  • Trucks, invoices, and advertising
  • Uniforms, checks, and invoices.
  • Trucks, license plates, and uniforms
  • Truck, office, every job, and on all equipment

8: How many different groups of refrigerants are there?

  • 3
  • 11
  • 7
  • 15

9: Three-phase motors have what type of windings?

  • three run windings
  • one start winding and one run winding.
  • three start windings
  • three run windings and 3 start windings

10: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?

  • 20 amps
  • 15 amps
  • 10 amps
  • 5 amps

11: R-410A can segregate in the system or chemically change its composition due to a leak.

  • True
  • False

12: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)

  • Pressure gauge
  • Temperature gauge
  • Sight glass gauge
  • All of the above

13: The leaving chilled water set point for comfort cooling is typically?

  • 60
  • 38
  • 45
  • 66

14: By using nitrogen within a pipe during brazing operation,

  • The explosion hazard is confined
  • Discoloration is prevented
  • Exterior scale formation is minimized
  • Copper oxide formation is prevented

15: How many forces operate a thermostatic expansion valve?

  • 2
  • 3
  • 1
  • 4

16: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?

  • checking the level of refrigerant in the system
  • testing for oil in the system
  • testing for moisture in the system
  • none of the above

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

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

18: Industrial occupancy is

  • a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
  • is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
  • a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
  • Both a and b are correct

19: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.

  • 80%
  • 99%
  • 90%
  • 75%

20: Which refrigerant class listed below is the most flammable?

  • B2
  • A3
  • A2
  • C3

21: "I" represents ____ in the Ohm's law formula.

  • amperage
  • voltage.
  • resistance
  • capacitance

22: Refrigerants shall be classified by

  • toxicity and flammability
  • maximum permissible quantities of each group
  • color codes
  • requirements for commercial, industrial, and residential occupancies

23: Which oil is hydoscopic?

  • SW30
  • animal
  • mineral
  • polyolester

24: The high side float assembly meters refrigerant into the evaporator through the

  • lower chamber of the low side
  • upper chamber of the low side
  • lower chamber of the high side
  • upper chamber of the high side

25: Capacity control on a centrifugal compressor is accomplished by the

  • check valves
  • pre-rotational guide vanes
  • slide vanes
  • post-rotational guide vanes