Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

  • 60
  • 66
  • 45
  • 38

2: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.

  • 7.00'
  • 7.25'
  • 8'4"
  • 9.00'

3: A compressor that increases vapor pressure by changing the internal volume of the compression chamber is called?

  • Positive displacement
  • Low Pressure displacement
  • Non-positive displacement
  • Pressure induced displacement.

4: A tachometer is an instrument used to measure

  • speed
  • air velocity
  • static pressure
  • RPM

5: The Board of Boilers adopts by reference

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

6: 14.7 psia is equivalent to

  • atmospheric pressure at seal level
  • 29.92" Hg
  • 0 psig
  • All of the above.

7: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?

  • Muffler
  • Moisture indicator
  • Foot valve
  • Stop valve

8: A R-410A system running with a condensing temperature of 110F and 50F 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
  • 365 psig, 120 psig

9: The first step in mechanical refrigeration is

  • expansion
  • compression
  • evaporation
  • condensation

10: There can be no airflow from an occupied space through a machine room unless what?

  • System is high velocity
  • System is ducted and sealed
  • Duct is not located in the ceiling
  • None of the above.

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

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

12: A normal operating evaporator temperature of R-22 for air conditioning is typically

  • 32F
  • 58F
  • 45F
  • 55F

13: Trichlorofluoromethane is the name of what refrigerant?

  • R-502
  • R-11
  • R-12
  • R-113

14: 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

15: What effect does the temperature of air have on humidity?

  • warmer air holds more moisture then cooler air
  • cooler air holds more moisture then warmer air
  • air has no effect of humidity
  • none of the above

16: What is the minimum height refrigeration piping should be placed against walls?

  • 72"
  • 6'
  • Ceiling height
  • 7.25'

17: What is potential measured in?

  • Ohms
  • Henrys
  • Volts
  • Amps

18: A class B2 refrigerant is considered

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

19: Pressure vessels with an internal volume of 10 cubic feet or more

  • shall use pressure relief devices or fusible plugs
  • shall use pressure relief devices
  • shall use rupture discs or duel pressure relief valves
  • shall use fusible plugs

20: When an inspection is needed, how often must it be done?

  • every 24 months
  • every 36 months
  • every 18 months
  • annually

21: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?

  • A group sensing
  • phosgene gas sening
  • CO Sensing
  • refrigerant sensing

22: On a centrifugal compressor, stationary diffuser vanes are needed to

  • increase the clearance space
  • convert velocity energy to pressure
  • stop gas flow
  • prevent high pressure on the packing

23: An oil pressure safety switch should be set at

  • 5 to 10 psi above low side pressure
  • 5 to 10 psi below low side pressure
  • 10 to 15 psi below low side pressure
  • 10-15 psi above low side pressure

24: A relief valve discharge capacity is rated in

  • temperature minus pounds of air per second divided by release rate squared
  • PSIG
  • PSIA
  • Pounds of air per minute.

25: How is bring measured?

  • manometer
  • hygrometer
  • hydrometer
  • anemometer