Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?

  • Flush with R-11
  • Flush with ammonia
  • Flush with R-718
  • Flush with RX-11

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

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

3: The amount of heat required to raise the temperature of 1 lb of water 1F is?

  • 1 Therm
  • 1 Kelvin
  • The rate of conduction
  • 1 BTU

4: R-22 is considered a(n)

  • CFC
  • HCFC
  • HCFCH
  • HFC

5: 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

6: The instrument used to measure the specific gravity of absorption chiller solutions is the

  • anemometer
  • hydrometer
  • Psychrometer
  • refractometer

7: Pipe identification labels are required when the system contains more than

  • 55 lbs
  • 110 lbs
  • 120 lbs
  • 65 lbs

8: What instrument is used to measure very high resistance?

  • meg ohmmeter
  • voltmeter
  • tape measure
  • ammeter

9: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of

  • the ASME Boiler and Pressure Vessel Code
  • Section 11.3.1.5 ASHRAE 15 Standard
  • the ANSI Standard 10.7.2
  • both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5

10: Which creates more of a heat load?

  • 90% RH
  • 30% RH
  • 50% RH
  • 70% RH

11: What kind of material can't be used on the outlet of a relief valve?

  • PVC
  • Aluminum
  • Stainless Steel
  • Copper

12: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.

  • 3.0, 3.5
  • 2.5, 2.5
  • 6.6, 6.6
  • 2.5, 3.0

13: Trichlorofluoromethane is the name of what refrigerant?

  • R-11
  • R-113
  • R-502
  • R-12

14: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.

  • 2.0
  • 5.5
  • 2.5
  • 3.0

15: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with

  • methyl chloride
  • ammonia
  • R-718
  • trichlorotrifluoromethane

16: What happens after your initial inspection of a pressure vessel?

  • There is a temporary shut-down until a final inspection can be performed.
  • Notify the Fire Marshal that the system has been inspected and approved
  • Inspector leaves a metal tag with a certification listed on it
  • Notify the AHJ to let them know that the system been inspected

17: A class B1 refrigerant is considered

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

18: Ammonia (NH3) is a group III refrigerant

  • True
  • False

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

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

20: The Department that certifies the transportation of refrigerant is the

  • EPA
  • EPO
  • RSES
  • DOT

21: Dual-pressure relief devices should be installed on

  • vessels of 3 cubic feet or less
  • vessels of 10 cubic feet or less
  • vessels of 10 cubic feet or more
  • vessels of 3 cubic feet or more

22: What is potential measured in?

  • Volts
  • Ohms
  • Henrys
  • Amps

23: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?

  • When it's used as part of a supply or return air system
  • When there are sprinklers above
  • When there is a space 6' or more above it
  • When its white

24: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit

  • 9.776 watts
  • 977.6 watts
  • .9776 watts
  • 9,776 watts

25: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?

  • 144 BTU
  • 24,000 BTU
  • 970 BTU
  • 12,000 BTU