Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: In designing duct work, pressure and ______ need to be considered

  • length
  • CFM
  • duct sealant used
  • all of the above

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

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

3: Which of the following is an inorganic refrigerant?

  • R-22
  • Ammonia
  • Chlorofluorocarbons
  • All of the above

4: The location of the thermal bulb for the TXV on the evaporator effects

  • both the pressure and temperature in the feeler bulb
  • the amount of superheat required to operate the TXV
  • the amount of liquid in the evaporator
  • the amount of gas in the evaporator

5: Relief valves are rated in

  • gallons of water per hour
  • pounds of air per hour
  • gallons of water per minute
  • pounds of air per minute

6: The color code of a tank of ammonia is

  • lavender
  • light green
  • white
  • silver

7: 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.

  • 55
  • 50
  • 15
  • 75

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

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

9: RPM's of a centrifugal compressor are at approximately?

  • 500
  • 30,000
  • 15,000
  • 10,000

10: The measurement of heat in a particular substance is

  • specific heat
  • sensible heat
  • enthalpy
  • latent heat

11: Heat transferred by conduction from one body to another is done

  • via heat rays
  • via radiation
  • via liquids
  • via solids

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

  • 66
  • 45
  • 60
  • 38

13: When an A/C system is excessively low on refrigerant

  • it can become contaminated with water
  • there can be nuisance trip outs
  • the suction line may be too hot to touch
  • All of the above

14: How many forces operate a thermostatic expansion valve?

  • 3
  • 2
  • 1
  • 4

15: All electrical work done on refrigeration systems must comply with

  • OSHA
  • ASHREA-15 Section 9.2.1
  • NEC and Massachusetts Modifications
  • Department of Energy

16: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed

  • 660 lbs
  • 330 lbs
  • 55 lbs
  • 500 lbs

17: In an A/C unit, dirty filters will cause

  • high discharge pressure
  • low oil pressure
  • low suction pressure
  • high suction pressur

18: The normal operating evaporator temperature of R-410A for air conditioning is typically

  • 155F
  • 158F
  • 45F
  • 32F

19: "I" represents _______ in the Watt's law formula.

  • reactance
  • watts
  • amperage
  • voltage

20: What is used to check very low air pressures in air conditioning duct?

  • Vacuum gauge
  • Manometer
  • Anemomter
  • Barometer

21: R-12. R-22, and R-40 are considered Group I refrigerants.

  • True
  • False

22: Class A refrigerants are considered

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

23: If the power element on an expansion valve should lose its charge, the valve would

  • Under feed
  • Over feed
  • Close
  • Stay open

24: What chemical in the refrigerant set off the leak detection alarm?

  • Fluorine
  • Chlorine
  • Both A and B
  • none of the above

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

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