Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A class A3 refrigerant is considered

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

2: Machinery rooms must be vented to ______?

  • neutralizing tank
  • basement
  • outdoors
  • unoccupied spaces

3: The critical temperature of a refrigerant gas occurs when

  • any decrease in pressure will cause condensation
  • the gas is no longer saturated
  • any increase in pressure will not liquefy the gas
  • the gas returns to a liquid

4: Pi equals approximately

  • 3.41
  • 3.14
  • 12,000
  • 746

5: Increasing superheat will do what to your system?

  • Decrease liquid flow
  • Increase gas flow
  • Increase liquid flow
  • Nothing

6: What will occur if the strong solution in an absorption chiller becomes too strong?

  • The machine will stop cooling and solution will crystallize
  • The machine will stop cooling and the solution will evaporate.
  • The machine will cool excessively as the solution evaporates
  • The machine will cool excessively as the solution crystallizes.

7: Control systems can be classified by

  • economy of operation
  • safety
  • tonnage of system
  • source of power

8: Can you use Ammonia in industrial applications?

  • Yes, always
  • Yes, Under certain condidtions
  • No, never
  • When mixed with R-718

9: Joints in piping for refrigeration containing parts must withstand temperatures of ___?

  • 800F
  • 1000F
  • 600F
  • 700F

10: Color is important in oil because

  • it indicates the viscoisty.
  • can tell us something about the refining of oil
  • allows you to see into crankcase
  • it makes sight glasses easy to read

11: Heat cannot of itself, pass from a

  • cold to a warmer body
  • warm to a colder body
  • state of hot energy to a state of cold energy
  • None of the above

12: Where a refrigeration or air conditioning system is installed,

  • A field inspection shall be made before it is put into service
  • the form or certificate shall be authorized by the Department of Public Safety
  • The company who installed the system must notify the fire department in the jurisdiction where installed
  • it shall not be operated below prescribed pressuers

13: Ammonia can come in contact with _______ ?

  • Copper tubing
  • Brass
  • Copper
  • Aluminum

14: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?

  • 1,000
  • 100,000
  • 10,000
  • 100

15: Pressure limiting devices are not required for systems containing less then ________ refrigerants.

  • 44 lbs
  • 22 lbs
  • 13.9 lbs
  • 6.6 lbs

16: Ammonia is under what safety classification?

  • A3
  • B2
  • B1
  • B3

17: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code

  • Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
  • over pressure protection
  • over pressure protection and a rupture disc
  • over pressure protection as well as a temperature protection device

18: Whoever owns/uses a refrigeration or air conditioning system covered by this code

  • must notify the Department of Public Safety prior to starting the system
  • shall be licensed by the Commonwealth of Massachusetts according to CMR 522
  • shall make application for inspections to the Chief of Inspectors
  • None of the above

19: How far from the window does a relief valve need to be according to ASHRAE-15?

  • At least 30'
  • There is no minimum for relief valve and windows.
  • At least 40'
  • At least 20'

20: High side floats are used on centrifugal chiller systems are are considered critically charged systems.

  • are obsolete.
  • False
  • depends on the type of refrigerant being used
  • True

21: What is the typical air conditioning operating pressures for 410A?

  • 60 psi suction, 210 psi discharge
  • 25 psi suction, 125 psi discharge
  • 105 psi suction, 350 psi discharge
  • None of the above

22: Suction valve unloaders afford an effective means of

  • evaporator control
  • superheat control
  • refrigerant control
  • capacity control

23: The evaporator is a device to

  • remove heat from the refrigeration system
  • absorb heat into the refrigeration system
  • store liquid refrigerant
  • Keep the compressor busy

24: How many different groups of refrigerants are there?

  • 7
  • 3
  • 11
  • 15

25: A room having machinery but no flame producing apparatus permanently installed and operated is considered a

  • Class T machinery room
  • Class B machinery room
  • Class M machinery room
  • Class A machinery room