Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Methyl Chloride is a halogenated refrigerant and should not come in contact with

  • aluminum
  • zinc
  • magnesium
  • all of the above

2: The outer portion of shell of the compressor used on low-pressure chillers is called the

  • volute
  • baffle
  • nozzle
  • suction

3: R-22 is classified as a ____ refrigerant on the safety matrix.

  • B-2
  • A-1
  • B-1
  • A-2

4: Pi equals approximately

  • 746
  • 3.41
  • 12,000
  • 3.14

5: The density of a gas refers to

  • pounds per square foot
  • pounds per cubic foot
  • cubic feet per pound
  • pounds per absolute pressure

6: Name a CFC refrigerant(s):

  • R-11
  • R-12
  • R-123
  • both a & b

7: Class T machine room

  • shall have refrigerant leak detecting systems installed inside and outside the room
  • has no flame producing apparatus permanently installed
  • shall include closets used for setting equipment
  • shall have remote controls to stop the action of the refrigerant compressor

8: R-123 belongs to Group

  • B-1
  • B-3
  • A-3
  • B-2

9: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the

  • low side of the system
  • high side float assembly
  • cap tube
  • none of the above

10: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.

  • 25
  • 20
  • 10
  • 15

11: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.

  • 15
  • 10
  • 24
  • 18

12: High pressure controls should be set no higher than

  • 10% of set point
  • 25% of set point
  • 90% of set point
  • 80% of set point

13: Heat is a form of

  • energy
  • work
  • power
  • matter

14: The gauge thickness required on a CO2 tank construction is

  • 1/8"
  • 5/16"
  • 1/16"
  • 3/32"

15: When a refrigerating machinery room is used, the emergency procedures shall be posted

  • inside the room, immediately adjacent to each door
  • on a conspicuous card located near the compressor
  • outside the room, immediately adjacent to each door
  • on a conspicuous card located near the evaporator

16: A high side float is a

  • metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
  • float type valve that controls the crankcase oil level
  • float type valve that controls the amount of refrigerant stored in the receiver
  • float type switch that stops the compressor when the pressure on the high side becomes too high

17: Pressure vessels of 10 cubic feet or more gross volume shall use

  • at least one rupture member
  • a dual pressure-relief valve if charging into the atmosphere
  • at least three means of discharge and/or rupture discs
  • both a and b are correct

18: A start capacitor in series with a start winding will

  • decrease the amp draw of the motor
  • increase running efficiency
  • increase starting torque
  • increase the amp draw of the motor

19: A direct system

  • is on where brine is cooled & circulated to the space refrigerated
  • is one which encloses a separate body of evaporative refrigerant
  • is where the refrigerant comes in contact with the space refrigerated
  • is a self-contained complete factory made and tested system

20: Pressure vessels with an internal volume of 3 cubic feet or less

  • shall use pressure relief devices
  • do not need pressure relief protection
  • shall use pressure relief devices or fusible plugs
  • shall use fusible plugs

21: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 50
  • 22
  • 33
  • 18

22: Color is important in oil because

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

23: Class 3 refrigerants are

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

24: An air conditioning system rated for 36,000 BTU's is equivalent to

  • two tons of cooling
  • one ton of cooling
  • 12,000 tons of cooling
  • three tons of cooling

25: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.

  • high pressure
  • low pressure
  • critical pressure
  • design pressure