Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The two float-type metering devices are the

  • liquid float and the low-side float
  • liquid float and the vapor float
  • vapor float and the low-side float.
  • high-side float and the low-side float

2: How are a compressor and condenser fan wired?

  • series
  • parallel
  • parallel-series
  • series-parallel

3: Humidity can be sensed with

  • thermometer
  • pressure bellows
  • bimetal
  • human hair

4: Calculate the voltage in a series circuit when the total amperage is 10 amps and the resistors have values of: R1=12 ohms, R2=8 ohms, R3=4 ohms

  • 24.0 volts
  • 2.40 volts
  • 240 volts
  • 2,400 volts

5: Absolute pressure is

  • Gauge Pressure
  • Atmospheric Pressure
  • Gauge + Atmospheric Pressure + Pi
  • none of the above

6: The freezing point of water at sea level is?

  • 32C
  • -10C
  • 32F
  • 0F

7: What is a Category "M" fluid?

  • A typical refrigerant used on newer air conditioning and heat pump systems
  • Any fluid that exceeds 150 psig and has design temperatures over 366F
  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and the designed temperature is between -20F to 366F
  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content

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

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

9: Fusible plugs shall not be used with pressure vessels of

  • 3 cubic feet or less
  • 15 cubic feet or more
  • 3 cubic feet or more
  • 15 square feet or less

10: It takes how many BTU/hr to melt one pound of ice at 32F

  • 970
  • 180
  • 212
  • 144

11: A High-Probablity system

  • is a system highly likely to leak from a failed connection or component of such system
  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is such that a leak of refrigerant from failed connections will enter the unoccupied space
  • is such that a leak of refrigerant from failed connections will enter the occupied space

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

  • B-1
  • A-1
  • A-2
  • B-2

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

  • 660 lbs
  • 55 lbs
  • 550 lbs
  • 330 lbs.

14: Suction line oil traps should be installed when the condenser is

  • on the third floor roof and the evaporator is in the basement
  • in the basement and the evaporator is on the third floor
  • located outside the operates in temperatures below 35F
  • more than 100' away from the evaporator

15: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)

  • illegal occupancy
  • public assembly occupancy
  • institutional occupancy
  • commercial occupancy

16: Viscosity is

  • a measure of heat content
  • measure of weight
  • the ability of oil to flow
  • the coefficient of external friction

17: 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

18: 746 watts is equal to

  • Pi
  • 1 hp
  • 100 hp
  • 10 hp

19: Heat is a form of

  • energy
  • work
  • matter
  • power

20: An azeotropic refrigerant is

  • a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
  • a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
  • a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
  • none of the above

21: The evaporator is a device to

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

22: 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

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

  • True
  • False

24: A compressor in which the increase in vapor pressure is attained without changing the internal volume of the compression chamber is called

  • non-positive displacement compressor
  • negative displacement compressor
  • non-volumetric displacement compressor
  • neutral chamber-type compressor

25: Stop valves shall not be permitted between the system and the

  • condenser
  • relief valve
  • bleed valve
  • service valve