Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A device used to measure small pressure differences is the

  • phsycometirc
  • pyrometer
  • anemometer
  • manometer

2: A pressure relief should be located at least _______ from windows and doors.

  • 25'
  • 15'
  • 30'
  • 20'

3: Which refrigerant class listed below is the most flammable?

  • A-1
  • C-3
  • B-2
  • A-3

4: A capacitor in series with the start windings will do what?

  • Increase starting torque
  • Increase run efficiency by 10% of its rating
  • Nothing
  • Decrease the RLA to within 10% of its rating

5: What is absolute humidity?

  • the amount of moisture in the air per one pound of 50% RH air
  • the amount of moisture in the air in grains of cubic feet of volume
  • the amount of moisture in the air in grains of square feet of volume
  • none of the above

6: What is not a requirement of a class T machine room?

  • fire hose connection to the building fire protection system
  • tight fitting doors
  • automatic ventilation
  • self-closing doors

7: A chiller entering and leaving temperature difference is?

  • 5 degrees F
  • 50 degrees F
  • 20 degrees F
  • 10 degrees F

8: On a centrifugal compressor, stationary diffuser vanes are needed to

  • increase the clearance space
  • convert velocity energy to pressure
  • prevent high pressure on the packing
  • stop gas flow

9: Sublimation occurs when

  • liquid is formed from a gas
  • gas is formed from a liquid
  • gas is formed directly from a solid
  • ice melts and turns to water

10: A class B1 refrigerant is considered

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

11: "R" represents ___ in the Ohm's law formula

  • resistance
  • capacitance
  • amperage
  • voltage

12: The Board of Boilers adopts by reference

  • MSCA Code
  • Montreal Protocol Safety Code
  • the 1997 ANSI/ASHRAE Safety Code
  • the MACS Pressure Vessel Code of Massachusetts

13: Which of the following most closely represents the concentration of Li-Br in a absorption system?

  • 60% Li-Br, 40% distilled water
  • 40% Li-Br, 60% tap water
  • 40% Li-Br, 60% distilled water
  • 50% Li-Br, 50% tap water

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

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

15: System design pressures must take into consideration, not only, pressures found during normal operation but also what?

  • When it's cold out
  • When there is a malfunction on the high side
  • When its warm out
  • All of the above

16: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?

  • R-718 is not rated unlimited because it's a dangerous refrigerant
  • Because it's cheap
  • Because it's a non-flammable refrigerant
  • Because it's water

17: Clearance volume

  • is the same on all compressors
  • has no effect on compressor capacity
  • varies depending on compressor speed
  • affects compressor capacity

18: What would be the classification for Stop & Shop grocery store?

  • Large mercantile
  • Industrial
  • Place of assembly
  • Instituional

19: Can you use Ammonia in industrial applications?

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

20: Defined process piping by code CMR (528)

  • Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
  • Any piping in an industrial space
  • Any piping in an industrial or commercial space
  • All of the above

21: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to

  • liquid line that is too small
  • shortage of refrigerant
  • liquid line that had too high vertical lift
  • All of the above

22: What type of voltage cause a potential relay to open?

  • 24 volt supply from the thermostat
  • 120 volt line voltage
  • Pick-up voltage
  • none of the above

23: How much clearance do you need around the perimeter of electrical panels?

  • 36"
  • 12"
  • 18"
  • 24"

24: A direct system

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

25: How many gallons of water do you need per pound of ammonia?

  • 10
  • 1
  • 50
  • 100