Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Which has more turns in the windings: Start windings or Run windings?

  • Start windings
  • Run windings
  • They both have the exact same turns
  • Depends on the system and capacitor used

2: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?

  • 104 ohms
  • 71 ohms
  • 27 ohms
  • 80 ohms

3: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are

  • sight glass, weight, pressure, and frost line
  • sight glass, weight, paper method, and frost line.
  • sight glass, weight, pressure, and dipstick
  • Buss-eye, weight, pressure, and frost line

4: A rule of thumb in air conditioning is ____ CFM per ton?

  • 100
  • 600
  • 500
  • 400

5: If a condenser is on a roof and the temperature is 35F and dropping the capacity

  • run as designed with low ambient controls
  • increases
  • doesn't change
  • decreases

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

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

7: A direct system

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

8: Industrial occupancy is

  • a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
  • is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
  • a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
  • Both a and b are correct

9: What must be done to all doors and access points in duct work going through a mechanical room?

  • Must be hindged
  • Must be screwed shut
  • Must be sealed and gasketed
  • All of the above

10: High pressure controls should be set no higher than

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

11: 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

12: The solution that is pumped into the concentrator in an absorption chiller is referred to as the

  • concentrated solution
  • absorbed solution
  • weak solution
  • strong solution

13: Where are the three places that the discharge from an ammonia relief valve be piped?

  • To chemical neutralizing tank only
  • Underground, into drain, into mechanical room
  • Atmosphere, Tank containing water, where the AHJ indicates.
  • None of the above.

14: What is the refrigerant chlorodifluoromethane?

  • R-22
  • R-134a
  • R-12
  • R-123

15: What type of fuses must be used on a HVAC system?

  • TR Type, Duel Element, Time Delay
  • Fast blow
  • 10% lower than RLA
  • none of the above

16: On a day with low relative humidity, the two thermometers on a sling psychrometer will read

  • far apart or greater difference
  • nearly the same
  • 2F difference
  • a ling psychrometer doesn't have two theremometers.

17: What is a Category "D" fluid?

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

18: Who approves containers for refrigerants?

  • D.O.T
  • D.O.D
  • D.O.E
  • E.P.A

19: The evaporator is a device to

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

20: While water is evaporated in an evaporative condenser the impurities which were in the water are

  • washed out of the air by the spray pump
  • accumulate in the sump water
  • remain in the air
  • blown to the atmosphere by the fan

21: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of

  • the high side
  • 2.5 times the design pressure
  • the aggregate of the high side and low side
  • the low side

22: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?

  • Flush with ammonia
  • Flush with R-718
  • Flush with RX-11
  • Flush with R-11

23: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?

  • A group sensing
  • refrigerant sensing
  • CO Sensing
  • phosgene gas sening

24: 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.

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

  • amperage
  • voltage
  • reactance
  • watts