Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Capacitors are rated in

  • megaohms
  • micro-farads
  • volt - amperes
  • kelvins

2: What is a Category "D" fluid?

  • 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
  • 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

3: What type of material can't be used on the outlet of a relief valve?

  • PVC
  • Copper
  • Stainless steel
  • Magnesium alloy

4: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.

  • shall be prohibited
  • shall not be prohibited
  • containing R-11, R-123 & R-717 exclusively shall not be prohibited
  • of Group B2 refrigerant shall be prohibited

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

  • gas
  • liquid
  • solid
  • All of the above

6: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.

  • HCFC-123
  • Lithium bromide
  • CFC-11
  • ammonia

7: On a pumpdown system, the liquid-line solenoid is controlled by the

  • low-ambient controller
  • low pressure switch
  • thermostat
  • defrost timer

8: Halo-carbon refrigerants cannot be used with what material?

  • Stainless Steel
  • Magnesium alloy
  • Aluminum
  • Copper

9: Name an HCFC refrigerant(s):

  • R-22
  • R-123
  • R-11
  • both a & b

10: NH3 is

  • R-718
  • lithium bromide
  • R-508A
  • ammonia

11: What kind of material can't be used on the outlet of a relief valve?

  • Copper
  • PVC
  • Stainless Steel
  • Aluminum

12: While the system is operating, the discharge line should be

  • 10-15F warmer than ambient
  • room temperature
  • too hot to hold by hand
  • at the same temperature as the crankcase

13: A High-Probablity system

  • is such that a leak of refrigerant from failed connections will enter the unoccupied space
  • 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 occupied space
  • is a system highly likely to leak from a failed connection or component of such system

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

  • 800F
  • 700F
  • 1000F
  • 600F

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

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

16: The most common type of motor starter is

  • delts-wye starter
  • duel-winding starter
  • part winding starter
  • across the line starter

17: A relief valve shall be located at least ___ above grade.

  • 10'
  • 25'
  • 15'
  • 36'

18: The heat picked up in the evaporator must equal to

  • the heat giving by the condenser
  • the heat gained by the condenser
  • the heat of compression
  • the heat lost by the medium being cooled

19: A 24 volt transformer with a 240 volt primary can handle how many amps?

  • There isn't enough information to answer.
  • 20 amps
  • 24 amps
  • 10 amps

20: The absorber shell contains the

  • condenser and the generator
  • condenser and the absorber
  • condenser, the evaporator, and the generator
  • evaporator and the absorber

21: What refrigerant were phased out in 2004?

  • R-134a
  • R-12
  • R-22
  • R-11

22: Systems containing more than 110 pounds must have stop valves located at the

  • compressor suction inlet
  • compressor discharge outlet
  • receiver inlet and outlet
  • All of the above

23: R-11 has the greatest corrosive effect on

  • Copper
  • Aluminum
  • Magnesium
  • Bronze

24: Which is considered the more efficient condenser?

  • water cooled
  • spray cooled
  • fan cooled
  • air cooled

25: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?

  • fusible plug
  • relief valve
  • rupture disc
  • all of the above