Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A run capacitor is wired in series with the _____ windings.

  • run
  • start
  • start capacitor
  • common

2: Usually dry bulb temperature is

  • same as wet bulb temperature
  • not important and shall be ignored
  • lower than dry bulb temperature
  • higher than wet bulb temperature

3: How many closing forces operate a thermostatic expansion valve?

  • 2
  • 1
  • 3
  • 4

4: What type of relief valve is used on low pressure centrifugal compressor systems?

  • Spring-loaded relief valve
  • Rupture disc
  • Purge relief
  • None of the above

5: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.

  • color-coded glass to determine type of refrigerant
  • moisture indicators
  • automatic closing shut-off valves
  • All of the above

6: Who authorizes changes to the safety codes?

  • Person who pulled the permit
  • Person in charge of the facility
  • Board of Boilers
  • Contractor who last serviced the system.

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

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

8: What is a Category "D" fluid?

  • 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
  • Any fluid that exceeds 150 psig and has design temperature of over 366F

9: If the power element on an expansion valve should lose its charge, the valve would

  • Close
  • Stay open
  • Over feed
  • Under feed

10: 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

11: What is the maximum voltage range allowed on an electrical circuit?

  • 20%
  • 5%
  • 10%
  • 15%

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

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

13: The solution that leaves the concentrator in an absorption chiller is referred to as the

  • absorbed solution
  • weak solution
  • strong solution
  • diluted solution

14: Before replacing a seized compressor, the _______ should be determinded.

  • cause of seizure
  • current draw
  • type of refrigerant
  • designed head pressure

15: Which occupancy can ammonia be used in?

  • commercial
  • depends on the quantity of freon
  • redifential
  • industrial

16: Dew point is

  • the temperature of air of 50% RH
  • the temperature below which water vapor in the air will start to evaporate
  • the temperature above which water vapor in the air will start to condense
  • the temperature below which water vapor in the air will start to condense

17: Megaohm meter's main function is

  • to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
  • to detect very high resistances to ground of refrigeration or air conditioning compressors
  • to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
  • Both a and b are correct

18: Low-side system leaks in a low-pressure chiller will often result in

  • nitrogen leaking out of the system.
  • air being pulled into the system
  • water being pulled into the system
  • system refrigerant leaking from the system

19: A solder joint melts at temperatures of

  • 1,200F to 1,500F
  • less than 400F
  • 400F to 800F
  • 600F to 900F

20: On a single phase motor, when does the start winding cut out?

  • 50% of its RLA speed
  • 75% of its RLA speed
  • 100% of its RLA speed
  • 25% of its RLA speed

21: What is the refrigerant chlorodifluoromethane?

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

22: Megaohm meters can detect a ground in the

  • 10,000,000 ohms or higher
  • up to 1,000,000 ohms
  • up to 10,000 ohms
  • up to 1,000 ohms

23: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into

  • the low-pressure side of the system
  • the high side of the system
  • the liquid receiver
  • both a and c are correct

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

  • A-3
  • C-3
  • B-2
  • A-1

25: How many opening forces operate a thermostatic expansion valve?

  • 4
  • 2
  • 1
  • 3