Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: _____ alloys shall not be used in contact with an halogenated refrigerants.

  • Zinc
  • Nickel
  • Magnesium
  • Copper

2: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.

  • 5
  • 2
  • 3
  • 1

3: A High-Probability System

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

4: By using nitrogen within a pipe during brazing operation,

  • The explosion hazard is confined
  • Exterior scale formation is minimized
  • Discoloration is prevented
  • Copper oxide formation is prevented

5: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?

  • 746 watts
  • 1000 watts
  • 600 watts
  • 5KW

6: Which is the lowest vacuum?

  • 10 psia
  • 1,000 Microns
  • 5" hg
  • 5 psig

7: If a low-pressure chiller has a low-side leak, which of the following will most likely result?

  • Low suction pressure and low discharge pressure
  • Low head pressure and high suction pressure
  • High suction pressure and high discharge pressure.
  • High head pressure and low suction pressure

8: A start capacitor is wired in _____ with the start windings.

  • parallel
  • junction
  • series
  • series-parallel

9: A moisture indicator must

  • be sight side up
  • be filled with liquid
  • change color when exposed to moisture
  • be yellow

10: Low pressure chiller systems use what type of compressor?

  • Scroll
  • Screw
  • Centrifugal
  • Reciprocating

11: What pipe can not be used for refrigeration?

  • N
  • L
  • K
  • M

12: A solder joint melts at temperatures of

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

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

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

14: How many refrigerant classifications are there for toxicity?

  • 5
  • 3
  • 1
  • 2

15: When using nitrogen for brazing, the pressure should be:

  • 50-100 psig
  • 125 psig
  • Slightly below atmospheric
  • Very low

16: A split-phase motor has a ______ winding and a ____ winding

  • start, common
  • run, common
  • run, start
  • duel-run, duel-start

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

  • 180
  • 970
  • 212
  • 144

18: Which winding have the most turns?

  • Start
  • depends on the motor phase
  • run
  • they have equal amount of turns

19: How are safety controls wired in a circuit?

  • Series
  • Series/parallel
  • Either series or parallel
  • Parallel

20: What effect does the temperature of air have on humidity?

  • warmer air holds more moisture then cooler air
  • cooler air holds more moisture then warmer air
  • air has no effect of humidity
  • none of the above

21: What is the refrigerant chlorodifluoromethane?

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

22: When an inspection is needed, how often must it be done?

  • every 36 months
  • every 18 months
  • annually
  • every 24 months

23: "I" represents ____ in the Ohm's law formula.

  • capacitance
  • resistance
  • amperage
  • voltage.

24: Where would the EPR valve be located on a multiple evaporator system?

  • outlet of the liquid line
  • inlet of the low temperature evaporator.
  • outlet of low temperature evaporator
  • outlet of high temperature evaporator

25: The color code of a tank of ammonia is

  • silver
  • light green
  • white
  • lavender