Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: At higher altitudes, boiling temperatures

  • increase
  • decrease
  • are unaffected
  • depends on the refrigerant

2: A machine room with a refrigerant system using ammonia shall

  • be provided with a continuously operated ventilation system
  • be considered a non-hazardous location in accordance with National Electrical code
  • have no flame producing apparatus permanently installed and operated
  • All of the above

3: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.

  • 455 psig, 185 psig
  • 350 psig, 120 psig
  • 257 psig, 77 psig
  • 226 psig, 68 psig

4: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of

  • low head pressure
  • oil in evaporator
  • moisture in the system
  • not enough oil in the system

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

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

6: A thermometer inside a duct measures ____ heat.

  • specific
  • hidden
  • latent
  • sensible

7: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.

  • 50
  • 100
  • 75
  • 24

8: Heat that changes the physical state of a substance without effecting a change in its temperature is known as

  • sensible heat
  • specific heat
  • lost heat
  • latent heat

9: A tachometer is an instrument used to measure

  • air velocity
  • speed
  • static pressure
  • RPM

10: Horizontal piping should be run level.

  • True
  • False
  • No, unless the supervisor on the job says so.
  • Yes, if the condenser is located above the evaporator

11: Pressure vessels of 10 cubic feet or more gross volume shall use

  • at least one rupture member
  • a dual pressure-relief valve if charging into the atmosphere
  • at least three means of discharge and/or rupture discs
  • both a and b are correct

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

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

13: A Low-Probability System

  • is such that a leak of refrigerant from a failed connection can not enter the occupied space
  • is such that a leak of refrigerant from a failed connection will enter the occupied space
  • 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

14: Joints in refrigeration piping must be _____ before being covered?

  • Pressurized
  • Leak tested
  • Insulated
  • Inspected

15: What is the leaving chilled water set point for water chiller systems?

  • 38F
  • 55F
  • 45F
  • 66F

16: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)

  • 77F
  • 32F
  • 58F
  • 70F

17: R-410A can segregate in the system or chemically change its composition due to a leak.

  • True
  • False

18: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.

  • Machinery rooms need not be vented
  • the mechanical room housing the refrigeration system
  • the return air ducted system
  • the outdoors

19: What is the voltage of each leg of a 480 Volt three-phase motor?

  • 277v
  • 208v
  • 120v
  • 240v

20: The freezing point of water at sea level is?

  • 32C
  • 32F
  • 0F
  • -10C

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

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

22: Where is the high-side float located on a chiller system?

  • flash line
  • inside the chiller barrel
  • discharge line
  • liquid line

23: Low temperature systems should have what?

  • High pour point
  • Low pour point
  • High viscosity
  • None of the above

24: What is an egress?

  • A code violation
  • A valve put on the low side of the system to prevent frosting
  • An entrance or exit
  • An escape route

25: Class A refrigerants are considered

  • toxic
  • flammable
  • non-flammable
  • non-toxic