Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What device measures the specific gravity of a substance?

  • Hydrometer
  • Manometer
  • Thermometer
  • Hygrometer

2: What must be done if refrigeration lines pass through a concrete floor?

  • insulated
  • installed through a pipe casing
  • moisture barrier
  • leak checked

3: The critical temperature of a refrigerant gas occurs when

  • the gas is no longer saturated
  • any decrease in pressure will cause condensation
  • the gas returns to a liquid
  • any increase in pressure will not liquefy the gas

4: If a purge unit fails on a low pressure chiller, what are the symptoms?

  • high head pressure
  • low suction pressure
  • low pressure chillers do not have purge units
  • increased capacity

5: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be

  • 66.1 psig
  • 70.8 psig
  • 43.3 psig
  • 50.2 psig

6: How many square inches per square foot?

  • 64
  • 144
  • 98
  • 24

7: A room having machinery but no flame producing apparatus permanently installed and operated is considered a

  • Class A machinery room
  • Class B machinery room
  • Class T machinery room
  • Class M machinery room

8: Ammonia belongs to Group

  • A-1
  • A-2
  • B-1
  • B-2

9: A hotel is considered a _______ occupancy.

  • institutional
  • residential
  • mercantile
  • commercial

10: The certificate of inspection

  • shall be authorized by a notarized insurance company
  • shall be posted and protected from dirt, water, and other elements
  • shall be $20 and an additional fee of $1 for each tone above 20 tons
  • shall be posted on the compressor shell or electrical panel at the unit

11: A thermometer inside a duct measures ____ heat.

  • sensible
  • hidden
  • specific
  • latent

12: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.

  • 10
  • 20
  • 25
  • 15

13: At higher altitudes, boiling temperatures

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

14: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is

  • reset the safety valve
  • start the fan and circulating pump
  • reset the expansion valve
  • start the comrpessor

15: Pressure is equivalent of

  • Force
  • Force / Area
  • Force X Area
  • Area X Force

16: How many groups of refrigerants are there?

  • 3
  • 1
  • 7
  • 5

17: If the power element of an expansion valve should lose its charge the valve would

  • underfeed the evaporator
  • overfeed the evaporator
  • go open
  • go closed

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

  • Scroll
  • Centrifugal
  • Reciprocating
  • Screw

19: If air is present in an absorption chilled water appliance, which of the following will most likely occur?

  • The Li-Br solution will become more concentrated
  • System operating pressure will drop
  • Rust can form
  • The Li-Br solution will become more diluted

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

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

21: Capacitors are rated in

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

22: What refrigerant doesn't have to be classified?

  • R-717
  • R-718
  • R-422A
  • R-134A

23: How many gallons of water do you need per pound of ammonia?

  • 1
  • 50
  • 10
  • 100

24: Name a CFC refrigerant(s):

  • R-11
  • R-12
  • R-123
  • both a & b

25: The critical temperature of a refrigerant gas occurs when

  • the gas is no longer saturated
  • the gas returns to a liquid
  • any increase in pressure will not liquefy the gas
  • any decrease in pressure will cause condensation