Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.

  • True
  • False

2: What happens after your initial inspection of a pressure vessel?

  • There is a temporary shut-down until a final inspection can be performed.
  • Inspector leaves a metal tag with a certification listed on it
  • Notify the Fire Marshal that the system has been inspected and approved
  • Notify the AHJ to let them know that the system been inspected

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

  • Centrifugal
  • Reciprocating
  • Scroll
  • Screw

4: An electronic bridge circuit is basically a

  • high voltage circuit
  • suspension
  • 24 volt control circuit
  • Wheatstone

5: What chemical in the refrigerant set off the leak detection alarm?

  • Fluorine
  • Chlorine
  • Both A and B
  • none of the above

6: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with

  • ammonia
  • trichlorotrifluoromethane
  • R-718
  • methyl chloride

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

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

8: Thermodynamics is the branch of science that deals with

  • heat energy
  • molecular therory
  • state of energy
  • energy due to motion

9: Large mercantile occupancy is

  • a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
  • a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
  • a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
  • a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise

10: What is Trichlorotrifluoromethane?

  • R-13
  • R-113
  • R-11
  • R-12

11: To determine the pump size needed for an open cooling tower system, the following must be known,

  • GPM and balanced head and friction head
  • GPM and unbalanced head and friction head
  • GPM and friction head
  • GPM, pipe size, and equivalent head.

12: What type of voltage causes the winding in a potential relay to open?

  • BEMF (Back Electro-Motive Force)
  • 24V control voltage from the thermostat
  • 120V line voltage
  • None of the above

13: The low pressure oil safety switch

  • never trips
  • resets itself after the time delay has terminated
  • resets itself automatically
  • must be reset manually

14: Name an HCFC refrigerant(s):

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

15: Capacity control on a centrifugal compressor is accomplished by the

  • slide vanes
  • pre-rotational guide vanes
  • check valves
  • post-rotational guide vanes

16: The main purpose of a refrigerant detector in a machinery room is to

  • inform there is a refrigerant leak int he system
  • detect toxins in the air caused by a refrigerant leak
  • to set off an alarm when there is refrigerant present inside the room
  • all of the above

17: A low oil switch is typically

  • automatic reset
  • manual reset
  • time-delay auto reset
  • non used on semi-hermetic compressors over 10 ton capacity

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

  • 277v
  • 120v
  • 208v
  • 240v

19: Which winding have the most turns?

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

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

  • 32C
  • 0F
  • 32F
  • -10C

21: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.

  • True
  • False

22: "E" references ____ in the Ohm's law formula

  • voltage
  • resistance
  • amperage
  • capacitance

23: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?

  • it would make the condenser more efficient
  • it would make the condenser less efficient
  • it would have no effect on the condenser
  • it would cause the condenser to sweat

24: NH3 is

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

25: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are

  • companion or block valves
  • ball valves
  • gate or globe valves
  • king valves