Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Start to Run windings will have what resistance?

  • Somewhere between the actual start winding and run winding resistance value
  • All will be at equal values
  • The least resistance value
  • The most resistance value

2: Which of the following types of oils are hygroscopic?

  • polyolester (POE)
  • polyalkylene glycol (PAG)
  • naphthene mineral
  • both a and b

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

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

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

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

5: A EPR valve is installed on what type of evaporators?

  • shell and tube evaporators
  • low-temperature evaporators
  • plate evaporators
  • high-temperature evaporators

6: Who approves containers for refrigerants?

  • E.P.A
  • D.O.D
  • D.O.E
  • D.O.T

7: Can you use Ammonia in industrial applications?

  • Yes, Under certain condidtions
  • No, never
  • When mixed with R-718
  • Yes, always

8: A solder joint melts at temperatures of

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

9: How would you know if there was a loss of crankcase pressure?

  • oil will thicken
  • oil will thin out
  • oil level will rise
  • oil will foam

10: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 66
  • 22
  • 25
  • 50

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

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

12: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is

  • 29F
  • 11F
  • 9F
  • 21F

13: How much clearance do you need around the perimeter of electrical panels?

  • 12"
  • 18"
  • 36"
  • 24"

14: The actual expansion curve of compression follows most nearly which one of the following curves?

  • Volume Temperature
  • Isothermal
  • Adiabatic
  • Pressure Temperature

15: If a halide torch is used for leak detection, what color is the flame if it detects a leak?

  • green
  • red
  • blue
  • orange

16: Which of the following most closely represents the concentration of Li-Br in a absorption system?

  • 40% Li-Br, 60% distilled water
  • 40% Li-Br, 60% tap water
  • 50% Li-Br, 50% tap water
  • 60% Li-Br, 40% distilled water

17: What must be done to all doors and access points in duct work going through a mechanical room?

  • Must be hindged
  • Must be screwed shut
  • Must be sealed and gasketed
  • All of the above

18: The discharge relief valve is located (9.4.6)

  • on top of the condensor
  • between the compressor and the stop valve
  • between the compressor and reciever
  • between the compressor and oil separator

19: 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

20: A movie theater would be considered a

  • institutional occupancy
  • commercial occupancy
  • public assembly occupancy
  • mixed occupancy

21: An oil pressure safety switch should be set at

  • 5 to 10 psi below low side pressure
  • 5 to 10 psi above low side pressure
  • 10 to 15 psi below low side pressure
  • 10-15 psi above low side pressure

22: A motor starter contains a thermal overload and a

  • contactor
  • solenoid
  • transformer
  • 3-way relay

23: The evaporator is a device to

  • store liquid refrigerant
  • absorb heat into the refrigeration system
  • Keep the compressor busy
  • remove heat from the refrigeration system

24: Give an example of a secondary coolant?

  • R-410A
  • R-12
  • R-717
  • R-718

25: 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