Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: When a refrigeration or air conditioning system is installed

  • a field inspection shall be made before it is put into service
  • the form of certificate shall be authorized by the Department of Pubic safety
  • it shall be approved by the owner for proper operation.
  • it shall not be operated below prescribed pressures

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

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

3: The generator shell contains the

  • condenser and the generator
  • condenser and the absorber
  • condenser, the evaporator, and the generator
  • evaporator and the absorber

4: A single pole-double throw switch uses how many wires?(excluding the ground)

  • 3
  • 4
  • 5
  • 2

5: How far from the window does a relief valve need to be according to ASHRAE-15?

  • At least 40'
  • At least 20'
  • At least 30'
  • There is no minimum for relief valve and windows.

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

  • 10
  • 50
  • 100
  • 1

7: Doors communicating with outside from a mechanical room must be?

  • Steel, approved, weather-stripped
  • Self-closing, approved, fire door
  • Self-closing, wooden, fire door
  • Self-closing, aligned, fire door

8: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?

  • Rotating vanes
  • Suction and discharge valves
  • Nesting scrolls
  • Fan-like action

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

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

10: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?

  • When it's used as part of a supply or return air system
  • When its white
  • When there are sprinklers above
  • When there is a space 6' or more above it

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

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

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

  • concentrated solution
  • absorbed solution
  • strong solution
  • weak solution

13: Ohm's Law indicates Amps X Resistance = ___________.

  • Current
  • Impedance
  • Ohms
  • Volts

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

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

15: 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

16: When a refrigerating machinery room is used, the emergency procedures shall be posted

  • outside the room, immediately adjacent to each door
  • on a conspicuous card located near the evaporator
  • on a conspicuous card located near the compressor
  • inside the room, immediately adjacent to each door

17: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?

  • Oil
  • Electricity
  • Heat
  • Air

18: A chiller entering and leaving temperature difference is?

  • 5 degrees F
  • 10 degrees F
  • 20 degrees F
  • 50 degrees F

19: A normal operating evaporator temperature of R-22 for air conditioning is typically

  • 55F
  • 32F
  • 58F
  • 45F

20: What is not a requirement of a class T machine room?

  • tight fitting doors
  • automatic ventilation
  • fire hose connection to the building fire protection system
  • self-closing doors

21: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?

  • Flush with ammonia
  • Flush with R-718
  • Flush with RX-11
  • Flush with R-11

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

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

23: What is the purpose of suction/discharge traps?

  • to ensure proper oil return to the compressor
  • to keep oil inside the evaporator for proper oil return to the compressor
  • to keep oil inside of the accumulator for proper return to the compressor
  • all of the above

24: Foaming of oil in a compressor is most likely to occur

  • when there is insufficient air across the condenser(i.e., dirty coil)
  • when the evaporator temperatures are below 32F
  • at start-up
  • when ambient temperature are low

25: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.

  • 80%
  • 99%
  • 75%
  • 90%