Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

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

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

3: What is R-22?

  • Chlorofluoromethane
  • HFC
  • Chlorodifluoromethane
  • CCFCM

4: All machine rooms must be outfitted with a detector that _______?

  • activates an audible alarm
  • activates a visual alarm
  • starts the ventilation system
  • All of the above

5: "I" represents ____ in the Ohm's law formula.

  • voltage.
  • resistance
  • amperage
  • capacitance

6: What will occur if the strong solution in an absorption chiller becomes too strong?

  • The machine will cool excessively as the solution crystallizes.
  • The machine will cool excessively as the solution evaporates
  • The machine will stop cooling and solution will crystallize
  • The machine will stop cooling and the solution will evaporate.

7: An example of direct system is

  • rooftop unit
  • chiller
  • absorber
  • none of the above

8: Low pressure systems have what kind of compressor?

  • Rotary
  • Centrifugal
  • Scroll
  • Reciprocating

9: A 3-cubic foot receiver must have what type of relief valve?

  • fusible plug
  • relief valve
  • rupture device
  • none of the above

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

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

11: How many CFMs are required per square foot of commercial office occupied space

  • .5 CFM
  • 15 CFM
  • 20 CFM
  • 5 CFM

12: Megaohm meters can detect a ground in the

  • up to 10,000 ohms
  • 10,000,000 ohms or higher
  • up to 1,000,000 ohms
  • up to 1,000 ohms

13: Mercury was used in thermometers primarily because it

  • expands uniformly
  • vaporizes at very high temperatures
  • was inexpensive
  • never freezes

14: What type refrigerant is NOT ozone depleting?

  • HCFC
  • HFC
  • Halon
  • CFC

15: The outer portion of shell of the compressor used on low-pressure chillers is called the

  • volute
  • baffle
  • suction
  • nozzle

16: What type of relief valve is used on low pressure centrifugal compressor systems?

  • Spring-loaded relief valve
  • Rupture disc
  • Purge relief
  • None of the above

17: Where would the EPR valve be located on a multiple evaporator system?

  • outlet of the liquid line
  • inlet of the low temperature evaporator.
  • outlet of high temperature evaporator
  • outlet of low temperature evaporator

18: If the power element on an expansion valve should lose its charge, the valve would

  • Over feed
  • Stay open
  • Close
  • Under feed

19: A movie theater would be considered a

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

20: When must refrigeration system covered by the code be inspected?

  • Not required
  • Annually
  • Annually and when installed
  • Upon installation

21: Name an HCFC refrigerant(s):

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

22: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against

  • 116
  • 38
  • 108
  • 88

23: If the spring is adjusted to increase the superheat, this new setting will

  • allow more liquid into the evaporator
  • have no effect on the frost line
  • lengthen the frost line
  • shorten the frost line

24: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?

  • Because it's a non-flammable refrigerant
  • R-718 is not rated unlimited because it's a dangerous refrigerant
  • Because it's cheap
  • Because it's water

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

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