Topics: All categories in the pool
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.