Topics: ASHRAE/CMR
1: A positive displacement compressor is
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
- is a reciprocating type compressor with 2 or more pistons
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
2: B3 refrigerants are considered
- non-toxic but non-flammable
- non-toxic but flammable
- toxic and highly flammable
- toxic but non-flammable
3: When can recovered refrigerants be reused?
- They can't
- Only when used in original owner's equipment
- Only if used in 30 days of recovery
- None of the above
4: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above
5: What is R-22?
- CCFCM
- Chlorofluoromethane
- HFC
- Chlorodifluoromethane
6: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
7: What happens after your initial inspection of a pressure vessel?
- Notify the AHJ to let them know that the system been inspected
- 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
8: No open flames are allowed in the machinery room unless?
- Approved by the authorized person
- Only when combustion air is provided from outside of the machinery room
- Approved by the installing contractor
- Never can be allowed
9: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When its white
- When there are sprinklers above
- When it's used as part of a supply or return air system
- When there is a space 6' or more above it
10: Can ammonia be used on domestic system?
- no, unless there is proper ventilation system installed
- yes
- no
- yes, for systems under 10 tons
11: What type of relief valve is used on a CO2 system?
- fusible plug
- gate valve
- glove disc
- rupture disc
12: The gauge thickness required on a CO2 tank construction is
- 5/16"
- 3/32"
- 1/16"
- 1/8"
13: What is an example of institutional occupancy?
- Dorms
- Shopping mall
- Hospital
- Football stadium
14: Refrigerants shall be classified by
- color codes
- requirements for commercial, industrial, and residential occupancies
- maximum permissible quantities of each group
- toxicity and flammability
15: When an inspection is needed, how often must it be done?
- annually
- every 24 months
- every 36 months
- every 18 months
16: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- relief plug
- rupture plug
- fusion plug
- fusible plug
17: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- the same
- lower
- higher
- there is no Group B1 refrigerants
18: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
19: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- gas masks must be worn
- explosion precautions must be taken
- no flames shall be permitted
- the owner shall be informed
20: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
- the low-pressure side of the system
- the high side of the system
- the liquid receiver
- both a and c are correct
21: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
22: High pressure controls should be set no higher than
- 10% of set point
- 90% of set point
- 25% of set point
- 80% of set point
23: How many different groups of refrigerants are there?
- 3
- 11
- 15
- 7
24: A relief valve shall be located at least ___ above grade.
- 15'
- 10'
- 25'
- 36'
25: R-22 falls under which safety classification?
- B-2
- B-1
- A-2
- A-1