Topics: ASHRAE/CMR
1: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 5
- 3
- 1
- 2
2: Pipe identification labels are required when the system contains more than
- 65 lbs
- 110 lbs
- 55 lbs
- 120 lbs
3: B3 refrigerants are considered
- non-toxic but non-flammable
- toxic but non-flammable
- toxic and highly flammable
- non-toxic but flammable
4: What is not a requirement of a class T machine room?
- automatic ventilation
- tight fitting doors
- fire hose connection to the building fire protection system
- self-closing doors
5: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 550
- 100
- 350
- 50
6: What does safe access mean?
- A clear unobstructed path to the equipment and controls
- Locked doors
- Well-lit exit signs
- OSHA approved
7: What happens after your initial inspection of a pressure vessel?
- There is a temporary shut-down until a final inspection can be performed.
- 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
8: 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'
9: What must be done to refrigerant pipes before being buried?
- Coated
- Encased
- Leaked checked
- Certified
10: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by
- District Engineering Inspectors
- Commissioned Inspectors
- Master licensed Technician
- both a or b
11: R-123 belongs to Group
- B-1
- B-3
- A-3
- B-2
12: What is R-22?
- CCFCM
- HFC
- Chlorofluoromethane
- Chlorodifluoromethane
13: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
- 110
- 100
- 90
- 80
14: High pressure controls should be set no higher than
- 10% of set point
- 80% of set point
- 90% of set point
- 25% of set point
15: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
16: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 1000F
- 700F
- 800F
- 600F
17: NH3 is
- ammonia
- lithium bromide
- R-508A
- R-718
18: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
19: Pressure vessels having an inside diameter of 6” or less shall be protected by
- a fusible plug
- a pressure relief device
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- either a fusible plug or a pressure relief device
20: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- low side of the system
- the vapor side of the system
- the liquid side of the system
- high side of the system
21: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-22
- R-12
- R-113
- R-11
22: Can ammonia be used on domestic system?
- yes
- no
- yes, for systems under 10 tons
- no, unless there is proper ventilation system installed
23: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When there are sprinklers above
- When there is a space 6' or more above it
- When its white
- When it's used as part of a supply or return air system
24: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- low pressure
- design pressure
- high pressure
- critical pressure
25: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- lower
- higher
- the same
- there is no Group B1 refrigerants