Topics: ASHRAE/CMR
1: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
2: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
3: What would be the classification of a church?
- Large mercantile
- Place of assembly
- Institutional
- Industrial
4: R-22 is classified as a ____ refrigerant on the safety matrix.
- A-2
- A-1
- B-2
- B-1
5: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the return air ducted system
- the outdoors
- the mechanical room housing the refrigeration system
- Machinery rooms need not be vented
6: Indirect systems using Group II refrigerants
- shall be used in refrigeration system less than 1,000 lbs
- shall be used for mechanical equipment only
- shall be used in refrigeration system in excess of 1,000 lbs
- shall have all refrigerant containing parts except piping, installed in a Class T machine room
7: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 2.0
- 3.0
- 2.5
- 5.5
8: Single compound Refrigerants are classified by what two criteria?
- Weight and color
- Temperature range and hazardousness
- Flammability and temperature range
- Flammability and toxicity
9: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 44 lbs
- 6.6 lbs
- 22 lbs
- 13.9 lbs
10: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 55 lbs
- 550 lbs
- 330 lbs.
- 660 lbs
11: Stop valves shall not be permitted between the system and the
- condenser
- relief valve
- bleed valve
- service valve
12: Machinery rooms must be vented to ______?
- basement
- neutralizing tank
- unoccupied spaces
- outdoors
13: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- commercial occupancy
- institutional occupancy
- public assembly occupancy
- mixed occupancy
14: When air is ducted through a machine room that services occupied space, What must be done?
- Insulated and cross broke
- Flanged and gasketed
- Welded and seamed.
- Ducted and sealed
15: How many groups of refrigerants are there?
- 3
- 1
- 5
- 7
16: Whoever owns/uses a refrigeration or air conditioning system covered by this code
- must notify the Department of Public Safety prior to starting the system
- shall be licensed by the Commonwealth of Massachusetts according to CMR 522
- shall make application for inspections to the Chief of Inspectors
- None of the above
17: What is the refrigerant dichlorodifluoromethane?
- R-123
- R-22
- R-134A
- R-12
18: R-123 belongs to Group
- B-1
- B-3
- B-2
- A-3
19: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
20: A positive displacement compressor is
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- is a reciprocating type compressor with 2 or more pistons
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
21: Trichlorofluoromethane is the name of what refrigerant?
- R-502
- R-12
- R-113
- R-11
22: What happens after your initial inspection of a pressure vessel?
- Inspector leaves a metal tag with a certification listed on it
- Notify the Fire Marshal that the system has been inspected and approved
- 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.
23: High pressure controls should be set no higher than
- 80% of set point
- 25% of set point
- 90% of set point
- 10% of set point
24: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
25: 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