Topics: ASHRAE/CMR
1: Dual-pressure relief devices should be installed on
- vessels of 3 cubic feet or more
- vessels of 10 cubic feet or less
- vessels of 10 cubic feet or more
- vessels of 3 cubic feet or less
2: Systems containing more than 110 pounds must have stop valves located at the
- compressor suction inlet
- compressor discharge outlet
- receiver inlet and outlet
- All of the above
3: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 1.2
- 2.2
- 1.5
- 1
4: R-22 is classified as a ____ refrigerant on the safety matrix.
- A-2
- B-1
- B-2
- A-1
5: No open flames are allowed in the machinery room unless?
- Approved by the authorized person
- Never can be allowed
- Only when combustion air is provided from outside of the machinery room
- Approved by the installing contractor
6: Which occupancy can ammonia be used in?
- industrial
- commercial
- depends on the quantity of freon
- redifential
7: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 30 days
- 1 week
- 14 days
- 2 months
8: What refrigerant doesn't have to be classifted?
- R-711
- R-718
- R-134a
- R-717
9: A relief valve shall be located at least ___ above grade.
- 10'
- 36'
- 25'
- 15'
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: R-11 belongs to Group
- A-1
- B-1
- B-3
- A-2
12: When a refrigeration or air conditioning system is installed
- the form of certificate shall be authorized by the Department of Pubic safety
- a field inspection shall be made before it is put into service
- it shall be approved by the owner for proper operation.
- it shall not be operated below prescribed pressures
13: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 66
- 22
- 25
- 50
14: What pipe can not be used for refrigeration?
- K
- N
- L
- M
15: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-12
- R-11
- R-22
- R-113
16: 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
- 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
17: NH3 is
- R-508A
- ammonia
- lithium bromide
- R-718
18: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 20
- 75
- 50
- 15
19: What is the refrigerant chlorodifluoromethane?
- R-12
- R-134a
- R-22
- R-123
20: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's water
- Because it's a non-flammable refrigerant
- Because it's cheap
21: A class B2 refrigerant is considered
- toxic and non-flammable
- non-toxic and non-flammable
- non-toxic and highly flammable
- toxic and somewhat flammable
22: When an inspection is needed, how often must it be done?
- annually
- every 18 months
- every 24 months
- every 36 months
23: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.
24: Can ammonia be used on domestic system?
- no, unless there is proper ventilation system installed
- no
- yes, for systems under 10 tons
- yes
25: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
- 100
- 250
- 400
- 350