Topics: ASHRAE/CMR
1: What is not a requirement of a class T machine room?
- self-closing doors
- fire hose connection to the building fire protection system
- automatic ventilation
- tight fitting doors
2: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
3: Large mercantile occupancy is
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
4: Halo-carbon refrigerants cannot be used with what material?
- Aluminum
- Copper
- Stainless Steel
- Magnesium alloy
5: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
6: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Copper
- Nickel
- Zinc
- Magnesium
7: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- there is no Group B1 refrigerants
- the same
- higher
- lower
8: What type of material can't be used on the outlet of a relief valve?
- Stainless steel
- Magnesium alloy
- PVC
- Copper
9: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- Relief valve
- Temperature limiter device
- T&P device
- Circuit Breaker
10: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
- shall use fusible plugs
- shall use pressure relief devices
11: Pressure vessels with an internal volume of 3 cubic feet or more
- do not need pressure relief protection
- shall use pressure relief devices
- shall use pressure relief devices or fusible plugs
- shall use fusible plugs
12: 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
13: Ammonia (NH3) is a group III refrigerant
- True
- False
14: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
15: A movie theater would be considered a
- public assembly occupancy
- mixed occupancy
- institutional occupancy
- commercial occupancy
16: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
17: When should a relief valve start to function?
- At it's set pressure
- Two times it's working pressure
- Before the purge station discharges
- 10 psi before it's set pressure
18: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
19: Direct systems using Group II refrigerants
- shall be allowed to be used for human comfort.
- shall not be used for air condition for human comfort
- shall be installed per instruction of the AHJ
- shall be installed in Class T machinery rooms
20: 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.
21: Single compound Refrigerants are classified by what two criteria?
- Flammability and temperature range
- Weight and color
- Flammability and toxicity
- Temperature range and hazardousness
22: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use pressure relief devices or fusible plugs
- shall use fusible plugs
- shall use rupture discs or duel pressure relief valves
- shall use pressure relief devices
23: Which refrigerant replaced R-12?
- R-407A
- R-410A
- R-22
- R-134A
24: Which refrigerant class listed below is the most flammable?
- B2
- A3
- A2
- C3
25: A positive displacement compressor is
- 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
- 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