Topics: ASHRAE/CMR
1: Ammonia (NH3) is a group III refrigerant
- True
- False
2: 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
- 5.5
- 2.5
3: Refrigerant restricted in 2004 but used for transition for decades:
- R-134A
- R-22
- R-11
- R-123
4: Single compound Refrigerants are classified by what two criteria?
- Flammability and temperature range
- Weight and color
- Flammability and toxicity
- Temperature range and hazardousness
5: Defined process piping by code CMR (528)
- Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
- Any piping in an industrial space
- Any piping in an industrial or commercial space
- All of the above
6: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 15
- 25
- 10
- III
7: 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.
8: What is the minimum size of the discharge pipe?
- Same size as the outlet of the relief valve
- One pipe size larger that the inlet of the relief valve
- Depends on size of manifold
- All of the above
9: Refrigerants shall be classified by
- color codes
- toxicity and flammability
- requirements for commercial, industrial, and residential occupancies
- maximum permissible quantities of each group
10: What is a Category "D" fluid?
- A typical refrigerant used on newer air conditioning and heat pump ssytems
- Any fluid that exceeds 150 psig and has design temperature of over 366F
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
11: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 1.5
- 1
- 2.2
- 1.2
12: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-11
- R-12
- R-22
- R-113
13: What is an example of institutional occupancy?
- Hospital
- Shopping mall
- Football stadium
- Dorms
14: A class B2 refrigerant is considered
- toxic and non-flammable
- non-toxic and highly flammable
- toxic and somewhat flammable
- non-toxic and non-flammable
15: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
16: A movie theater would be considered a
- public assembly occupancy
- mixed occupancy
- commercial occupancy
- institutional occupancy
17: What is Trichlorotrifluoromethane?
- R-12
- R-113
- R-13
- R-11
18: Liquid level gauges must be provided with what?
- Automatic shut-offs
- A relief valve
- A low level mark
- A red line
19: When should a relief valve start to function?
- At it's set pressure
- 10 psi before it's set pressure
- Before the purge station discharges
- Two times it's working pressure
20: Ammonia belongs to Group
- B-1
- A-1
- B-2
- A-2
21: R-11 belongs to Group
- B-1
- B-3
- A-2
- A-1
22: What pipe can not be used for refrigeration?
- L
- M
- N
- K
23: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
24: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 330 lbs
- 660 lbs
- 500 lbs
- 55 lbs
25: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above