Topics: ASHRAE/CMR
1: All machine rooms must be outfitted with a detector that _______?
- activates an audible alarm
- activates a visual alarm
- starts the ventilation system
- All of the above
2: Which refrigerant replaced R-12?
- R-410A
- R-407A
- R-22
- R-134A
3: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- low pressure
- design pressure
- critical pressure
- high pressure
4: What is a Category "D" fluid?
- A typical refrigerant used on newer air conditioning and heat pump ssytems
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
- Any fluid that exceeds 150 psig and has design temperature of over 366F
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
5: The gauge thickness required on a CO2 tank construction is
- 3/32"
- 1/16"
- 5/16"
- 1/8"
6: What refrigerant were phased out in 2004?
- R-11
- R-22
- R-134a
- R-12
7: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 1
- 2
- 3
- 5
8: Dual-pressure relief devices should be installed on
- vessels of 3 cubic feet or less
- vessels of 3 cubic feet or more
- vessels of 10 cubic feet or more
- vessels of 10 cubic feet or less
9: When an inspection is needed, how often must it be done?
- every 36 months
- every 24 months
- every 18 months
- annually
10: Pipe identification labels are required when the system contains more than
- 55 lbs
- 120 lbs
- 110 lbs
- 65 lbs
11: Which refrigerant class listed below is the most flammable?
- C3
- A3
- B2
- A2
12: Pressure vessels having an inside diameter of 6” or less shall be protected by
- either a fusible plug or a pressure relief device
- a pressure relief device
- a fusible plug
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
13: How many different groups of refrigerants are there?
- 7
- 3
- 11
- 15
14: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
15: A hotel is considered a _______ occupancy.
- commercial
- mercantile
- institutional
- residential
16: What is not a requirement of a class T machine room?
- fire hose connection to the building fire protection system
- tight fitting doors
- automatic ventilation
- self-closing doors
17: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
18: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 18
- 22
- 50
- 33
19: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 24
- 36
- 48
- 18
20: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
- CFC-11
- Lithium bromide
- ammonia
- HCFC-123
21: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Make sure its compatible, notify owner, and notify AHJ.
- Place sign, check for leaks, and insulate suction line
- Nothing must be done
- you can never change refrigerants
22: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-2
- B-2
- A-1
- B-1
23: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
24: What pipe can not be used for refrigeration?
- N
- L
- K
- M
25: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False