Topics: ASHRAE/CMR
1: 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
2: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 36
- 18
- 48
- 24
3: 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
4: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- Machinery rooms need not be vented
- the return air ducted system
- the outdoors
- the mechanical room housing the refrigeration system
5: Direct systems using Group II refrigerants
- shall be installed in Class T machinery rooms
- shall be installed per instruction of the AHJ
- shall be allowed to be used for human comfort.
- shall not be used for air condition for human comfort
6: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above
7: What type of relief valve is used on low pressure centrifugal compressor systems?
- Spring-loaded relief valve
- Rupture disc
- Purge relief
- None of the above
8: Halo-carbon refrigerants cannot be used with what material?
- Stainless Steel
- Aluminum
- Copper
- Magnesium alloy
9: Halogen refrigerants are corrosive to which type of metal?
- stainless steel
- black iron
- magnesium
- copper
10: 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
11: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
12: Machinery rooms must be vented to ______?
- basement
- unoccupied spaces
- neutralizing tank
- outdoors
13: What is R-22?
- Chlorofluoromethane
- HFC
- Chlorodifluoromethane
- CCFCM
14: A relief valve shall be located at least ___ above grade.
- 10'
- 15'
- 36'
- 25'
15: A class B2 refrigerant is considered
- toxic and somewhat flammable
- non-toxic and highly flammable
- non-toxic and non-flammable
- toxic and non-flammable
16: How are refrigerant blends classified?
- Based on worst case fractionation
- Blends don't have to be classified
- Based on best case Fractionation
- Based on the oil used
17: How far from the ground does a relief valve need to be?
- At least 15' above grade
- Not more than 3' above grade
- At least 20' above grade
- At least 25' above grade
18: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
19: What would be the classification for Stop & Shop grocery store?
- Industrial
- Place of assembly
- Instituional
- Large mercantile
20: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)
- Pressure gauge
- Temperature gauge
- Sight glass gauge
- All of the above
21: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
22: What would be the classification of a church?
- Industrial
- Place of assembly
- Large mercantile
- Institutional
23: Halogenated refrigerants cannot be used with what material?
- Copper
- Aluminum
- Stainless steel
- Magnesium alloy
24: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above
25: How many different groups of refrigerants are there?
- 7
- 3
- 15
- 11