Topics: ASHRAE/CMR
1: 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
2: Class T machine room
- shall include closets used for setting equipment
- shall have remote controls to stop the action of the refrigerant compressor
- has no flame producing apparatus permanently installed
- shall have refrigerant leak detecting systems installed inside and outside the room
3: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 9.00'
- 7.25'
- 8'4"
- 7.00'
4: Most CFC's are
- inert but toxic
- flammable
- toxic
- inert
5: Name three things that must be done when changing refrigeration lubricant?
- Nothing must be done
- Place sign, check for leaks, insulate
- You can't change lubricants.
- Make sure it's compatible, notify owner, notify AHJ
6: 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 cheap
- Because it's a non-flammable refrigerant
7: The Board of Boilers adopts by reference
- the MACS Pressure Vessel Code of Massachusetts
- the 1997 ANSI/ASHRAE Safety Code
- Montreal Protocol Safety Code
- MSCA Code
8: When should a relief valve start to function?
- Before the purge station discharges
- Two times it's working pressure
- At it's set pressure
- 10 psi before it's set pressure
9: 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
10: What type of pressure relief device is used on a CO2 system?
- Fusible plug
- Glove valve
- Rupture disk
- Gate valve
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: A class A3 refrigerant is considered
- toxic and somewhat flammable
- non-toxic and non-flammable
- toxic and non-flammable
- non-toxic but highly flammable
13: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 5.5
- 2.0
- 2.5
- 3.0
14: What would be the classification for Stop & Shop grocery store?
- Instituional
- Large mercantile
- Place of assembly
- Industrial
15: How many groups of refrigerants are there?
- 7
- 3
- 1
- 5
16: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class A machinery room
- Class B machinery room
- Class M machinery room
- Class T machinery room
17: A restaurant is classified as a
- large mercantile occupancy
- mixed occupancy
- public assembly occupancy
- commercial occupancy
18: What type of relief valve is used on a CO2 system?
- glove disc
- fusible plug
- rupture disc
- gate valve
19: 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
20: What is R-22?
- HFC
- Chlorodifluoromethane
- Chlorofluoromethane
- CCFCM
21: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
22: Dual-pressure relief devices should be installed on
- vessels of 10 cubic feet or less
- vessels of 10 cubic feet or more
- vessels of 3 cubic feet or more
- vessels of 3 cubic feet or less
23: 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
24: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 660 lbs
- 330 lbs.
- 55 lbs
- 550 lbs
25: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above