Topics: ASHRAE/CMR
1: A positive displacement compressor is
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- is a reciprocating type compressor with 2 or more pistons
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
2: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the
- boiler
- evaporator
- outside the machinery room
- compressor
3: What type refrigerant is NOT ozone depleting?
- HCFC
- HFC
- Halon
- CFC
4: What is not a requirement of a class T machine room?
- fire hose connection to the building fire protection system
- tight fitting doors
- self-closing doors
- automatic ventilation
5: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 25
- 22
- 66
6: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- bi-annually
- regularly
- annually
- quarterly
7: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UL and UR
- UL and UM
- UV or UR
- UM or UL
8: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 2.2
- 1
- 1.5
- 1.2
9: Dual-pressure relief devices should be installed on
- vessels of 10 cubic feet or more
- vessels of 3 cubic feet or more
- vessels of 3 cubic feet or less
- vessels of 10 cubic feet or less
10: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- there is no Group B1 refrigerants
- the same
- higher
- lower
11: How much clearance do you need around the perimeter of electrical panels?
- 24"
- 18"
- 12"
- 36"
12: When a refrigerating machinery room is used, the emergency procedures shall be posted
- on a conspicuous card located near the compressor
- on a conspicuous card located near the evaporator
- inside the room, immediately adjacent to each door
- outside the room, immediately adjacent to each door
13: What would be the classification of a church?
- Place of assembly
- Large mercantile
- Institutional
- Industrial
14: What would be the classification for Stop & Shop grocery store?
- Large mercantile
- Place of assembly
- Industrial
- Instituional
15: What kind of material can't be used on the outlet of a relief valve?
- Copper
- Stainless Steel
- Aluminum
- PVC
16: Ammonia (NH3) is a group III refrigerant
- True
- False
17: What type of pressure relief device is used on a CO2 system?
- Gate valve
- Rupture disk
- Glove valve
- Fusible plug
18: What does safe access mean?
- Locked doors
- OSHA approved
- A clear unobstructed path to the equipment and controls
- Well-lit exit signs
19: Which refrigerant replaced R-12?
- R-407A
- R-22
- R-410A
- R-134A
20: 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
21: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 660 lbs
- 500 lbs
- 55 lbs
- 330 lbs
22: What is not a requirement of a Class T machine room?
- Fire hose connected to the building fire protection system.
- Self-closing doors
- Tight fitting doors
- Automatic ventilation
23: What is an example of institutional occupancy?
- Football stadium
- Hospital
- Shopping mall
- Dorms
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: Halo-carbon refrigerants cannot be used with what material?
- Aluminum
- Magnesium alloy
- Stainless Steel
- Copper