Topics: ASHRAE/CMR
1: What refrigerant is an inorganic compound?
- R-410A
- R-132A
- R-22
- Ammonia
2: 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.
3: Each machinery room shall contain
- smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
- high and low pressure controls
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
4: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- critical pressure
- design pressure
- high pressure
- low pressure
5: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Nothing must be done
- Make sure its compatible, notify owner, and notify AHJ.
- Place sign, check for leaks, and insulate suction line
- you can never change refrigerants
6: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 80%
- 99%
- 75%
- 90%
7: When a refrigerating machinery room is used, the emergency procedures shall be posted
- inside the room, immediately adjacent to each door
- outside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
- on a conspicuous card located near the evaporator
8: High pressure controls should be set no higher than
- 90% of set point
- 25% of set point
- 10% of set point
- 80% of set point
9: Dual-pressure relief devices should be installed on
- vessels of 10 cubic feet or more
- vessels of 10 cubic feet or less
- vessels of 3 cubic feet or less
- vessels of 3 cubic feet or more
10: What type of relief valve is used on a CO2 system?
- gate valve
- rupture disc
- fusible plug
- glove disc
11: What is an example of institutional occupancy?
- Shopping mall
- Dorms
- Football stadium
- Hospital
12: What is the refrigerant chlorodifluoromethane?
- R-12
- R-22
- R-134a
- R-123
13: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- fusion plug
- rupture plug
- relief plug
- fusible plug
14: 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
15: Direct systems using Group II refrigerants
- shall be allowed to be used for human comfort.
- shall be installed in Class T machinery rooms
- shall not be used for air condition for human comfort
- shall be installed per instruction of the AHJ
16: Joints in refrigeration piping must be _____ before being covered?
- Inspected
- Pressurized
- Insulated
- Leak tested
17: 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
18: What kind of material can't be used on the outlet of a relief valve?
- Stainless Steel
- Aluminum
- PVC
- Copper
19: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
20: R-410A is classified as a ____ refrigerant on the safety matrix.
- B-1
- B-2
- A-2
- A-1
21: What is not a requirement of a Class T machine room?
- Tight fitting doors
- Automatic ventilation
- Self-closing doors
- Fire hose connected to the building fire protection system.
22: What section of ASHRAE-15 governs pressure vessels?
- Section 6 ASHRAE-34 ASME VIII unfired
- OSHA
- Section 7 ASHRAE-15 ASME VIII fired
- Section 9 ASHRAE-15 ASME VIII unfired
23: Ammonia belongs to Group
- B-1
- A-2
- B-2
- A-1
24: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 1,000
- 110
- 330
- 6.6
25: R-123 belongs to Group
- B-2
- B-1
- A-3
- B-3