Topics: ASHRAE/CMR
1: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
2: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
3: Refrigerant restricted in 2004 but used for transition for decades:
- R-134A
- R-123
- R-22
- R-11
4: Where must a refrigeration contractor's license number be displayed?
- Trucks, license plates, and uniforms
- Trucks, invoices, and advertising
- Truck, office, every job, and on all equipment
- Uniforms, checks, and invoices.
5: What type of relief valve is used on a CO2 system?
- gate valve
- glove disc
- fusible plug
- rupture disc
6: How many CFMs are required per square foot of commercial office occupied space
- 15 CFM
- .5 CFM
- 20 CFM
- 5 CFM
7: Refrigerants shall be classified by
- color codes
- requirements for commercial, industrial, and residential occupancies
- maximum permissible quantities of each group
- toxicity and flammability
8: Which refrigerant class listed below is the most flammable?
- A-3
- B-2
- A-1
- C-3
9: What is the minimum size of the discharge pipe?
- Same size as the outlet of the relief valve
- One pipe size larger that the inlet of the relief valve
- Depends on size of manifold
- All of the above
10: Ammonia is under what safety classification?
- B2
- A3
- B3
- B1
11: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- annually
- quarterly
- bi-annually
- regularly
12: A machine room with a refrigerant system using ammonia shall
- be provided with a continuously operated ventilation system
- be considered a non-hazardous location in accordance with National Electrical code
- have no flame producing apparatus permanently installed and operated
- All of the above
13: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- relief plug
- fusion plug
- rupture plug
- fusible plug
14: Pressure vessels nameplate markings must be compliant with the
- ASHRAE 34 Standards
- CMR-588 & CMR-528
- ASME Boiler and Pressure Vessel Code
- All of the Above
15: 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
- outside the room, immediately adjacent to each door
- inside the room, immediately adjacent to each door
16: All electrical work done on refrigeration systems must comply with
- NEC and Massachusetts Modifications
- ASHREA-15 Section 9.2.1
- Department of Energy
- OSHA
17: What is the minimum height refrigeration piping should be placed against walls?
- 6'
- 72"
- 7.25'
- Ceiling height
18: The color code of a tank of ammonia is
- white
- light green
- silver
- lavender
19: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 5
- 2
- 3
- 1
20: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
- 75
- 50
- 55
- 15
21: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- Temperature limiter device
- Circuit Breaker
- T&P device
- Relief valve
22: Stop valves shall not be permitted between the system and the
- relief valve
- bleed valve
- service valve
- condenser
23: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 800F
- 600F
- 700F
- 1000F
24: Class 3 refrigerants are
- highly flammable
- non-toxic
- non-flammable
- toxic
25: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above