Topics: ASHRAE/CMR
1: How much refrigerant can be stored in a mechanical room outside of the system?
- 200
- 330
- 100
- 150
2: R-717 is
- ammonia
- trichloromethane
- water
- carbon dioxide
3: When an inspection is needed, how often must it be done?
- every 24 months
- every 18 months
- annually
- every 36 months
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: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- the owner shall be informed
- gas masks must be worn
- explosion precautions must be taken
- no flames shall be permitted
6: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
- shall use pressure relief devices
- shall use fusible plugs
7: Who is permitted to access a refrigeration machine room?
- Contractors only
- Anyone, it's a completely safe area
- Authorized persons only
- Any employee
8: Stop valves shall not be permitted between the system and the
- relief valve
- bleed valve
- service valve
- condenser
9: Pipe identification labels are required when the system contains more than
- 55 lbs
- 65 lbs
- 110 lbs
- 120 lbs
10: 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
11: 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
12: 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
13: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
- commercial occupancy
- institutional occupancy
- illegal occupancy
- public assembly occupancy
14: How many different groups of refrigerants are there?
- 3
- 15
- 7
- 11
15: When must refrigeration system covered by the code be inspected?
- Annually and when installed
- Not required
- Annually
- Upon installation
16: Indirect systems using Group II refrigerants
- shall be used for mechanical equipment only
- shall be used in refrigeration system less than 1,000 lbs
- shall have all refrigerant containing parts except piping, installed in a Class T machine room
- shall be used in refrigeration system in excess of 1,000 lbs
17: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
18: How are refrigerant blends classified?
- Blends don't have to be classified
- Based on best case Fractionation
- Based on the oil used
- Based on worst case fractionation
19: Which refrigerant class listed below is the most flammable?
- B2
- A3
- C3
- A2
20: 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
21: Each machinery room shall contain
- 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
- 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
22: Relief valves are rated in
- gallons of water per minute
- gallons of water per hour
- pounds of air per hour
- pounds of air per minute
23: 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
24: Halo-carbon refrigerants cannot be used with what material?
- Magnesium alloy
- Aluminum
- Copper
- Stainless Steel
25: _____ and its alloys are suitable for use with ammonia systems.
- Zinc
- Aluminum
- Copper
- Magnesium