Topics: ASHRAE/CMR
1: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 99%
- 80%
- 75%
- 90%
2: What must be done to refrigerant pipes before being buried?
- Coated
- Leaked checked
- Certified
- Encased
3: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
- fusible plug
- relief valve
- rupture disc
- all of the above
4: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
5: What is the refrigerant dichlorodifluoromethane?
- R-123
- R-134A
- R-22
- R-12
6: 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
7: The color code of a tank of ammonia is
- white
- lavender
- silver
- light green
8: Class 3 refrigerants are
- highly flammable
- non-toxic
- non-flammable
- toxic
9: The Department that certifies the transportation of refrigerant is the
- RSES
- EPO
- DOT
- EPA
10: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 75
- 50
- 15
- 20
11: Who approves containers for refrigerants?
- D.O.T
- E.P.A
- D.O.D
- D.O.E
12: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 500 lbs
- 330 lbs
- 660 lbs
- 55 lbs
13: How many different groups of refrigerants are there?
- 7
- 15
- 3
- 11
14: What would be the classification for Stop & Shop grocery store?
- Instituional
- Place of assembly
- Large mercantile
- Industrial
15: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
16: Who is permitted to access a refrigeration machine room?
- Contractors only
- Any employee
- Authorized persons only
- Anyone, it's a completely safe area
17: High pressure controls should be set no higher than
- 80% of set point
- 10% of set point
- 25% of set point
- 90% of set point
18: When a refrigeration or air conditioning system is installed
- the form of certificate shall be authorized by the Department of Pubic safety
- a field inspection shall be made before it is put into service
- it shall not be operated below prescribed pressures
- it shall be approved by the owner for proper operation.
19: The certificate of inspection
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be authorized by a notarized insurance company
- shall be posted on the compressor shell or electrical panel at the unit
- shall be posted and protected from dirt, water, and other elements
20: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 5
- 1
- 3
- 2
21: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
22: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- fusion plug
- relief plug
- rupture plug
- fusible plug
23: Pressure vessels having an inside diameter of 6” or less shall be protected by
- a fusible plug
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- either a fusible plug or a pressure relief device
- a pressure relief device
24: When an inspection is needed, how often must it be done?
- every 18 months
- annually
- every 24 months
- every 36 months
25: 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