Topics: ASHRAE/CMR
1: 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
2: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
3: What kind of material can't be used on the outlet of a relief valve?
- Copper
- PVC
- Aluminum
- Stainless Steel
4: Class T machine room
- shall have refrigerant leak detecting systems installed inside and outside the room
- has no flame producing apparatus permanently installed
- shall have remote controls to stop the action of the refrigerant compressor
- shall include closets used for setting equipment
5: What section of ASHRAE-15 governs pressure vessels?
- Section 7 ASHRAE-15 ASME VIII fired
- Section 6 ASHRAE-34 ASME VIII unfired
- OSHA
- Section 9 ASHRAE-15 ASME VIII unfired
6: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
7: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
8: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- “UL”
- “UV”
- “UM” and “UV”
- “U” or “UM”
9: 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
10: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
11: 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
12: Halogen refrigerants are corrosive to which type of metal?
- copper
- black iron
- magnesium
- stainless steel
13: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
14: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
15: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above
16: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
17: When an inspection is needed, how often must it be done?
- every 24 months
- every 18 months
- annually
- every 36 months
18: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 90%
- 99%
- 80%
- 75%
19: Doors communicating with outside from a mechanical room must be?
- Self-closing, aligned, fire door
- Self-closing, wooden, fire door
- Steel, approved, weather-stripped
- Self-closing, approved, fire door
20: Ammonia (NH3) is a group III refrigerant
- True
- False
21: A class B2 refrigerant is considered
- toxic and somewhat flammable
- non-toxic and non-flammable
- non-toxic and highly flammable
- toxic and non-flammable
22: How are refrigerant blends classified?
- Based on the oil used
- Based on best case Fractionation
- Based on worst case fractionation
- Blends don't have to be classified
23: R-11 belongs to Group
- B-1
- A-1
- B-3
- A-2
24: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
25: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 10
- 24
- 15
- 18