Topics: ASHRAE/CMR
1: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
- the low-pressure side of the system
- the high side of the system
- the liquid receiver
- both a and c are correct
2: All electrical work done on refrigeration systems must comply with
- OSHA
- Department of Energy
- NEC and Massachusetts Modifications
- ASHREA-15 Section 9.2.1
3: What refrigerant were phased out in 2004?
- R-12
- R-11
- R-134a
- R-22
4: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
5: What is an example of institutional occupancy?
- Football stadium
- Hospital
- Dorms
- Shopping mall
6: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
7: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Muffler
- Foot valve
- Moisture indicator
- Stop valve
8: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- there is no Group B1 refrigerants
- higher
- lower
- the same
9: A declaration test is needed when the system contains more than
- 120 lbs
- 55 lbs
- 110 lbs
- 65 lbs
10: No open flames are allowed in the machinery room unless?
- Never can be allowed
- Only when combustion air is provided from outside of the machinery room
- Approved by the authorized person
- Approved by the installing contractor
11: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.
- 3.0, 3.5
- 6.6, 6.6
- 2.5, 2.5
- 2.5, 3.0
12: A class B2 refrigerant is considered
- non-toxic and highly flammable
- toxic and non-flammable
- toxic and somewhat flammable
- non-toxic and non-flammable
13: What would be the classification of a prison?
- Place of assembly
- Institutional
- Industrial
- Large mercantile
14: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
15: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 1
- 2.2
- 1.5
- 1.2
16: 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.
- “UM” and “UV”
- “UV”
- “UL”
- “U” or “UM”
17: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When it's used as part of a supply or return air system
- When its white
- When there is a space 6' or more above it
- When there are sprinklers above
18: Ammonia is under what safety classification?
- A3
- B2
- B3
- B1
19: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-11
- R-113
- R-22
- R-12
20: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
- 350
- 100
- 400
- 250
21: 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
22: Doors communicating with outside from a mechanical room must be?
- Steel, approved, weather-stripped
- Self-closing, aligned, fire door
- Self-closing, approved, fire door
- Self-closing, wooden, fire door
23: Which refrigerant class listed below is the most flammable?
- A3
- B2
- A2
- C3
24: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
25: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's a non-flammable refrigerant
- Because it's water
- Because it's cheap