Topics: ASHRAE/CMR
1: What must be done to refrigerant pipes before being buried?
- Coated
- Encased
- Certified
- Leaked checked
2: 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
3: When should a relief valve start to function?
- 10 psi before it's set pressure
- Before the purge station discharges
- Two times it's working pressure
- At it's set pressure
4: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 1 week
- 14 days
- 2 months
- 30 days
5: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- shall be prohibited
- of Group B2 refrigerant shall be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- shall not be prohibited
6: Pressure vessels having an inside diameter of 6” or less shall be protected by
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- a pressure relief device
- either a fusible plug or a pressure relief device
- a fusible plug
7: 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
8: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
9: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
10: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
11: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
- business occupancy
- public assembly occupancy.
- commercial occupancy
- mercantile occupancy
12: 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
13: What type of relief valve is used on a CO2 system?
- gate valve
- glove disc
- fusible plug
- rupture disc
14: Refrigerants shall be classified by
- color codes
- maximum permissible quantities of each group
- requirements for commercial, industrial, and residential occupancies
- toxicity and flammability
15: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the mechanical room housing the refrigeration system
- the outdoors
- Machinery rooms need not be vented
- the return air ducted system
16: When a refrigerating machinery room is used, the emergency procedures shall be posted
- inside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
- on a conspicuous card located near the evaporator
- outside the room, immediately adjacent to each door
17: How many gallons of water do you need per pound of ammonia?
- 50
- 100
- 1
- 10
18: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
19: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 22 lbs
- 44 lbs
- 13.9 lbs
- 6.6 lbs
20: How much clearance do you need around the perimeter of electrical panels?
- 12"
- 24"
- 18"
- 36"
21: Fusible plugs shall not be used with pressure vessels of
- 3 cubic feet or less
- 15 cubic feet or more
- 15 square feet or less
- 3 cubic feet or more
22: How far from the ground does a relief valve need to be?
- At least 15' above grade
- Not more than 3' above grade
- At least 25' above grade
- At least 20' above grade
23: A class B2 refrigerant is considered
- toxic and non-flammable
- non-toxic and highly flammable
- non-toxic and non-flammable
- toxic and somewhat flammable
24: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 90%
- 80%
- 75%
- 99%
25: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 18
- 10
- 15
- 24