Topics: ASHRAE/CMR
1: 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
2: Doors communicating with outside from a mechanical room must be?
- Self-closing, approved, fire door
- Self-closing, aligned, fire door
- Steel, approved, weather-stripped
- Self-closing, wooden, fire door
3: When should a relief valve start to function?
- Before the purge station discharges
- At it's set pressure
- 10 psi before it's set pressure
- Two times it's working pressure
4: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- place sign, check for leaks, insulate
- nothing must be done
- make sure it's compatible, notify owner, notify A.H.J
- you can't change refrigerants
5: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- higher
- there is no Group B1 refrigerants
- lower
- the same
6: Can ammonia be used on domestic system?
- yes
- no
- no, unless there is proper ventilation system installed
- yes, for systems under 10 tons
7: How many refrigerant classifications are there for toxicity?
- 1
- 3
- 5
- 2
8: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 1000F
- 600F
- 800F
- 700F
9: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Classifed
- Insulated and installed in a pipe duct (Encased)
- Leak checked
- Certified
10: How much refrigerant can be stored in a mechanical room outside of the system?
- 200
- 330
- 150
- 100
11: What kind of material can't be used on the outlet of a relief valve?
- PVC
- Aluminum
- Stainless Steel
- Copper
12: A declaration test is needed when the system contains more than
- 110 lbs
- 65 lbs
- 120 lbs
- 55 lbs
13: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
14: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
15: Defined process piping by code CMR (528)
- Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
- Any piping in an industrial space
- Any piping in an industrial or commercial space
- All of the above
16: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 18
- 24
- 10
- 15
17: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- the same
- lower
- higher
- there is no Group B1 refrigerants
18: What is not a requirement of a Class T machine room?
- Fire hose connected to the building fire protection system.
- Tight fitting doors
- Automatic ventilation
- Self-closing doors
19: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.
20: B3 refrigerants are considered
- non-toxic but flammable
- non-toxic but non-flammable
- toxic but non-flammable
- toxic and highly flammable
21: R-22 is considered a(n)
- HCFCH
- CFC
- HCFC
- HFC
22: How far from the ground does a relief valve need to be?
- Not more than 3' above grade
- At least 20' above grade
- At least 25' above grade
- At least 15' above grade
23: Machinery rooms must be vented to ______?
- neutralizing tank
- basement
- outdoors
- unoccupied spaces
24: NH3 is
- ammonia
- lithium bromide
- R-718
- R-508A
25: Large mercantile occupancy is
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise