Topics: ASHRAE/CMR
1: A class B1 refrigerant is considered
- non-toxic but highly flammable
- toxic but non-flammable
- toxic and somewhat flammable
- non-toxic and non-flammable
2: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- the liquid side of the system
- the vapor side of the system
- low side of the system
- high side of the system
3: Name three things that must be done when changing refrigeration lubricant?
- Nothing must be done
- You can't change lubricants.
- Place sign, check for leaks, insulate
- Make sure it's compatible, notify owner, notify AHJ
4: R-717 is
- water
- ammonia
- trichloromethane
- carbon dioxide
5: 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.
- 2.5, 2.5
- 2.5, 3.0
- 6.6, 6.6
- 3.0, 3.5
6: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
- 15
- 75
- 50
- 55
7: 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
8: Class T machine room
- shall have refrigerant leak detecting systems installed inside and outside the room
- shall have remote controls to stop the action of the refrigerant compressor
- shall include closets used for setting equipment
- has no flame producing apparatus permanently installed
9: What type of relief valve is used on low pressure centrifugal compressor systems?
- Spring-loaded relief valve
- Rupture disc
- Purge relief
- None of the above
10: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 3
- 2
- 5
- 1
11: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
12: 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
13: 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
14: Each machinery room shall contain
- smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
- high and low pressure controls
15: Which refrigerant replaced R-12?
- R-134A
- R-407A
- R-410A
- R-22
16: What is an egress?
- An escape route
- An entrance or exit
- A code violation
- A valve put on the low side of the system to prevent frosting
17: No open flames are allowed in the machinery room unless?
- Approved by the installing contractor
- Approved by the authorized person
- Never can be allowed
- Only when combustion air is provided from outside of the machinery room
18: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- does not require a pressure-limiting device
- shall be inspected by the Boiler of Inspectors bi-annually
- shall have a pressure limiting device and a pressure relief valve installed
- shall have a pressure limiting device installed on the high side of the system
19: Refrigerants shall be classified by
- color codes
- maximum permissible quantities of each group
- requirements for commercial, industrial, and residential occupancies
- toxicity and flammability
20: Can ammonia be used on domestic system?
- yes, for systems under 10 tons
- yes
- no, unless there is proper ventilation system installed
- no
21: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Leak checked
- Insulated and installed in a pipe duct (Encased)
- Certified
- Classifed
22: What pipe can not be used for refrigeration?
- L
- K
- N
- M
23: A relief valve shall be located at least ___ above grade.
- 15'
- 36'
- 25'
- 10'
24: What type of relief valve is used on a CO2 system?
- gate valve
- glove disc
- fusible plug
- rupture disc
25: 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