Topics: ASHRAE/CMR
1: 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
- 6.6, 6.6
- 2.5, 3.0
- 3.0, 3.5
2: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
3: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- over pressure protection as well as a temperature protection device
- over pressure protection and a rupture disc
- over pressure protection
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
4: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 5
- 3
- 1
- 2
5: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
6: How are refrigerant blends classified?
- Based on worst case fractionation
- Based on best case Fractionation
- Based on the oil used
- Blends don't have to be classified
7: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
8: Fusible plugs shall not be used with pressure vessels of
- 15 square feet or less
- 3 cubic feet or more
- 3 cubic feet or less
- 15 cubic feet or more
9: What type of copper is not permitted on refrigeration systems?
- Type L
- Type K
- Type N
- Type M
10: Class A refrigerants are considered
- non-flammable
- non-toxic
- flammable
- toxic
11: The color code of a tank of ammonia is
- silver
- white
- light green
- lavender
12: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
13: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
14: How many groups of refrigerants are there?
- 1
- 3
- 7
- 5
15: What is not a requirement of a Class T machine room?
- Fire hose connected to the building fire protection system.
- Self-closing doors
- Tight fitting doors
- Automatic ventilation
16: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 22 lbs
- 13.9 lbs
- 44 lbs
- 6.6 lbs
17: Relief valves are rated in
- pounds of air per minute
- pounds of air per hour
- gallons of water per hour
- gallons of water per minute
18: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 15
- 20
- 50
- 75
19: B3 refrigerants are considered
- non-toxic but non-flammable
- toxic but non-flammable
- toxic and highly flammable
- non-toxic but flammable
20: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-1
- B-2
- A-2
- A-1
21: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- 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
- shall be inspected by the Boiler of Inspectors bi-annually
- does not require a pressure-limiting device
22: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 22
- 50
- 25
- 66
23: Who is permitted to access a refrigeration machine room?
- Contractors only
- Any employee
- Anyone, it's a completely safe area
- Authorized persons only
24: Name three things that must be done when changing refrigeration lubricant?
- Make sure it's compatible, notify owner, notify AHJ
- Nothing must be done
- You can't change lubricants.
- Place sign, check for leaks, insulate
25: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 50
- 350
- 550
- 100