Topics: ASHRAE/CMR
1: What is the minimum height refrigeration piping should be placed against walls?
- 6'
- 72"
- Ceiling height
- 7.25'
2: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 22
- 25
- 66
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: 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
5: 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.
- 350
- 50
- 100
- 550
6: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When there are sprinklers above
- When its white
- When it's used as part of a supply or return air system
- When there is a space 6' or more above it
7: R-11 belongs to Group
- B-3
- B-1
- A-2
- A-1
8: What refrigerant doesn't have to be classifted?
- R-711
- R-718
- R-717
- R-134a
9: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- Relief valve
- Circuit Breaker
- Temperature limiter device
- T&P device
10: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 30 days
- 1 week
- 2 months
- 14 days
11: What must be done if refrigeration lines pass through a concrete floor?
- leak checked
- insulated
- installed through a pipe casing
- moisture barrier
12: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
13: How are refrigerant blends classified?
- Based on the oil used
- Based on best case Fractionation
- Based on worst case fractionation
- Blends don't have to be classified
14: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use rupture discs or duel pressure relief valves
- shall use pressure relief devices
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
15: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 15
- 50
- 75
- 20
16: 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.
17: A High-Probability System
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is such that a leak of refrigerant from a failed connection will enter an unoccupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is a system highly likely to leak form a failed connection or component of such system
18: Machinery rooms must be vented to ______?
- neutralizing tank
- basement
- outdoors
- unoccupied spaces
19: Indirect systems using Group II refrigerants
- shall be used for mechanical equipment only
- shall have all refrigerant containing parts except piping, installed in a Class T machine room
- shall be used in refrigeration system in excess of 1,000 lbs
- shall be used in refrigeration system less than 1,000 lbs
20: Liquid level gauges must be provided with what?
- A relief valve
- A low level mark
- Automatic shut-offs
- A red line
21: A class B2 refrigerant is considered
- non-toxic and highly flammable
- toxic and non-flammable
- non-toxic and non-flammable
- toxic and somewhat flammable
22: Dual-pressure relief devices should be installed on
- vessels of 10 cubic feet or less
- vessels of 10 cubic feet or more
- vessels of 3 cubic feet or more
- vessels of 3 cubic feet or less
23: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
24: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of
- the ASME Boiler and Pressure Vessel Code
- Section 11.3.1.5 ASHRAE 15 Standard
- the ANSI Standard 10.7.2
- both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5
25: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-1
- B-2
- A-2
- B-1