Topics: ASHRAE/CMR
1: 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.
- 550
- 50
- 100
- 350
2: A declaration test is needed when the system contains more than
- 55 lbs
- 65 lbs
- 120 lbs
- 110 lbs
3: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When there are sprinklers above
- When it's used as part of a supply or return air system
- When its white
- When there is a space 6' or more above it
4: Which refrigerant class listed below is the most flammable?
- A-3
- A-1
- B-2
- C-3
5: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
- institutional occupancy
- commercial occupancy
- public assembly occupancy
- illegal occupancy
6: When air is ducted through a machine room that services occupied space, What must be done?
- Ducted and sealed
- Insulated and cross broke
- Welded and seamed.
- Flanged and gasketed
7: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
8: Single compound Refrigerants are classified by what two criteria?
- Weight and color
- Flammability and toxicity
- Temperature range and hazardousness
- Flammability and temperature range
9: Refrigerants shall be classified by
- toxicity and flammability
- maximum permissible quantities of each group
- requirements for commercial, industrial, and residential occupancies
- color codes
10: All electrical work done on refrigeration systems must comply with
- OSHA
- Department of Energy
- NEC and Massachusetts Modifications
- ASHREA-15 Section 9.2.1
11: A High-Probability System
- is a system highly likely to leak form a failed connection or component of such system
- is such that a leak of refrigerant from a failed connection will enter an unoccupied space
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
12: Pressure vessels having an inside diameter of 6” or less shall be protected by
- a pressure relief device
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- either a fusible plug or a pressure relief device
- a fusible plug
13: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
14: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- higher
- lower
- the same
- there is no Group B1 refrigerants
15: Dual-pressure relief devices should be installed on
- vessels of 3 cubic feet or less
- vessels of 3 cubic feet or more
- vessels of 10 cubic feet or less
- vessels of 10 cubic feet or more
16: A class A3 refrigerant is considered
- toxic and somewhat flammable
- non-toxic but highly flammable
- non-toxic and non-flammable
- toxic and non-flammable
17: A relief valve shall be located at least ___ above grade.
- 15'
- 36'
- 25'
- 10'
18: Which refrigerant replaced R-12?
- R-407A
- R-410A
- R-22
- R-134A
19: What kind of material can't be used on the outlet of a relief valve?
- Stainless Steel
- Copper
- Aluminum
- PVC
20: Ammonia can come in contact with _______ ?
- Aluminum
- Brass
- Copper
- Copper tubing
21: What pipe can not be used for refrigeration?
- L
- M
- N
- K
22: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- “U” or “UM”
- “UL”
- “UV”
- “UM” and “UV”
23: What refrigerant were phased out in 2004?
- R-134a
- R-11
- R-22
- R-12
24: Whoever owns/uses a refrigeration or air conditioning system covered by this code
- must notify the Department of Public Safety prior to starting the system
- shall be licensed by the Commonwealth of Massachusetts according to CMR 522
- shall make application for inspections to the Chief of Inspectors
- None of the above
25: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Place sign, check for leaks, and insulate suction line
- Make sure its compatible, notify owner, and notify AHJ.
- you can never change refrigerants
- Nothing must be done