Topics: ASHRAE/CMR
1: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 18
- 36
- 24
- 48
2: Halogen refrigerants are corrosive to which type of metal?
- copper
- stainless steel
- black iron
- magnesium
3: A pressure relief should be located at least _______ from windows and doors.
- 30'
- 20'
- 15'
- 25'
4: 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
5: A High-Probability System
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- 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 a system highly likely to leak form a failed connection or component of such system
6: What must be done to refrigerant pipes before being buried?
- Coated
- Leaked checked
- Encased
- Certified
7: Pressure vessels with an internal volume of 3 cubic feet or more
- do not need pressure relief protection
- shall use fusible plugs
- shall use pressure relief devices
- shall use pressure relief devices or fusible plugs
8: Where are the three places that the discharge from an ammonia relief valve be piped?
- To chemical neutralizing tank only
- Underground, into drain, into mechanical room
- Atmosphere, Tank containing water, where the AHJ indicates.
- None of the above.
9: 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.
10: Fusible plugs shall not be used with pressure vessels of
- 15 square feet or less
- 3 cubic feet or less
- 15 cubic feet or more
- 3 cubic feet or more
11: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
- business occupancy
- commercial occupancy
- public assembly occupancy.
- mercantile occupancy
12: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- phosgene gas sening
- A group sensing
- refrigerant sensing
- CO Sensing
13: What is a Category "M" fluid?
- A typical refrigerant used on newer air conditioning and heat pump systems
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and the designed temperature is between -20F to 366F
- Any fluid that exceeds 150 psig and has design temperatures over 366F
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
14: A class A3 refrigerant is considered
- toxic and somewhat flammable
- non-toxic and non-flammable
- non-toxic but highly flammable
- toxic and non-flammable
15: The color code of a tank of ammonia is
- lavender
- silver
- white
- light green
16: What refrigerant doesn't have to be classifted?
- R-711
- R-717
- R-718
- R-134a
17: What type of pressure relief device is used on a CO2 system?
- Gate valve
- Rupture disk
- Fusible plug
- Glove valve
18: A relief valve shall be located at least ___ above grade.
- 15'
- 10'
- 25'
- 36'
19: When air is ducted through a machine room that services occupied space, What must be done?
- Flanged and gasketed
- Insulated and cross broke
- Welded and seamed.
- Ducted and sealed
20: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- place sign, check for leaks, insulate
- make sure it's compatible, notify owner, notify A.H.J
- you can't change refrigerants
- nothing must be done
21: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)
- Pressure gauge
- Temperature gauge
- Sight glass gauge
- All of the above
22: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use fusible plugs
- shall use pressure relief devices
- shall use rupture discs or duel pressure relief valves
- shall use pressure relief devices or fusible plugs
23: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- regularly
- annually
- bi-annually
- quarterly
24: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 2 months
- 14 days
- 1 week
- 30 days
25: What type of copper is not permitted on refrigeration systems?
- Type N
- Type K
- Type L
- Type M