Topics: ASHRAE/CMR
1: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
- 10
- 15
- 25
- 20
2: What type of pressure relief device is used on a CO2 system?
- Rupture disk
- Fusible plug
- Glove valve
- Gate valve
3: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-1
- B-1
- A-2
- B-2
4: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 22 lbs
- 6.6 lbs
- 13.9 lbs
- 44 lbs
5: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
- Flush with R-718
- Flush with RX-11
- Flush with ammonia
- Flush with R-11
6: When should a relief valve start to function?
- 10 psi before it's set pressure
- Before the purge station discharges
- At it's set pressure
- Two times it's working pressure
7: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
8: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code
- welder qualified
- licensed technician
- licensed welder
- competent welder
9: What do you need to do when you install a new system?
- Document the superheat and subcooling reading
- Add refrigerant
- Insulate the suction line before you take a superheat reading
- Have it inspected
10: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 550 lbs
- 660 lbs
- 330 lbs.
- 55 lbs
11: _____ and its alloys are suitable for use with ammonia systems.
- Aluminum
- Magnesium
- Zinc
- Copper
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: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- low side of the system
- high side of the system
- the vapor side of the system
- the liquid side of the system
14: A declaration test is needed when the system contains more than
- 65 lbs
- 55 lbs
- 110 lbs
- 120 lbs
15: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
16: When a refrigerating machinery room is used, the emergency procedures shall be posted
- inside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
- on a conspicuous card located near the evaporator
- outside the room, immediately adjacent to each door
17: What type of material can't be used on the outlet of a relief valve?
- PVC
- Magnesium alloy
- Stainless steel
- Copper
18: Ammonia is under what safety classification?
- A3
- B2
- B3
- B1
19: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by
- District Engineering Inspectors
- Commissioned Inspectors
- Master licensed Technician
- both a or b
20: A High-Probability System
- 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
- 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
21: How many gallons of water do you need per pound of ammonia?
- 100
- 1
- 10
- 50
22: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
23: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 36
- 18
- 24
- 48
24: How many refrigerant classifications are there for toxicity?
- 2
- 3
- 5
- 1
25: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 90%
- 100%
- 75%
- 80%