Topics: ASHRAE/CMR
1: A restaurant is classified as a
- mixed occupancy
- commercial occupancy
- public assembly occupancy
- large mercantile occupancy
2: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
- HCFC-123
- Lithium bromide
- CFC-11
- ammonia
3: R-123 belongs to Group
- A-3
- B-2
- B-3
- B-1
4: A Low-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 can not enter the occupied space
- 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 the occupied space
5: Single compound Refrigerants are classified by what two criteria?
- Weight and color
- Flammability and temperature range
- Flammability and toxicity
- Temperature range and hazardousness
6: Evaporators within 18" of a heating coil must be equipped with a
- zone valve
- low limit control
- high limit control
- pressure relief device
7: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
8: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 66
- 22
- 25
9: Can ammonia be used on domestic system?
- yes
- no
- yes, for systems under 10 tons
- no, unless there is proper ventilation system installed
10: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- shall be prohibited
- shall not be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- of Group B2 refrigerant shall be prohibited
11: What do you need to do when you install a new system?
- Insulate the suction line before you take a superheat reading
- Have it inspected
- Add refrigerant
- Document the superheat and subcooling reading
12: Refrigerants shall be classified by
- color codes
- requirements for commercial, industrial, and residential occupancies
- maximum permissible quantities of each group
- toxicity and flammability
13: A positive displacement compressor is
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
- is a reciprocating type compressor with 2 or more pistons
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
14: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
- 55
- 75
- 15
- 50
15: No open flames are allowed in the machinery room unless?
- Approved by the installing contractor
- Only when combustion air is provided from outside of the machinery room
- Never can be allowed
- Approved by the authorized person
16: What is an example of institutional occupancy?
- Football stadium
- Shopping mall
- Hospital
- Dorms
17: What type of relief valve is used on a CO2 system?
- gate valve
- glove disc
- rupture disc
- fusible plug
18: The color code of a tank of ammonia is
- silver
- white
- lavender
- light green
19: Name three things that must be done when changing refrigeration lubricant?
- You can't change lubricants.
- Place sign, check for leaks, insulate
- Nothing must be done
- Make sure it's compatible, notify owner, notify AHJ
20: Class A refrigerants are considered
- non-toxic
- toxic
- flammable
- non-flammable
21: Where a refrigeration or air conditioning system is installed,
- the form or certificate shall be authorized by the Department of Public Safety
- it shall not be operated below prescribed pressuers
- A field inspection shall be made before it is put into service
- The company who installed the system must notify the fire department in the jurisdiction where installed
22: What is R-22?
- Chlorodifluoromethane
- HFC
- Chlorofluoromethane
- CCFCM
23: 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
- competent welder
- licensed welder
24: 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
25: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above