Topics: All categories in the pool
1: What is considered a cooling agent?
- any liquid used for the transmission of heat when condensation occur
- any liquid used for the transmission of heat without condensation
- any liquid used for the transmission of heat when vaporization occurs
- any liquid used for the transmission of heat without vaporization
2: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- low pressure
- design pressure
- critical pressure
- high pressure
3: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
4: What is the leaving chilled water set point for water chiller systems?
- 45F
- 55F
- 38F
- 66F
5: Can ammonia be used on domestic system?
- yes, for systems under 10 tons
- no, unless there is proper ventilation system installed
- no
- yes
6: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- no flames shall be permitted
- the owner shall be informed
- gas masks must be worn
- explosion precautions must be taken
7: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
8: 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
9: When can recovered refrigerants be reused?
- They can't
- Only when used in original owner's equipment
- Only if used in 30 days of recovery
- None of the above
10: A mixed occupancy occurs when two or more occupancies are located with the same building
- true
- false
11: A machine room with a refrigerant system using ammonia shall
- be provided with a continuously operated ventilation system
- be considered a non-hazardous location in accordance with National Electrical code
- have no flame producing apparatus permanently installed and operated
- All of the above
12: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 22
- 50
- 18
- 33
13: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- the vapor side of the system
- low side of the system
- the liquid side of the system
- high side of the system
14: 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
- licensed technician
- licensed welder
- competent welder
- welder qualified
15: When air is ducted through a machine room that services occupied space, What must be done?
- Insulated and cross broke
- Welded and seamed.
- Flanged and gasketed
- Ducted and sealed
16: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?
- Rotating vanes
- Fan-like action
- Nesting scrolls
- Suction and discharge valves
17: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- regularly
- bi-annually
- annually
- quarterly
18: The instrument used to measure the specific gravity of absorption chiller solutions is the
- hydrometer
- anemometer
- Psychrometer
- refractometer
19: Where a refrigeration or air conditioning system is installed,
- it shall not be operated below prescribed pressuers
- A field inspection shall be made before it is put into service
- the form or certificate shall be authorized by the Department of Public Safety
- The company who installed the system must notify the fire department in the jurisdiction where installed
20: If the power element on an expansion valve should lose its charge, the valve would
- Over feed
- Stay open
- Close
- Under feed
21: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
22: When a refrigerating machinery room is used, the emergency procedures shall be posted
- on a conspicuous card located near the evaporator
- outside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
- inside the room, immediately adjacent to each door
23: A relief valve discharge capacity is rated in
- PSIA
- temperature minus pounds of air per second divided by release rate squared
- Pounds of air per minute.
- PSIG
24: What does safe access mean?
- Locked doors
- OSHA approved
- A clear unobstructed path to the equipment and controls
- Well-lit exit signs
25: The amount of heat required to raise the temperature of 1 lb of water 1F is?
- The rate of conduction
- 1 Therm
- 1 Kelvin
- 1 BTU