Topics: All categories in the pool
1: How is bring measured?
- anemometer
- manometer
- hydrometer
- hygrometer
2: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use fusible plugs
- shall use rupture discs or duel pressure relief valves
- shall use pressure relief devices or fusible plugs
- shall use pressure relief devices
3: Can ammonia be used on domestic system?
- yes, for systems under 10 tons
- no, unless there is proper ventilation system installed
- no
- yes
4: Defined process piping by code CMR (528)
- Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
- Any piping in an industrial space
- Any piping in an industrial or commercial space
- All of the above
5: How many different groups of refrigerants are there?
- 7
- 3
- 15
- 11
6: A 24 volt transformer with a 240 volt primary can handle how many amps?
- There isn't enough information to answer.
- 10 amps
- 24 amps
- 20 amps
7: 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
8: In an electrical circuit, what is potential measured in?
- Ohms
- Herys
- Volts
- Amps
9: A declaration test is needed when the system contains more than
- 55 lbs
- 120 lbs
- 110 lbs
- 65 lbs
10: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
- gate or globe valves
- ball valves
- king valves
- companion or block valves
11: The two float-type metering devices are the
- high-side float and the low-side float
- vapor float and the low-side float.
- liquid float and the low-side float
- liquid float and the vapor float
12: 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.
13: The high side float assembly meters refrigerant into the evaporator through the
- upper chamber of the high side
- lower chamber of the low side
- upper chamber of the low side
- lower chamber of the high side
14: Transformers are rated in
- volts-ohms
- volt-amps
- amps
- volts
15: Lithium-bromide, Li-Br, is best characterized as a
- salt
- soil
- sugar
- sand
16: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 55 lbs
- 660 lbs
- 550 lbs
- 330 lbs.
17: Refrigerants shall be classified by
- color codes
- toxicity and flammability
- requirements for commercial, industrial, and residential occupancies
- maximum permissible quantities of each group
18: If the power element of an expansion valve should lose its charge the valve would
- overfeed the evaporator
- go closed
- go open
- underfeed the evaporator
19: Machinery rooms must be vented to ______?
- outdoors
- neutralizing tank
- unoccupied spaces
- basement
20: The color code of a tank of ammonia is
- lavender
- silver
- white
- light green
21: On a large centrifugal system, what meters the flow to the evaporator?
- Low side float
- Cap tube.
- TXV
- High side float
22: An air conditioning system rated for 36,000 BTU's is equivalent to
- 12,000 tons of cooling
- one ton of cooling
- two tons of cooling
- three tons of cooling
23: R-11 belongs to Group
- A-2
- A-1
- B-1
- B-3
24: Electricity involves the movement of electrons in atoms
- True
- False
25: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above