Topics: All categories in the pool
1: Evaporators within 18" of a heating coil must be equipped with a
- high limit control
- pressure relief device
- low limit control
- zone valve
2: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of
- moisture in the system
- not enough oil in the system
- low head pressure
- oil in evaporator
3: 746 watts is equal to
- Pi
- 10 hp
- 1 hp
- 100 hp
4: If the suction pressure is low and the evaporator temperature high, the cause will be a?
- starved evaporator
- compressor suction valve stuck open
- too small evaporator
- overcharged
5: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
6: How many volts would you read on a 480V system phase to phase?
- 0
- 480
- 1/3 the voltage
- 277
7: 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
8: The reversing valve is commonly used
- when the code requires a check valve
- on commercial system that involve two different temperatures
- on multiple compressor systems
- on all heat pumps
9: How many refrigerant classifications are there for toxicity?
- 5
- 2
- 3
- 1
10: In an A/C unit, dirty filters will cause
- high discharge pressure
- high suction pressur
- low oil pressure
- low suction pressure
11: 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
12: The solution that is pumped into the concentrator in an absorption chiller is referred to as the
- weak solution
- absorbed solution
- concentrated solution
- strong solution
13: The Board of Boilers adopts by reference
- the MACS Pressure Vessel Code of Massachusetts
- MSCA Code
- the 1997 ANSI/ASHRAE Safety Code
- Montreal Protocol Safety Code
14: "E" represents _____ in the Watt's law formula.
- reactance
- amperage
- watts
- voltage
15: On cooling towers, what causes the condenser water to drop
- tower fans
- evaporation of the water droplets
- ambient temperatures
- sensible heat
16: Suction line oil traps should be installed when the condenser is
- more than 100' away from the evaporator
- on the third floor roof and the evaporator is in the basement
- located outside the operates in temperatures below 35F
- in the basement and the evaporator is on the third floor
17: Pressure vessels with an internal volume of 3 cubic feet or less
- do not need pressure relief protection
- shall use pressure relief devices or fusible plugs
- shall use pressure relief devices
- shall use fusible plugs
18: One atmosphere equals
- 14.7
- 0 psia
- 0 psig
- 29.4
19: Viscosity is
- the ability of oil to flow
- measure of weight
- a measure of heat content
- the coefficient of external friction
20: Transformers are rated in
- volts-ohms
- volt-amps
- amps
- volts
21: Fusible plugs shall not be used with pressure vessels of
- 3 cubic feet or more
- 3 cubic feet or less
- 15 square feet or less
- 15 cubic feet or more
22: What device measures the specific gravity of a substance?
- Manometer
- Thermometer
- Hydrometer
- Hygrometer
23: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
- the low-pressure side of the system
- the high side of the system
- the liquid receiver
- both a and c are correct
24: Total heat of a substance is considered
- sensible heat
- specific heat
- empathetical
- enthalpy
25: High side floats are used on centrifugal chiller systems are are considered critically charged systems.
- True
- are obsolete.
- False
- depends on the type of refrigerant being used