Topics: All categories in the pool
1: Which of the following is not an air velocity meter?
- Hydrometer
- Anemotherm
- Anemometer
- Velometer
2: The discharge relief valve is located (9.4.6)
- on top of the condensor
- between the compressor and reciever
- between the compressor and the stop valve
- between the compressor and oil separator
3: Trichlorofluoromethane is the name of what refrigerant?
- R-11
- R-113
- R-502
- R-12
4: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is
- 21F
- 9F
- 29F
- 11F
5: One watt of electrical energy in a resistive heater will provide _____ BTU/hr
- 34.15
- 6.830
- 16.64
- 3.415
6: Each machinery room shall contain
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
- smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
- high and low pressure controls
7: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
8: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the outdoors
- the mechanical room housing the refrigeration system
- Machinery rooms need not be vented
- the return air ducted system
9: Volts x amps equals
- Inductance
- Ohms Law
- Watts
- Impedance
10: _____ and its alloys are suitable for use with ammonia systems.
- Copper
- Magnesium
- Aluminum
- Zinc
11: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Zinc
- Magnesium
- Nickel
- Copper
12: Doors communicating with outside from a mechanical room must be?
- Steel, approved, weather-stripped
- Self-closing, approved, fire door
- Self-closing, aligned, fire door
- Self-closing, wooden, fire door
13: How do you find net oil pressure on a compressor?
- discharge pressure - suction pressure
- gross oil pressure - suction pressure
- gross oil pressure - discharge pressure
- all of the above
14: 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
15: Which refrigerant is lighter than air?
- R-717
- R-123
- R-134a
- R-11
16: A direct system
- is a self-contained complete factory made and tested system
- is one which encloses a separate body of evaporative refrigerant
- is on where brine is cooled & circulated to the space refrigerated
- is where the refrigerant comes in contact with the space refrigerated
17: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
- 400
- 100
- 350
- 250
18: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- “UV”
- “U” or “UM”
- “UL”
- “UM” and “UV”
19: The maximum permissible amperage draw for a 40VA transfomer with a secondary voltage of 24V is
- 1.2
- .8
- 1.7
- .1
20: Gauge pressure is
- Force of pressure above that of atmosphere
- Absolute pressrue
- Atmospheric pressure
- Barometric pressure
21: 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.
- Lithium bromide
- HCFC-123
- ammonia
- CFC-11
22: If the suction pressure is low and the evaporator temperature high, the cause will be a?
- starved evaporator
- compressor suction valve stuck open
- overcharged
- too small evaporator
23: A start capacitor is wired in _____ with the start windings.
- series
- parallel
- series-parallel
- junction
24: What is the purpose of a surge capacitor on a contactor?
- to keep the contactor pulled in
- to protect low voltage equipment
- to provide smoother start/stops
- to balance the sine waves
25: 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