Topics: All categories in the pool
1: A professional or office building would be considered what type of occupancy?
- business
- mercantile
- public assembly
- commercial
2: Halogen refrigerants are corrosive to which type of metal?
- magnesium
- copper
- black iron
- stainless steel
3: 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
4: What is the leaving chilled water set point for water chiller systems?
- 45F
- 55F
- 38F
- 66F
5: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
6: 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
7: On a single phase motor, when does the start winding cut out?
- At 50% of its full rated speed
- At 25% of its full rated speed
- At 75% of its full rated speed
- Start windings do no cut-out of the run cycle
8: A start capacitor in series with a start winding will
- increase running efficiency
- increase the amp draw of the motor
- decrease the amp draw of the motor
- increase starting torque
9: In designing duct work, pressure and ______ need to be considered
- length
- CFM
- duct sealant used
- all of the above
10: What device measures the specific gravity of a substance?
- Manometer
- Thermometer
- Hydrometer
- Hygrometer
11: Which is the lowest vacuum?
- 10 psia
- 5 psig
- 1,000 Microns
- 5" hg
12: Heat cannot of itself, pass from a
- cold to a warmer body
- warm to a colder body
- state of hot energy to a state of cold energy
- None of the above
13: Volts x amps equals
- Impedance
- Watts
- Inductance
- Ohms Law
14: Oils, classified as to source, are
- animal, vegetable, and castor
- animal, vegetable, and mineral
- naphthalene, paraffin, and castor
- naphthalene, mixed, and paraffin
15: 1 Watt = ______ BTU's?
- 4.482
- 3.412
- 7.216
- 12
16: R-12 is
- dichloromethane
- trichlorofluoromethane
- dichlorodifluoromethane
- dichlorofluoromethane
17: 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
18: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the low side
- the aggregate of the high side and low side
- the high side
- 2.5 times the design pressure
19: What refrigerant doesn't have to be classified?
- R-422A
- R-717
- R-134A
- R-718
20: In an A/C unit, dirty filters will cause
- high discharge pressure
- high suction pressur
- low oil pressure
- low suction pressure
21: What is used to check very low air pressures in air conditioning duct?
- Manometer
- Barometer
- Vacuum gauge
- Anemomter
22: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
23: The location of the thermal bulb for the TXV on the evaporator effects
- both the pressure and temperature in the feeler bulb
- the amount of superheat required to operate the TXV
- the amount of liquid in the evaporator
- the amount of gas in the evaporator
24: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- Circuit Breaker
- T&P device
- Relief valve
- Temperature limiter device
25: The rupture disc on a low-pressure chiller typically releases pressure at
- 5 psig
- 10 psig
- 15 psig
- 0 psig