Water and air leakage between the rooftop unit and the rooftop curb are prevented by:
A) UL-rated duct tape applied from the inside of the curb.
B) UL-rated duct tape applied over the outside of the curb.
C) UL-rated duct tape applied to both the inside and outside of the curb.
D) Gasket material between the curb and the unit.
[Ques. 2] Rooftop units can have the ductwork connected to either:
A) The bottom or side of the unit. B) The top or side of the unit.
C) The main unit or a satellite blower coil. D) The bottom or top of the unit.
[Ques. 3] The difference between 80 percent efficiency furnaces and 90 percent efficiency furnaces is that 90 percent efficiency furnaces:
A) Use more combustion air per 1,000 BTU firing rate.
B) Have an extra recuperative heat exchanger that condenses water out of the flue gas.
C) Burn more gas to increase the heat exchanger temperatures.
D) Use more efficient air filters.
[Ques. 4] Most flake ice machines utilize this type of evaporator.
A) A vertical, cylindrical, tube-shaped stainless steel evaporator
B) A vertical, rectangular, stainless steel evaporator
C) A horizontal, cylindrical, tube-shaped stainless steel evaporator
D) A horizontal, rectangular, stainless steel evaporator
[Ques. 5] The line current of a delta-wound three-phase motor is:
A) 1.5 times the phase current. B) Equal to the phase current.
C) 3 times the phase current. D) 1.73 times the phase current.
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