How does a condensing boiler differ from other boilers and why are they used considering that they generally cost more?
What will be an ideal response?
The condensing boiler has extra heat exchanger capacity in the flue that
captures usable heat to the point where water condenses out of the flue gas. The
flue gas is cooled to a lower temperature than in conventional boilers which
considerably raises the efficiency of the boiler.
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What accounts for the flattened slope of the speed torque curve of the series motor in the accompanying figure?
What will be an ideal response?
The National Electrical Code® requires Type NM cable to be secured no more than __________ inches from single-gang nonmetallic device boxes.
a. 6 b. 8 c. 10 d. 12
The navigation system uses all of these sensors EXCEPT ________
A) Air bag sensor B) GPS C) Yaw sensor D) Vehicle speed sensor
Which of the following is a form of electrical heat energy?
A. Nuclear B. Chemical C. Flashover D. Arcing