Valves that open and close rapidly under the control of electronic circuits are:
A) Step motor valves. B) Pulse-modulated valves.
C) Electronic expansion valves. D) Cross-charged expansion valves.
B
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What is the minimum efficiency of a fossil fuel–burning furnace?
What will be an ideal response?
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Answer the following statement true (T) or false (F)
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A. Excessive heat B. Worn shoes or springs C. Improper brake lathe use D. Tight shoe adjustment
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A pulse-waveform to DC convertor makes use of an integrator:
A) with a time constant shorter than the width of the input pulse. B) with a time constant much wider than the width of the input pulse. C) with an extremely large time constant. D) either B or C
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