What is the difference in operating characteristics between centrifugal fans with forward curved blades and centrifugal fans with backward curved blades?

What will be an ideal response?


Air offers more resistance to the forward motion of forward curved blades. They turn slower and make less noise than backward curved blades. Backward curved blades are more efficient, but turn faster and make more noise.

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The present worth of an alternative that provides infinite service is called its:

(a) Net present value (b) Discounted total cost (c) Capitalized cost (d) Perpetual annual cost

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During the MMPT P&O process, how does a charge controller determine when the MMP has been reached?

What will be an ideal response?

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Explain infinite resistance

What will be an ideal response?

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Suppose the data sheet for a standard TTL four NOR gate IC lists values of: Icch = 6 ma, Iccl = 16 ma, and Vcc = 5 v. What is the average power dissipated by each gate?

A) 13.75 mw B) 50 mw C) 12.50 mw D) 55 mw

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