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Assertion: a deeper depth of discharge always makes better use of a battery. Reason: more of the stored energy is delivered on each cycle.

  • A.the assertion is true but the reason given for it is false
  • B.the assertion is false although the reason offered is a true statement in itself
  • C.both the assertion and the reason are true and the reason explains the assertion
  • D.both the assertion and the reason are true but the reason does not explain the assertion

Answer: B

More energy per cycle is indeed delivered, but cycle life falls faster than the depth rises, so the total energy the battery delivers over its whole life may be less. The optimum is a moderate depth, not the deepest permitted.

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