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Statement I: A stability factor of unity is the ideal.

Statement II: A stability factor of zero would be better still.

In the light of the above statements, choose the correct answer.

  • A.Both Statement I and Statement II are incorrect
  • B.Statement I is incorrect but Statement II is correct
  • C.Statement I is correct but Statement II is incorrect
  • D.Both Statement I and Statement II are correct

Answer: C

The first is correct and the second is impossible: the leakage current is itself part of the collector current, so a change in it must produce at least an equal change in the total, putting a floor of one on the factor. Recognising that a figure of merit has a theoretical floor set by definition, rather than by engineering limits, prevents effort being spent chasing an unreachable target.

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