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Assertion: a delay line is placed in the vertical channel of an oscilloscope. Reason: the trigger and sweep circuits take a finite time to start the sweep.

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

Answer: D

Without the delay the edge that started the sweep would already have gone by the time the beam began to move, so the very transition of interest would be missing. Delaying the signal a little longer than the circuits take brings that edge onto the screen.

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