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Standard XII
Physics
NCERT
Question

If the input frequency of half-wave rectifier is n Hz ac, then its output is
  1. a constant dc.
  2. 0.5n Hz pulsating dc.
  3. n Hz pulsating dc.
  4. 2n Hz pulsating dc.

A
0.5n Hz pulsating dc.
B
n Hz pulsating dc.
C
2n Hz pulsating dc.
D
a constant dc.
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Solution
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A pulsating direct current may change in value, i.e., be always present but at different levels, or it may be interrupted completely. The changes may be irregular or at regular intervals (at a specific frequency), but the current never changes direction.
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