Physics Electronics PMDC Conceptual Practice
PMDC Verified Question 203 of 494
If a half-wave rectifier is supplied by a \( 50\text{ Hz} \) AC line voltage, how many positive voltage pulses are delivered to the load resistor each second?
A
25 pulses/s
B
100 pulses/s
C
50 pulses/s
D
200 pulses/s
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: 50 pulses/s
Concept:

A half-wave rectifier conducts during only one half-cycle, producing one output pulse for each full AC input cycle.

Formula:

$$\text{Pulses per second} = f_{\text{in}} = 50\text{ pulses/s}$$

Solution:

  • With an input frequency of \( 50\text{ Hz} \) (50 cycles per second), the diode conducts during 50 positive half-cycles each second.


  • Thus, exactly 50 pulses per second appear across the load.


Why other options are incorrect:

  • Option A: 25 pulses/s would mean half the input cycles are missing.
  • Option B: 100 pulses/s is the pulse rate of a full-wave rectifier.
  • Option D: 200 pulses/s corresponds to a 4-phase polyphase rectifier.

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