Physics Electronics PMDC Conceptual Practice
PMDC Verified Question 204 of 494
If a full-wave bridge rectifier is supplied by a \( 50\text{ Hz} \) AC line voltage, how many unidirectional voltage pulses are delivered to the load resistor each second?
A
25 pulses/s
B
50 pulses/s
C
75 pulses/s
D
100 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 D: 100 pulses/s
Concept:

A full-wave rectifier converts both the positive and negative half-cycles of the AC input into positive output pulses, delivering two pulses per input cycle.

Formula:

$$\text{Pulses per second} = 2 \times f_{\text{in}} = 2 \times 50 = 100\text{ pulses/s}$$

Solution:

  • During each \( 50\text{ Hz} \) cycle, two conduction events occur: one during the positive half-cycle and one during the negative half-cycle.


  • Therefore, \( 2 \times 50 = 100 \) unidirectional pulses are delivered to the load each second.


Why other options are incorrect:

  • Option A: 25 pulses/s would imply frequency division.
  • Option B: 50 pulses/s is the pulse rate of a half-wave rectifier.
  • Option C: 75 pulses/s is an incorrect intermediate value.

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