Physics Electronics PMDC Conceptual Practice
PMDC Verified Question 85 of 494
A full-wave rectifier is supplied by a mains line frequency of \( 60\text{ Hz} \). The total number of rectified DC voltage pulses delivered to the load in one second is:
A
\( 60\text{ pulses} \)
B
\( 120\text{ pulses} \)
C
\( 30\text{ pulses} \)
D
\( 240\text{ pulses} \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: \( 120\text{ pulses} \)
Concept:

A full-wave rectifier converts each complete AC cycle (containing one positive and one negative half-cycle) into two distinct positive DC pulses.

Formula:

$$\text{Number of pulses per second} = 2 \times f_{\text{in}}$$

Solution:

  • With an input frequency of \( f_{\text{in}} = 60\text{ Hz} \) (60 complete cycles per second):


  • $$\text{Pulses per second} = 2 \times 60 = 120\text{ pulses/second}$$


Why other options are incorrect:

  • Option A: \( 60\text{ pulses} \) is delivered by a half-wave rectifier.


  • Option C: \( 30\text{ pulses} \) would result from a \( 30\text{ Hz} \) half-wave supply.


  • Option D: \( 240\text{ pulses} \) would require a \( 120\text{ Hz} \) AC line input.

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