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Electronic Devices question

2005 · Shift 0 · Q116
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Electronic Devices question

2005 · Shift 0 · Q116

JEE MainPhysicsElectronic DevicesMCQ+4 / −1
In a full wave rectifier circuit operating from 50Hz50Hz50Hz mains frequency, the fundamental frequency in the ripple would be
  1. A
    25Hz25Hz25Hz
  2. B
    50Hz50Hz50Hz
  3. C
    70.7Hz70.7Hz70.7Hz
  4. D
    100Hz100Hz100Hz
View written solutionFree

Correct answer: D

  1. In a full wave rectifier, both the positive and negative half-cycles of the AC input are used.

  2. If the input AC frequency is f=50 Hzf = 50\,\text{Hz}f=50Hz, then:

    • one half-cycle occurs every 12f\frac{1}{2f}2f1​ seconds,
    • after full-wave rectification, the output pulses occur twice in each input cycle.

  3. Therefore, the ripple frequency is fr=2f=2×50=100 Hzf_r = 2f = 2 \times 50 = 100\,\text{Hz}fr​=2f=2×50=100Hz

  4. Hence, the fundamental frequency present in the ripple is 100 Hz100\,\text{Hz}100Hz.

  5. Checking options:

    • A: 25 Hz25\,\text{Hz}25Hz — incorrect
    • B: 50 Hz50\,\text{Hz}50Hz — incorrect
    • C: 70.7 Hz70.7\,\text{Hz}70.7Hz — incorrect
    • D: 100 Hz100\,\text{Hz}100Hz — correct

Therefore, the correct answer is D.

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