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  • Question

  • In a single phase full wave controlled rectifier using centre tap transformer, the voltage across each half of secondary is Vm sin ?t. The peak inverse voltage is


  • Options
  • A. 2 Vm
  • B. Vm
  • C. 0.5 Vm
  • D. 0.25 Vm

  • Correct Answer
  • 2 Vm 

    • More questions

    • 1. The number of protons in germanium atom is

    • Options
    • A. 4
    • B. 16
    • C. 28
    • D. 32
      • Discuss
    • 2. A low ratio of the A.C. load impedance of a diode detector results in

    • Options
    • A. diagonal clipping
    • B. poor AGC operation
    • C. poor AF response
    • D. negative peak clipping
      • Discuss
    • 3. To produce magnetic flux, mmf is necessary.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. The units of ?0 and ?r are

    • Options
    • A. H/m for both
    • B. H/m for ?r and no units for ?0
    • C. H/m for ?0 and no units for ?r
    • D. Wb/m for ?0 and no units for ?r
      • Discuss
    • 5. An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10-5 ohms. A micrometer shows that the rectified DC current in this resistance is 30 A. The efficiency of detection is

    • Options
    • A. 34%
    • B. 55.5%
    • C. 68.8%
    • D. 84.7%
      • Discuss
    • 6. Some typical examples of macroscopic quantities are

    • Options
    • A. conductivity
    • B. µr
    • C. dielectric constant
    • D. all of the above
      • Discuss
    • 7. Nichrome is used for

    • Options
    • A. overload line wires
    • B. heater coils
    • C. lamp filaments
    • D. all of the above
      • Discuss
    • 8. Yettrium-iron garnet (Y2Fe5O12) is a soft magnetic material suitable for applications involving

    • Options
    • A. dc
    • B. 50 Hz ac
    • C. ac of a few K Hz
    • D. ac of a few hundred MHz
      • Discuss
    • 9. Which of the following is used in automatic control of street lights?

    • Options
    • A. Thermistor
    • B. Photoconductor
    • C. Transistor
    • D. Varistor
      • Discuss
    • 10. A leaky dielectric has ?r = ?r' - j?r". If a field E is applied, the current component in phase with E is proportional to ?r".

    • Options
    • A. True
    • B. False
      • Discuss

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