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  • Question

  • The phenomenon of overlap in converter operation due to


  • Options
  • A. source resistance
  • B. source inductance
  • C. both source resistance and source inductance
  • D. high value of firing angle

  • Correct Answer
  • source inductance 

    Explanation
    Source inductance delays turn off and hence causes overlap.

    More questions

    • 1. The number of PM radio channels which can be accommodated in a spectrum of 300 MHz is about

    • Options
    • A. 10
    • B. 100
    • C. 500
    • D. 1500
      • Discuss
    • 2. What are the values of Emax and Emin displayed on the oscilloscope, when a 1 kV P-P carries is modulated to 50%?

    • Options
    • A. 2 kV, 0.5 kV
    • B. 1 kV, 0.5 kV
    • C. 0.75 kV, 0.25 kV
    • D. 0.5 kV, 1.5 kV
      • Discuss
    • 3. For air filled circular waveguides

    • Options
    • A. the attenuation due to imperfect conducting walls is negligible
    • B. the attenuation due to imperfect dielectric is negligible
    • C. both the attenuation i.e. due to imperfect conducting walls and due to imperfect dielectric are significant
    • D. the total attenuation is almost zero
      • Discuss
    • 4. When .4546 E 5 and .5433 E 7 are to be added in normalized floating point mode

    • Options
    • A. none of the numbers is changed to any other form
    • B. .4546 E 5 is changed .004546 E 7 and .5433 E 7 is not changed
    • C. .5433 E 7 is changed to 54.33 E 5 and .4546 E 5 is not changed
    • D. both the numbers are changed and their exponents are made equal to 6
      • Discuss
    • 5. A short circuited stub is preferred to an open circuited stub because an open circuited stub

    • Options
    • A. is more difficult to fabricate and construct
    • B. is made of transmission line of different Z0
    • C. is liable to radiate
    • D. is incapable of giving full range of reactance
      • Discuss
    • 6. As compared to an ordinary semiconductor diode, a Schottky diode

    • Options
    • A. has lower cut in voltage
    • B. has higher cut in voltage
    • C. lower reverse saturation current
    • D. both (b) and (c)
      • Discuss
    • 7. For a superconductor, the relative permeability is

    • Options
    • A. zero
    • B. high
    • C. low
    • D. either low or high
      • Discuss
    • 8. A rectangular wave guide has two stubs each of length connected at the source end. The stubs are circuited. Then the stubs present

    • Options
    • A. an infinite impedance in shunt with line
    • B. an infinite impedance in series with line
    • C. a zero impedance in shunt with line
    • D. a finite impedance in shunt with line
      • Discuss
    • 9. Power monitor and reflectometer use the principle of

    • Options
    • A. directional coupler
    • B. klystron amplifier
    • C. Gunn diode
    • D. TWT
      • Discuss
    • 10. We can know the arrangement of atom in a material by studying electron diffraction pattern.

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

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