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  • Question
  • The reverse voltage applied to a varactor diode


  • Options
  • A. is less than avalanche breakdown voltage
  • B. is more than avalanche breakdown voltage
  • C. may be more or less than a avalanche breakdown voltage
  • D. is very high as compared to avalanche breakdown voltage

  • Correct Answer
  • is less than avalanche breakdown voltage 

    Explanation
    The action of varactor diode is due to the capacitance of depletion layer. The thickness of depletion layer depends on the reverse bias which should not cause breakdown.

    Microwave Communication problems


    Search Results


    • 1. At frequencies of 10 MHz and higher the impedance represented by ground is primarity

    • Options
    • A. resistive
    • B. inductive
    • C. capacitive
    • D. partly resistive and partly capacitive
    • Discuss
    • 2. When resonant cavities are coupled together the result is

    • Options
    • A. one resonant frequency
    • B. n resonant frequencies
    • C. resonant frequencies
    • D. either (b) or (c)
    • Discuss
    • 3. The path length between ports 1 and 2 for the two waves in a hybrid ring is

    • Options
    • A. 1
    • B.
    • C.
    • D.
    • Discuss
    • 4. As wavelength decrease the size of high directivity antenna

    • Options
    • A. decreases
    • B. increases
    • C. is not affected
    • D. either (b) or (c)
    • Discuss
    • 5. In the given figure forward voltage wave has a magnitude

    • Options
    • A. 90 V
    • B. 60 V
    • C. 30 V
    • D. 10 V
    • Discuss
    • 6. The skin depth at 1000 MHz as compared to that at 500 MHz is

    • Options
    • A. 2
    • B. 12
    • C. 0.707
    • D. 0.5
    • Discuss
    • 7. In a TWT the amplitude of resultant wave travelling down the helix remains constant

    • Options
    • A. True
    • B. False
    • Discuss
    • 8. Which of the following modes of transmission will not be supported by a rectangular waveguide?

    • Options
    • A. TE15
    • B. TE12
    • C. TM11
    • D. TM10
    • Discuss
    • 9. If 'a' is the width of rectangular wave guide and '?' is the wave length, then

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 10. Which one of the following can be used for amplification of microwave energy?

    • Options
    • A. TWT
    • B. Magnetron
    • C. Reflex klystron
    • D. Gunn diode
    • Discuss


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