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Microwave Communication problems

  • 1. Which mode has the minimum cutoff frequency in rectangular wave guides?

  • Options
  • A. TE11
  • B. TE10
  • C. TE01
  • D. TE20
    • Discuss
  • 2. The radiation resistance of a doublet antenna of length dl is proportional to

  • Options
  • A. ? l
  • B. (? l)2
  • C. (? l)3
  • D. (? l)05
    • Discuss
  • 3. Assertion (A): A small section of high impedance line is equivalent to a series inductance.

    Reason (R): A small section of a low impedance line is equivalent to a series resistance.


  • Options
  • A. Both A and R are correct and R is correct explanation of A
  • B. Both A and R are correct but R is not correct explanation of A
  • C. A is correct but R is wrong
  • D. A is wrong but R is correct
    • Discuss
  • 4. When duct propagation exists

  • Options
  • A. the line of sight and diffraction. Zone concepts are payable
  • B. the line of sight and diffraction zone concepts are not applicable
  • C. line of sight concept is applicable but diffraction zone concept is applicable
  • D. diffraction zone concept is not applicable but line of sight concept is not applicable
    • Discuss
  • 5. As compared to dimensions of most feeds, the skin depth at microwave frequencies is

  • Options
  • A. of the same magnitude
  • B. much larger
  • C. much smaller
  • D. either (b) or (c)
    • Discuss
  • 6. In which mode of rectangular waveguide are all field components zero?

  • Options
  • A. TM00
  • B. TM11
  • C. TM01
  • D. TM10
    • Discuss
  • 7. A microstrip line has dielectric having relative permittivity ?r. The effective dielectric constant is

  • Options
  • A. more than ?r
  • B. equal to 1
  • C. less than ?r
  • D. either a or b
    • Discuss
  • 8. If in line Electronics and Communication Engineering Microwave Communication: If in line the charact the characteristic impedance becomes real.

  • Options
  • A. True
  • B. False
    • Discuss
  • 9. Consider the following statements about radar Beacon

    1. It is also called transponder.
    2. It includes pulse transmitter, receiver and antenna.
    3. It replies with full power even when the signal receives is weak.
    Which of the above statements are correct?

  • Options
  • A. All
  • B. 1 and 2 only
  • C. 2 and 3 only
  • D. 2 only
    • Discuss
  • 10. For l << ?, the equivalent circuit of a microwave resistor is

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss

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