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Home Electronics and Communication Engineering Electromagnetic Field Theory Comments

  • Question
  • The radiation resistance of a ?/16 wire dipole in free space will be nearly


  • Options
  • A. 1 ?
  • B. 3 ?
  • C. 13 ?
  • D. 30 ?

  • Correct Answer
  • 3 ? 

    Explanation
    Rr = 80p2The radiation resistance of a ?/16 wire dipole in free space will be nearly 1 ? 3 ? 13 ? 30 ? Rr = 8.

    Electromagnetic Field Theory problems


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    • 1. A transmission line is feeding 1 watt of power to a horn antenna having a gain of 10 dB. The antenna is matched to the transmission line. The total power radiated by the horn antenna into the free space is

    • Options
    • A. 10 watts
    • B. 1 watt
    • C. 0.1 watt
    • D. 0.01 watt
    • Discuss
    • 2. Find the radiation resistance of an antenna of length ?/10 meter?

    • Options
    • A. 8 ?
    • B. 780 ?
    • C. 7.8 ?
    • D. 78 ?
    • Discuss
    • 3. Consider a loss less antenna with a directive gain of + 6 dB. If 1 mW of power is fed to it the total power radiated by the antenna will be

    • Options
    • A. 4 mW
    • B. 1 mW
    • C. 7 mW
    • D. 1/4 mW
    • Discuss
    • 4. Most antenna consisting of a 50 meter long vertical conductor operates over a perfectly conducting ground plane. It is base fed at a frequency of 600 kHz. The radiation resistance of the antenna in ohms is

    • Options
    • A.
    • B.
    • C.
    • D. 20p2
    • Discuss
    • 5. Which one of the following potential does not satisfy Laplace's equations?

    • Options
    • A. v = 10 xy
    • B. v = p cos ?
    • C.
    • D. v = f cos ? + 10
    • Discuss
    • 6. In a conductor which of the following relations hold good?

    • Options
    • A. ? x D = r
    • B. ? . D = r
    • C. ? x D = 0
    • D. ? . D = 0
    • Discuss
    • 7. A rectangular waveguide measures 3 x 4.5 cm internally and has a 10 GHz signal propagated in it. Calculate the wave impedance for dominant mode.

    • Options
    • A. 130 p
    • B. 1.3 p
    • C. 120 p
    • D. 12 p
    • Discuss
    • 8. A uniform plane wave is one in which

    • Options
    • A. x = 0
    • B. .
    • C. and are perpendicular
    • D. and lie in a plane
    • Discuss
    • 9. The function f(x - vot) represent which of the following?

    • Options
    • A. A stationary wave
    • B. A wave motion in forward direction
    • C. A wave motion in reverse direction
    • D. None of the above
    • Discuss
    • 10. A single phase half wave rectifier is feeding a resistive load. Input voltage v = Vm sin ?t. The output dc voltage is Vdc and output rms voltage is Vrms . If firing angle is 180°, Vdc and Vrms respectively are

    • Options
    • A. 0 and 0
    • B.
    • C. 0 and - Vm
    • D.
    • Discuss


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