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Home ‣ Electronics and Communication Engineering ‣ Electromagnetic Field Theory Comments
  • Question

  • 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

  • Correct Answer
  • A wave motion in forward direction 

    Explanation
    f(x - vot) represents in +ve direction while f(x + vot) represents a progressive wave in -ve direction.

    Electromagnetic Field Theory problems

    Search Results

    • 1. A uniform plane wave is one in which

    • Options
    • A. x = 0
    • B. .
    • C. and are perpendicular
    • D. and lie in a plane
      • Discuss
    • 2. 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
    • 3. 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
    • 4. The radiation resistance of a ?/16 wire dipole in free space will be nearly

    • Options
    • A. 1 ?
    • B. 3 ?
    • C. 13 ?
    • D. 30 ?
      • Discuss
    • 5. 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
    • 6. 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
    • 7. Assertion (A): A TRIAC is a bidirectional SCR.

      Reason (R): A TRIAC is a four layers 3 terminal device and can conduct in both directions.


    • Options
    • A. Both A and R are correct and R is correct explanation of A
    • B. Both A and R 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
    • 8. In the below figure the average load current is 15 A. The rms value of transformer secondary current is

    • Options
    • A. 15 A
    • B. 10.61 A
    • C. 7.5 A
    • D. 14.14 A
      • Discuss
    • 9. In a circuit using a full wave converter (M - 2 connection) the PIV of each thyristor is 400 V. For the same output voltage and fully controlled bridge converter, PIV will be

    • Options
    • A. 400 V
    • B. 800 V
    • C. 200 V
    • D. 2002 V
      • Discuss
    • 10. If Vdc1 is the dc output voltage in half wave controlled rectifier circuit feeding resistive load and Vdc2 is the dc output voltage in full wave controlled rectifier circuit (M - 2 connection) feeding resistive load, then

    • Options
    • A. Vdc1 = 0.5 Vdc2 for all values of firing angle
    • B. Vdc1 = Vdc2 for all values of firing angle
    • C. Vdc1 ? 0.5 Vdc2 for all values of firing angle
    • D. Vdc1 ? 0.5 Vdc2 for all values of firing angle
      • Discuss

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