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  • Question

  • In TE and TM modes of rectangular waveguides having propagation in z direction


  • Options
  • A. Ez and Hz are both zero
  • B. In TE mode Ez is zero and in TM mode Hz is zero
  • C. In TE mode Hz is zero and in TM mode Ez is zero
  • D. In both TE and TM modes both Ez and Hz are non-zero

  • Correct Answer
  • In TE mode Ez is zero and in TM mode Hz is zero 

    • More questions

    • 1. The dipole moment per unit volume P as a function of E for an insulator is

    • Options
    • A. P = ?0 E(?r)
    • B. P = ?0 E
    • C. P = ?0(?r - 1) E
    • D. P =
      • Discuss
    • 2. When a trivalent impurity is added, the semiconductor becomes

    • Options
    • A. p type
    • B. n type
    • C. intrinsic
    • D. neutral
      • Discuss
    • 3. Which of these has the highest dielectric strength?

    • Options
    • A. Mica
    • B. Air
    • C. Cotton
    • D. Rubber
      • Discuss
    • 4. Consider the probability density f(x) = ae-b|x| where x is a random variable whose allowable values range from x = - ? to x = + ?. P(1 ? x ? 2)

    • Options
    • A.
    • B.
    • C.
    • D. (e-b - e-2b)
      • Discuss
    • 5. Which of these devices is used in relaxation oscillator?

    • Options
    • A. UJT
    • B. SCR
    • C. DIAC
    • D. TRIAC
      • Discuss
    • 6. The number of turns in a coil is doubled. If initial time constant is T, the new time constant is

    • Options
    • A. T
    • B. 2T
    • C. 4T
    • D.
      • Discuss
    • 7. A PIN diode can be used

    • Options
    • A. as a shunt mounted switch
    • B. as a series mounted switch
    • C. both as series or shunt mounted switch
    • D. non of the above
      • Discuss
    • 8. Which converter is used in HVDC transmission?

    • Options
    • A. 3 pulse
    • B. 6 pulse
    • C. 12 pulse
    • D. 24 pulse
      • Discuss
    • 9. Two coaxial metallic cylinders have radii R1 and R2. The space between them is filled with a dielectric having dielectric constant ?r. The capacitance per metre length is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 10. In envelope detection of an AM waveform

    • Options
    • A. One side band and full-ampiitude carrier are needed
    • B. Both side bands and full-amplitude carrier are needed
    • C. Only two side bands are needed
    • D. Upper side band and part of carrier are needed
      • Discuss

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