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Home ‣ Electronics and Communication Engineering ‣ Microwave Communication See What Others Are Saying!
  • Question

  • Which of the following statements is not correct regarding modes of electromagnetic energy transmission?


  • Options
  • A. In TE mode the direction of electric field is always and everywhere transverse to the direction of propagation
  • B. In TM mode the magnetic field pattern is always and everywhere transverse to the direction of propagation
  • C. The subscripts is TE and TM designations denote the number of half sine wave variations of the field components in x and y directions respectively.
  • D. TM11 is called the dominant mode.

  • Correct Answer
  • TM11 is called the dominant mode. 

    • More questions

    • 1. Suppose that the modulating signal is m(t) = 2cos (2pfmt) and the carrier signal is xC(t) = AC cos(2pfct), which one of the following is a conventional AM signal without over modulation?

    • Options
    • A. x(t) = Acm(t)cos(2pfct)
    • B. x(t) = Ac [1 + m(t)]cos (2pfct)
    • C.
    • D. x(t) = Accos(2pfmt)cos(2pfct) + Acsin(2pfmt)sin(2pfct)
      • Discuss
    • 2. The electric field on the surface of a perfect conductor is 2V/m. The conductor is immersed in water with ? = 80 ?0. The surface charge density on the conductor is ((?0 = 10-9/36p)F/m)

    • Options
    • A. 0 c/m2
    • B. 2 c/m2
    • C. 1.8 x 10-11 c/m2
    • D. 1.14 x 10-9 c/m2
      • Discuss
    • 3. In the given figure a short circuited transmission line resonator If n = 1, 2, 3...

    • Options
    • A. For series reasonance ?l = np and for parallel resonance
    • B. For series resonance and for parallel resonance ?l = np
    • C. ?l = np for both series and parallel resonance
    • D. for both series and parallel resonance
      • Discuss
    • 4. For the gate in the given figure the output will be

    • Options
    • A. 0 
    • B. 1
    • C. A
    • D. A
      • Discuss
    • 5. If 'a' is the width of rectangular wave guide and '?' is the wave length, then

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 6. The resolution of an n bit DAC with a maximum input of 5 V is 5 mV. The value of n is

    • Options
    • A. 8
    • B. 9
    • C. 10
    • D. 11
      • Discuss
    • 7. An SCR is triggered at 80° in the positive half cycle, only. The rms anode current is 25 A. If the firing angle is changed to 160°, the rms current is likely to be

    • Options
    • A. 25 A
    • B. 12.5 A
    • C. less than 25 A
    • D. less than 12.5 A
      • Discuss
    • 8. The fixed count that should be used so that the output register will represent the input for a 6 bit dual slope A/D converter uses a reference of -6v and a 1 MHz clock. It uses a fixed count of 40 (101000).

    • Options
    • A. 000110
    • B. 0010
    • C. 1111
    • D. 011101
      • Discuss
    • 9. Which of the following is taken as reference antenna for directive gain?

    • Options
    • A. Half wave dipole
    • B. Elementary doublet
    • C. Isotropic
    • D. Infinitesimal dipole
      • Discuss
    • 10. India's first three-axis stabilised geostationary communication satellite is

    • Options
    • A. Rohini
    • B. Aryabhatta
    • C. Apple
    • D. Bhaskara
      • Discuss

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