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Home Electronics and Communication Engineering Microwave Communication See What Others Are Saying!
  • Question
  • Out of modes TE20 and TE30 of propagation of electromagnetic engery


  • Options
  • A. both have the same cutoff frequency
  • B. TE20 has lower cut off frequency as compared to TE30
  • C. TE30 has lower cutoff frequency as compared to TE20
  • D. either (a) or (c)

  • Correct Answer
  • TE20 has lower cut off frequency as compared to TE30 


  • More questions

    • 1. In a two phase ac servomotor rotor resistance is R and rotor reactance is X. The speed curve will be linear if

    • Options
    • A.
    • B.
    • C.
    • D. X2 = R
    • Discuss
    • 2. A uniform plane wave is one in which

    • Options
    • A. x = 0
    • B. .
    • C. and are perpendicular
    • D. and lie in a plane
    • Discuss
    • 3. Regarding TASI which one of the following statements is wrong?

    • Options
    • A. It snatches the channel in his speech and may allocate it to another speaker needing it.
    • B. The same speaker is reassigned a channel almost instantly when he speaks again even when the circuit is heavily loaded.
    • C. It increases the overall utilization of the transmission channel
    • D. Intercontinental callers sometimes confuse the effects of TASI with the effects of satellite delay.
    • Discuss
    • 4. In a single phase full wave converter (M - 2 connection) feeding a highly inductive load, the firing angle for each thyristor is a in the respective half cycle. The period of conduction of each thyristor is

    • Options
    • A. p - a
    • B. p
    • C. p + a
    • D. p - 2a
    • Discuss
    • 5. Consider the systems with following open loop transfer functions

      If unity feedback is used, the increasing order of time taken for unit step response to settle is

    • Options
    • A. 1, 2, 3
    • B. 3, 1, 2
    • C. 2, 3, 1
    • D. 3, 2, 1
    • Discuss
    • 6. A satellite link uses different frequencies for receiving and transmitting in order to

    • Options
    • A. avoid interference from terrestrial microwave links
    • B. avoid interference between its powerful transmitted signal and weak in coming signal
    • C. minimise free-space losses
    • D. maximise antenna gain
    • Discuss
    • 7. A thyristor has a turn on time of 6 ?s. If the anode circuit is inductive, the turn on time will be

    • Options
    • A. 6 ?s
    • B. less than 6?s
    • C. more than 6 ?s
    • D. either 6 ?s or less
    • Discuss
    • 8. In a ballistic galvanometer, a charge of 100 ?C gives a first swing of 25°. The charge required to cause first swing of 50° is

    • Options
    • A. 200 ?C
    • B. 400 ?C
    • C. 50 ?C
    • D. 25 ?C
    • Discuss
    • 9. If reference sound pressure P0 is 2 x 10-5 N/m2, a sound pressure of 90 dB is equal to

    • Options
    • A. 0.632 N/m2
    • B. 0.707 N/m2
    • C. 0.835 N/m2
    • D. 0.925 N/m2
    • Discuss
    • 10. The conductivity of intrinsic semiconductor is given by

    • Options
    • A. eni(?p - ?n)
    • B. eni(?p + ?n)
    • C. ni(?p + ?n)
    • D. ni(?p?n)
    • Discuss


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