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  • Question

  • A rectangular waveguide has width a. Then at the cutoff frequency (with corresponding wave length ?c)


  • Options
  • A. A rectangular waveguide has width a. Then at the cutoff frequency (with corresponding wave length ?c
  • B. a = ?c
  • C. A rectangular waveguide has width a. Then at the cutoff frequency (with corresponding wave length ?c
  • D. a = 2?c

  • Correct Answer
  •  

    • More questions

    • 1. The transition of electron from energy level W1 to W2 is associated with emission or absorption of electro magnetic radiation of frequency f such that

    • Options
    • A. hf = |W1 - W2|
    • B. |W1 - W2|f = h
    • C. hf = 0.5|W1 - W2|
    • D. (hf)2 = |W1 - W2|
      • Discuss
    • 2. In a rare gas, the molecules of some atoms have an excess positive or negative charge. The electric field tends to shift positive ions relative to negative ions. This is known as ionic polarization.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. If QL is loaded Q, QE is external Q and QU is unloaded Q of a microwave resonator, then

    • Options
    • A.
    • B.
    • C.
    • D. QL = QE + QU
      • Discuss
    • 4. Which of these commutation methods uses an external pulse for commutation?

    • Options
    • A. Class A
    • B. Class C
    • C. Class E
    • D. Class F
      • Discuss
    • 5. A telephone user while talking to a person via a satellite has to wait for reply for about __________ millisecond.

    • Options
    • A. 100
    • B. 270
    • C. 470
    • D. 540
      • Discuss
    • 6. In a radio receiver, if the intermediate frequency is too high

    • Options
    • A. Selectivity will be poor
    • B. Tracking difficulties will be least
    • C. Adjacent channel rejection will improve
    • D. All of the above will occur
      • Discuss
    • 7. The degree of the nodes 1, 2, 3, 4 is

    • Options
    • A. 2
    • B. 3
    • C. 2 for 1, 2, 3, and 3 for 4
    • D. all 3
      • Discuss
    • 8. The input impedance of op-amp circuit of figure is

    • Options
    • A. 120 k ohm
    • B. 110 k ohm
    • C. infinity
    • D. 10 k ohm
      • Discuss
    • 9. The most effective anti jamming technique is

    • Options
    • A. frequency hopping
    • B. spread-spectrum modulation
    • C. key leverage
    • D. once-only key
      • Discuss
    • 10. Statement 1
      Diode is the most common device used for demodulation.
      Statement 2
      A discriminator is a FM detector.

    • Options
    • A. Statement 1 is true but statement 2 is false
    • B. Statement 1 is false but statement 2 is true
    • C. Both the statements are true
    • D. Both the statements are false
      • Discuss

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