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

  • Assertion (A): The condition of minimum distortion in a transmission line is L = RC/G.

    Reason (R): Line loading means addition of inductance to satisfy the condition L = RC/G.


  • Options
  • A. Both A and R are correct and R is correct explanation of A
  • B. Both A and R are 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

  • Correct Answer
  • Both A and R are correct but R is not correct explanation of A 

    Explanation
    Oscillator circuits using vacuum tubes (triodes, pentodes) have the following limitations at very high frequencies (microwave region).

    The stray capacitances and inductances become important and affect the operation of the circuit.

    At low frequencies the transit time between cathode and anode is a small fraction of period of oscillation.

    However, at microwave frequencies this transit time becomes comparable to time period of oscillations.

    More questions

    • 1. Bellows converts

    • Options
    • A. pressure difference into displacement
    • B. pressure difference into voltage
    • C. displacement into pressure difference
    • D. either (a) or (c)
      • Discuss
    • 2. The noise figure of multicavity klystron amplifier is very low

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. Let JCOKE = 98 and LPEPSI = 42 Consider the statement

      IF (JCOKE - 3 * LPEPSI) 5, 6, 7
      5 JCOKE = JCOKE + 5
      6 JCOKE = JCOKE + 8
      7 JCOKE = JCOKE + 11

      The value of JCOKE after the execution of above statement will be

    • Options
    • A. 103
    • B. 106
    • C. 109
    • D. none of the above
      • Discuss
    • 4. Read the following statements about files in Pascal

      1. A file is a data structure which consists of a sequence of components of the same type.
      2. The number of components in a file is variable.
      3. The components in a file can be accessed only sequentially starting from the beginning of the file.
      Which of the above are correct?

    • Options
    • A. All
    • B. 1 and 2 only
    • C. 2 and 3 only
    • D. 1 and 3 only
      • Discuss
    • 5. In a backward wave oscillator the wave travelling along the line winds itself back and forth

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. In the series circuit shown in figure, for series resonance, the value of the coupling coefficient, K will be

    • Options
    • A. 0.25
    • B. 0.5
    • C. 0.1
    • D. 1
      • Discuss
    • 7. Match the following:

      List I List II
      A. hie 1. siemens
      B. hoe 2. no units
      C. hfe 3. ohms


    • Options
    • A. A-1, B-2, C-3
    • B. A-3, B-1, C-2
    • C. A-2, B-1, C-3
    • D. A-3, B-2, C-1
      • Discuss
    • 8. The number of leads in a power semiconductor diode are

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 2 or 3
      • Discuss
    • 9. As compared to their values in free space

    • Options
    • A. velocity of electric wave in dielectric is smaller but wave length of electric wave is more
    • B. both velocity and wave length of electric wave in dielectric are higher
    • C. both velocity and wave length of electric wave in dielectric are smaller
    • D. wave length of electric wave is less but velocity is more in dielectric
      • Discuss
    • 10. Match the following:

      List I List II
      A. 1. a constant
      B. e-j? 2. exponential function
      C. 3. t multiplied exponential function
      D. k ?(?) 4. rectangular pulse
      5. impulse function


    • Options
    • A. A-4, B-5, C-3, D-1
    • B. A-4, B-5, C-3, D-2
    • C. A-3, B-4, C-2, D-1
    • D. A-3, B-4, C-2, D-5
      • Discuss

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