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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. Schrodinger wave equation is partial differential equation.

    • Options
    • A. True
    • B. False
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    • 2. The output frequency of a cycloconverter can be changed by changing the firing angle.

    • Options
    • A. True
    • B. False
    • Discuss
    • 3. Most of the memory chips in static RAM

    • Options
    • A. do not require any supply
    • B. need 2 V supply
    • C. need 5 V supply
    • D. need 12 V supply
    • Discuss
    • 4. In crystalline solids, atoms are stacked in a regular manner.

    • Options
    • A. True
    • B. False
    • Discuss
    • 5. The classes of solid dielectrics are

    • Options
    • A. A, B, C, D, E, F, H
    • B. A E B F H C D
    • C. Y A E B F H C
    • D. A E B F H C
    • Discuss
    • 6. The unit for mmf is

    • Options
    • A. A
    • B. Wb
    • C. T
    • D. V
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    • 7. In a single phase full wave regulator, the firing angles in the positive and negative half cycles are generally

    • Options
    • A. equal
    • B. different
    • C. equal or different
    • D. different but sometimes equal
    • Discuss
    • 8. The real part of complex dielectric constant and tan? for a dielectric are 2.1 and 5 x 10-4 at 100 Hz respectively. The imaginary part of dielectric constant at 100 Hz is

    • Options
    • A. 1.05 x 10-3
    • B. 2.1 x 10-3
    • C. 5 x 10-3
    • D. 1.05 x 10-2
    • Discuss
    • 9. The units for ?r are

    • Options
    • A. Farads
    • B. Farads/m
    • C.
    • D. no units
    • Discuss
    • 10. Tesla is a unit of

    • Options
    • A. flux
    • B. field strength
    • C. flux density
    • D. MMF
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