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  • Question

  • For attenuation of high frequencies we should use


  • Options
  • A. shunt capacitance
  • B. series capacitance
  • C. inductance
  • D. resistance

  • Correct Answer
  • shunt capacitance 

    Explanation
    Since Xc for high frequencies is low, the high frequencies are shunted to ground and are not transmitted.

    Communication Systems problems

    Search Results

    • 1. In standing wave pattern on a transmission line

    • Options
    • A. voltage and current nodes coincide
    • B. voltage and current antinodes coincide
    • C. voltage nodes and current antinodes as well as current nodes and voltage antinodes coincide
    • D. both (a) and (b)
      • Discuss
    • 2. Direct and reflected sound waves may interfere with each other.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. In FM signal with a modulation index mf is passed through a frequency tripler. The wave in the output of the tripler will have a modulation index of

    • Options
    • A. mf
    • B. 3mf
    • C. mf/3
    • D. mf/9
      • Discuss
    • 4. It is desired that transmission line and load should match for a range of frequencies. The best method is

    • Options
    • A. to use a balun
    • B. to use a single stub of adjustable position
    • C. to use a double stub
    • D. to use a broad band amplifier
      • Discuss
    • 5. In the figure , the output y(t) will be

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 6. Which of the following is the indirect way of FM generation?

    • Options
    • A. Reactance bipolar transistor modulator
    • B. Armstrong modulator
    • C. Varactor diode modulator
    • D. Reactance FM modulator
      • Discuss
    • 7. Assertion (A): Free space does not interfere with normal radiation and propagation of radio waves

      Reason (R): Free space has no magnetic or gravitational fields.


    • 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
      • Discuss
    • 8. If the frequency of a wave 20 Hz, the time period is

    • Options
    • A. 20 secs
    • B. 2 secs
    • C. 0.2 secs
    • D. 0.05 secs
      • Discuss
    • 9. Push pull amplifier is

    • Options
    • A. voltage amplifier
    • B. current amplifier
    • C. power amplifier
    • D. none of the above
      • Discuss
    • 10. Radio broadcasts are generally

    • Options
    • A. amplitude modulation
    • B. frequency modulation
    • C. both amplitude and frequency modulation
    • D. neither amplitude nor frequency modulation
      • Discuss

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