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  • Question

  • 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

  • Correct Answer
  • Both A and R are correct and R is correct explanation of A 

    Explanation
    Since free space does not have magnetic and other fields, waves can propagate without any interference.

    Communication Systems problems

    Search Results

    • 1. 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
    • 2. For attenuation of high frequencies we should use

    • Options
    • A. shunt capacitance
    • B. series capacitance
    • C. inductance
    • D. resistance
      • Discuss
    • 3. 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
    • 4. Direct and reflected sound waves may interfere with each other.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. 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
    • 6. 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
    • 7. Push pull amplifier is

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

    • Options
    • A. amplitude modulation
    • B. frequency modulation
    • C. both amplitude and frequency modulation
    • D. neither amplitude nor frequency modulation
      • Discuss
    • 9. Non-coherently detection is not possible for

    • Options
    • A. PSK
    • B. ASK
    • C. FSK
    • D. both (a) and (c)
      • Discuss
    • 10. Energy content of atmospheric noise

    • Options
    • A. does not depend on frequency
    • B. decreases as frequency is increased
    • C. increases as frequency is increased
    • D. either (a) or (c) depending on the temperature
      • Discuss

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