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  • Question

  • A 1000 kHz carrier is simultaneously modulated with 300 Hz, 800 Hz and 2 kHz audio sine waves. Which of the following frequency is least likely to be present in the output?


  • Options
  • A. 1002 kHz
  • B. 1000 kHz
  • C. 999.2 kHz
  • D. 998.0 kHz

  • Correct Answer
  • 1000 kHz 

    Explanation
    Frequency present in the sidebands is equal to = fc ± fm, fc ± 2fm , fc ± 3fm .

    More questions

    • 1. In elemental dielectrics, the orientation and ionic polarization are absent.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. Which of the following should be used in order to prevent overloading or the last IF amplifier in a receiver?

    • Options
    • A. Variable selectivity
    • B. Variable sensitivity
    • C. Double conversion
    • D. Squelch
      • Discuss
    • 3. The waveshape of output voltage of half bridge inverter is

    • Options
    • A. sinusoidal
    • B. square
    • C. triangular
    • D. either (a) or (b)
      • Discuss
    • 4. The main utility of SCR is due to

    • Options
    • A. gate triggering
    • B. high temperature triggering
    • C. triggering
    • D. high breakdown voltage
      • Discuss
    • 5. What is the characteristic impedance at 10 MHz?

    • Options
    • A. 547.7 ?
    • B. 54.7 ?
    • C. 5.47 ?
    • D. .547 ?
      • Discuss
    • 6. In a microwave resistor the wall thickness is made as small as possible to

    • Options
    • A. have high value of R
    • B. have low value of R
    • C. minimize capacitive effect
    • D. reduce inductance
      • Discuss
    • 7. Microwaves are used for

    • Options
    • A. telephony
    • B. radio broadcast
    • C. TV systems
    • D. all of the above
      • Discuss
    • 8. The power dissipation in a transistor is the product of

    • Options
    • A. emitter current and emitter to base voltage
    • B. emitter current and collector to emitter voltage
    • C. collector current and collector to emitter voltage
    • D. none of the above
      • Discuss
    • 9. Match the following:

      List I (F.T and F.S) List II (Properties)
      A. Fourier Series 1. Discrete, Periodic
      B. Fourier Transform 2. Continuous, Periodic
      C. Discrete Time Fourier 3. Discrete aperiodic
      D. Discrete Fourier Transform 4. Continuous, aperiodic


    • Options
    • A. A-3, B-4, C-2, D-1
    • B. A-1, B-2, C-4, D-3
    • C. A-3, B-2, C-4, D-1
    • D. A-1, B-4, C-2, D-3
      • Discuss
    • 10. Consider the following statements

      1. An iron cored choke is non linear and passive device.
      2. A carbon resistor kept in sunlight is a time invariant and passive device.
      3. A dry cell is a time varying and active device.
      4. An air capacitor is time invariant and passive device.
      Of these statements

    • Options
    • A. 1, 2, 3 and 4 are correct
    • B. 1, 2, 3 are correct
    • C. 1, 2, 4 are correct
    • D. 2 and 4 are correct
      • Discuss

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