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  • Question

  • Consider the amplitude modulated (AM) signal Ac cos ?ct + 2 cos ?mt cos ?ct For demodulating the signal using envelope detector, the minimum value of Ac should be


  • Options
  • A. 2
  • B. 1
  • C. 0.5
  • D. 0

  • Correct Answer
  • 2 

    Explanation
    AC cos ?ct + 2 cos ?mt cos ?ct

    AC cos?ctConsider the amplitude modulated (AM) signal Ac cos ?ct + 2 cos ?mt cos ?ct For demodulating the sig

    for envelope detection ? < 1 ? Consider the amplitude modulated (AM) signal Ac cos ?ct + 2 cos ?mt cos ?ct For demodulating the sig < 1 ? Ac should be at least-2.

    More questions

    • 1. If f(t) = A d(t - a), F(s) is

    • Options
    • A. A e-as
    • B. A eas
    • C. A a e-as
    • D. Aa eas
      • Discuss
    • 2. A vacuum parallel plate capacitor is charged. The field between the plates is 2 x 104 V/m. If the space between the plates is filled with a material having ?r = 10, then the value of field in the dielectric will be

    • Options
    • A. 2 x 103 V/m
    • B. x 104 V/m
    • C. 210 x 104 V/m
    • D. 2 x 105 V/m
      • Discuss
    • 3. Match the following:

      List I List II
      A. ? x = 0 1. irrotational vector
      B. ? . = 0 2. conservative field
      C. ? .dl = 0 3. solenoidal vector


    • Options
    • A. A-3, B-1, C-2
    • B. A-1, B-2, C-3
    • C. A-2, B-3, C-1
    • D. A-3, B-2, C-1
      • Discuss
    • 4. Assertion (A): A fully controlled bridge converter can operate in first and fourth quadrant.

      Reason (R): A semi converter is cheaper than a full converter.


    • Options
    • A. Both A and R are correct and R is correct explanation of A
    • B. Both A and R 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
    • 5. Match the following:

      List I List II
      A. 1. v(t) = u(t + 1)
      B. 2. v(t) = u(t) - 2u(t - 1) + 2u(t - 2) - 2u(t - 3)....
      C. 3. v(t) = u(t - 1) - u(t - 3)
      D. 4. v(t) = ?(t - 1)


    • Options
    • A. A-3, B-4, C-2, D-1
    • B. A-3, B-4, C-1, D-2
    • C. A-4, B-3, C-2, D-1
    • D. A-4, B-3, C-1, D-2
      • Discuss
    • 6. Match the following:

      List I List II
      A. True type 1. Type of calculator in window
      B. FIND 2. Window command
      C. WORD PAD 3. Name of a Font
      D. STANDARD 4. Has many features of a simple word processor


    • Options
    • A. A-1, B-2, C-3, D-4
    • B. A-4, B-3, C-2, D-1
    • C. A-3, B-2, C-1, D-4
    • D. A-3, B-2, C-4, D-1
      • Discuss
    • 7. Transistor are free from which type of noise?

    • Options
    • A. Resistance noise
    • B. Partition noise
    • C. Flicker noise
    • D. Shot noise
      • Discuss
    • 8. A dc separately excited motor has constant field current. The armature is fed from a single phase supply through a full converter. When a = 0, speed is 500 rpm. If a = 45°, the speed is likely to be

    • Options
    • A. about 350 rpm
    • B. about 250 rpm
    • C. about 175 rpm
    • D. about 125 rpm
      • Discuss
    • 9. Which of the following pairs are correctly matched?

      1. Brune's realisation : realisation with ideal transformer.
      2. Cauer realisation : ladder realisation.
      3. Bott Duffin realisation : with non ideal transformer.
      Select the answer using the following codes:

    • Options
    • A. 1, 2 and 3
    • B. 2 and 3
    • C. 1 and 3
    • D. 1 and 2
      • Discuss
    • 10. In controlled heating circuits, thyristors act as

    • Options
    • A. rectifier
    • B. inverter
    • C. ac regulator
    • D. chopper
      • Discuss

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