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Home Electronics and Communication Engineering Analog Electronics See What Others Are Saying!
  • Question
  • A bridge rectifier circuit has input of 50 Hz frequency. The load resistance is RL and filter capacitance is C. For good output wave shape, the time constant RLC should be at least equal to


  • Options
  • A. 10 ms
  • B. 20 ms
  • C. 50 ms
  • D. 100 ms

  • Correct Answer
  • 100 ms 

    Explanation
    Time constant RLC must be about 5 x 20 ms.

    More questions

    • 1. IC (instruction cycle), FC (fetch cycle) and EC (executive cycle) are related as

    • Options
    • A. IC = FC - EC
    • B. IC = FC + EC
    • C. IC = FC + 2EC
    • D. EC = IC + EC
    • Discuss
    • 2. A microstrip line has dielectric having relative permittivity ?r. The effective dielectric constant is

    • Options
    • A. more than ?r
    • B. equal to 1
    • C. less than ?r
    • D. either a or b
    • Discuss
    • 3. An energy signal has G(f) = 10. Its energy density spectrum is

    • Options
    • A. 10
    • B. 100
    • C. 50
    • D. 20
    • Discuss
    • 4. At room temperature the current in an intrinsic semiconductor is due to

    • Options
    • A. holes
    • B. electrons
    • C. ions
    • D. holes and electrons
    • Discuss
    • 5. In a multicavity klystron amplifier the signal to be amplified develops an ac voltage of signal frequency across the gap in buncher cavity

    • Options
    • A. True
    • B. False
    • Discuss
    • 6. Consider the following

      1. The first letter of a Java variable is lower case.
      2. Each successive word in Java variable begins with a capital letter.
      3. All other letters are lower case.
      4. A Java variable can have a digit as first character.
      Which of the above are correct?

    • Options
    • A. All
    • B. 1, 2, 3 only
    • C. 1, 2, 4 only
    • D. 2, 3, 4 only
    • Discuss
    • 7. The antenna current of an AM transmitter is 8 A, when only the carrier is sent, but it increases to 8.93 A when the carrier is modulated by a single sine wave. Determine the antenna current when the percent of modulation changes to 0.8

    • Options
    • A. 9.19 A
    • B. 9.91 A
    • C. 10.56 A
    • D. 8.61 A
    • Discuss
    • 8. A full wave rectifier type meter is used to measure the wave shape shown in figure. The voltmeter is calibrated to read rms value of sine wave. The reading of voltmeter will be

    • Options
    • A.
    • B.
    • C. 100 V
    • D. 111 V
    • Discuss
    • 9. AB + AB =

    • Options
    • A. B
    • B. A
    • C. 1
    • D. 0
    • Discuss
    • 10. Work function of oxide coated cathode is much lower than that of tungsten cathode.

    • Options
    • A. True
    • B. False
    • Discuss


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