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Home Electronics and Communication Engineering Automatic Control Systems See What Others Are Saying!
  • Question
  • When a unit step voltage drives a lag network the output


  • Options
  • A. remains constant at unit step value
  • B. increases exponentially from zero to final value
  • C. decreases exponentially from 1 to 0
  • D. either (b) of (c) depending on values of R and C

  • Correct Answer
  • increases exponentially from zero to final value 

    Explanation
    At t = 0 the capacitor behaves as a short-circuit and output voltage is 0. At t = ? capacitor behaves as an open-circuit and V0 = Vi.

    More questions

    • 1. The characteristic impedance of a cable is about

    • Options
    • A. 300 ?
    • B. 50 ?
    • C. 5 ?
    • D. 2 ?
    • Discuss
    • 2. A copper atom is neutral. Its core has a net charge of

    • Options
    • A. 0
    • B. + 1
    • C. - 1
    • D. + 2
    • Discuss
    • 3. The characteristics of which device has peak point and valley point

    • Options
    • A. SCR
    • B. PUT
    • C. SCS
    • D. Shockley diode
    • Discuss
    • 4. Schrodinger wave equation is partial differential equation.

    • Options
    • A. True
    • B. False
    • Discuss
    • 5. The output frequency of a cycloconverter can be changed by changing the firing angle.

    • Options
    • A. True
    • B. False
    • Discuss
    • 6. Most of the memory chips in static RAM

    • Options
    • A. do not require any supply
    • B. need 2 V supply
    • C. need 5 V supply
    • D. need 12 V supply
    • Discuss
    • 7. In crystalline solids, atoms are stacked in a regular manner.

    • Options
    • A. True
    • B. False
    • Discuss
    • 8. The classes of solid dielectrics are

    • Options
    • A. A, B, C, D, E, F, H
    • B. A E B F H C D
    • C. Y A E B F H C
    • D. A E B F H C
    • Discuss
    • 9. The unit for mmf is

    • Options
    • A. A
    • B. Wb
    • C. T
    • D. V
    • Discuss
    • 10. In a single phase full wave regulator, the firing angles in the positive and negative half cycles are generally

    • Options
    • A. equal
    • B. different
    • C. equal or different
    • D. different but sometimes equal
    • Discuss


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