F3 Vinanti Engineering 21.09.23 D8

Which of the following functions is representing the above wave form graph?

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PGCIL DT Electrical 5 May 2023 Official Paper
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  1. e-at cos wt
  2. eat
  3. e-at sin wt
  4. e-at tn

Answer (Detailed Solution Below)

Option 1 : e-at cos wt
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The correct option is 1

Concept:

  • Damped oscillation: The oscillation of a body whose amplitude goes on decreasing with time is defined as a damped oscillation.
  • Damping coefficient: The measure of the effectiveness of damper, reflects the ability of damper to which it can resist the motion is called the damping coefficient. It is denoted by c.
  • Critical damping: The minimum amount of damping that results in a displaced system returning to its original position without oscillation is called critical damping. It is denoted by cc.
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