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ELECTRIC CIRCUITS

Electric Circuits
The time required for a pulse to change from 10 % to 90 % of its maximum value is known as

 decay time.
 fall time.
 run time.
 rise time.

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Electric Circuits
Fall time is the time required for a pulse to decrease from 90 to ________% if its maximum values

 5
 10
 15
 20

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Electric Circuits
An electrical motor has rating of 10 MVA at 0.8 lag, represented as series RL circuit at a 50 MVA base. Find the impedance value?

 (3 + j4) pu
 (4 + j2 ) pu
 (2 + j4) pu
 (4 + j3) pu

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Electric Circuits
When a lossy capacitor with a dielectric of permittivity ε and conductivity σ operates at a frequency ω the loss tangent for the capacitor is given by

 ω σ/ε.
 ω ε/σ.
 σ ω ε.
  σ/ω ε.

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Electric Circuits
An ac voltage source v = vo sinωt is connected across a parallel plate capacitor C. If the conductor current is ic and the displacement current is id, then which is true among following relation

 ic > id.
 ic < id.
 ic + id = 0.
 ic = id.

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