The impulse response of an RL circuit is: - Automatic Control Systems

Electronics and Communication Engineering (ECE) : Automatic Control Systems - Quiz(MCQ)

The impulse response of an RL circuit is:

A)

Step function

B)

Parabolic function

C)

Decaying exponential function

D)

Rising exponential function

Correct Answer : Option (C) : Decaying exponential function

Explanation : The RL circuit comprises of the resistor and inductor connected in series.

The equation can be written as:

1 = RI(s) + sLI(s)

1 = I(s) [R + sL]

I(s) = 1 / (R +sL)

Taking the inverse Laplace, we get:

The equation clearly depicts that the impulse response is a decaying exponential function.

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For a quadratic factor in denominator of transfer function the phase angle at corner frequency (in Bode phase angle plot)

A)

is +90Â°

B)

is -90Â°

C)

depends on the damping factor

D)

None of the above

Correct Answer : is -90Â°

The response to sinusoidal excitation can be found by

A)

setting s = jÏ‰ in the network function

B)

setting s = -jÏ‰ in the network function

C)

taking inverse transform of network function

D)

None of the above

Correct Answer : setting s = jÏ‰ in the network function

The resolution of a wire wound potentiometer is about

A)

5%

B)

1%

C)

0.1%

D)

0.001%

Correct Answer : 0.1%

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