Automatic Control Systems - ECE Questions and Answers

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Lag compensation permits a high gain at low frequencies.

True

False

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The complicated shapes in the polar plots are only due to time constants in the numerator of transfer functions.

True

False

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Which of the following features is not associated with Nichols chart?

(0 dB, -180°) point on Nichols chart represent critical Point (-1, 0)

It is symmetric about -180°

M loci are centred about (0 dB, -180°) point

The frequency at intersection of G(j?) locus and M = +3 dB locus gives bandwidth of closed loop system

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A lag compensator

Speeds up the transient response of the system

Improves steady state behavior of the system

Improves steady state behavior and speeds up the transient response of the system

Improves steady state behavior and preserves the transient response of the system

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A lead compensator

Speeds up the transient response

Increases the stability margin

Increases the stability margin and speeds up the transient-response.

None of the above

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The relative stability of a system is given by

Gain margin alone

Phase margin alone

Both phase and gain margins

Either (a) or (b)

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Transport lag usually exists in

Thermal systems

Hydraulic systems and thermal systems

Pneumatic systems

Thermal, hydraulic and pneumatic systems

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Robotic manipulator arms mostly use

Hydraulic actuator

Pneumatic actuator

Electric motor actuator

None of the above

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Nichol’s chart is symmetric about – 180° axis.

True

False