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Automatic Control Systems

Automatic Control Systems
In force current analogy, displacement x is analogous to

Electrostatic energy
Magnetic flux linkage
Voltage
Charge

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Automatic Control Systems
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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Automatic Control Systems
The relative stability of a system is given by

Phase margin alone
Gain margin alone
Both phase and gain margins
Either (a) or (b)

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

False
True

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Automatic Control Systems
The poles with greater displacement from the real axis correspond to

Higher frequencies of oscillations
Stable response
Unbounded output
Lower frequencies of oscillations

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Automatic Control Systems
For any transfer function, the constant phase angle loci are

Either (a) or (b)
Neither (a) nor (b)
A family of circles
A family of straight lines

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