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Automatic Control Systems

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

Charge
Electrostatic energy
Magnetic flux linkage
Voltage

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

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

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Automatic Control Systems
For a stable system having two or more gain crossover frequencies the phase margin is measured at the highest crossover frequency.

True
False

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Automatic Control Systems
For type 1 system the velocity lag error is

Inversely proportional to gain constant
Independent of gain constant
Inversely proportional to bandwidth of system
Directly proportional to gain constant

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Automatic Control Systems
A conditionally stable system is stable for the value of gain between two critical values. It is unstable if

Both A and B
None of these
The gain is decreased below lower critical value
The gain is increased beyond upper critical value

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

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

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