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Automatic Control Systems

Automatic Control Systems
The permanent magnet field system of brushless dc servo- motor is generally on

Partly on stator and partly on rotor
Stator
Either (a) or (b)
Rotor

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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.

False
True

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

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

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Automatic Control Systems
The addition of a pole to the open loop transfer function pulls the root locus

None of these
To the left and making the system more stable
Towards right or left depending on the position of new pole
To the right

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Automatic Control Systems
Which of the following is used to obtain output position in a position control system?

Thermistor
Load cell
Strain gauge
Synchro

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Automatic Control Systems
The distance of poles from origin depends on

Uqndamped natural frequency
Both A and B
Neither A nor B
Damping ratio

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