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Automatic Control Systems

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

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

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Automatic Control Systems
Magnetic amplifier is used for

Power amplification
Frequency amplification
Voltage amplification
Current amplification

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Automatic Control Systems
If the poles lie in second quadrant, damping ratio is

zero
1
less than 1
more than 1

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Automatic Control Systems
In root locus analysis the breakaway and break in points

Always occur in complex conjugate pairs
None of these
Either lie on the real axis or occur in complex conjugate pairs
lie on the real axis

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Automatic Control Systems
In the field controlled motor the entire damping comes from

Armature resistance
Back emf
Field resistance
Motor friction and load

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

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

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