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Automatic Control Systems

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

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

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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

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

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Automatic Control Systems
In control systems the output of sensor usually, is

Analog or digital electrical signal
Digital electrical signal
Mechanical signal
Analog electrical signal

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

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

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

Zero
More than 1
less than 1
1

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

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

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