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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
Rotor
Stator
Either (a) or (b)

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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.

False
True

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Automatic Control Systems
The sensor generally used in incremental optical encoder is

Either (a) or (b)
LCD
Photodiode
LED

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Automatic Control Systems
DC tachogenerator can be used in

Position control system
Neither A nor B
Both A and B
Speed control system

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Automatic Control Systems
M circles are symmetrical with respect to

M = 1 straight line and real axis
M = 1 straight line
Real and imaginary axis
M = 1 straight line and imaginary axis

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

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

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