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Automatic Control Systems

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

LED
Either (a) or (b)
LCD
Photodiode

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Automatic Control Systems
Which dc servomotor requires strongest permanent magnet?

Surface wound armature
Slotted armature
Surface wound with stationary rotor
Either A or B

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Automatic Control Systems
M circles are symmetrical with respect to

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

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Automatic Control Systems
A system is highly oscillatory if

Gain margin is high
Gain margin is close to 1 or phase margin is zero
Gain margin is close to 1
Gain margin is high and phase margin is 180°

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Automatic Control Systems
In a simple on-off controller with differential gap, the magnitude of differential gap determines

The life of controller
Neither (a) nor (b)
Both (a) and (b)
The level of accuracy

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

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

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