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Automatic Control Systems

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

Either (a) or (b)
Photodiode
LED
LCD

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

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

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Automatic Control Systems
Integral control action

Both (a) and (b)
Removes offset
Neither (a) nor (b)
May lead to oscillatory response

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

less than 1
Zero
More than 1
1

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Automatic Control Systems
Nichols chart consists of

Constant phase angle loci
Constant magnitude loci
Magnitude and phase angle loci in log-magnitude versus phase diagram
None of these

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Automatic Control Systems
M circles are symmetrical with respect to

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

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