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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
The sensor generally used in incremental optical encoder is

LCD
Either (a) or (b)
LED
Photodiode

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

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Automatic Control Systems
Magnetic amplifier is used for

Voltage amplification
Frequency amplification
Current amplification
Power amplification

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Automatic Control Systems
The effect of adding poles and zeros can be determined quickly by

Nichols chart
Root locus
Nyquist plot
Bode plot

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

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