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Automatic Control Systems

Automatic Control Systems
Magnetic amplifier is used for

Frequency amplification
Current amplification
Voltage amplification
Power amplification

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Automatic Control Systems
Nichols chart consists of

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

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Automatic Control Systems
Which of the following is used to obtain output position in a position control system?

Synchro
Load cell
Thermistor
Strain gauge

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Automatic Control Systems
A system is highly oscillatory if

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

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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.

True
False

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Automatic Control Systems
Which control action can never be used alone?

Both (b) and (c)
Proportional
Derivative
Integral

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