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Automatic Control Systems

Automatic Control Systems
In force current analogue, mechanical mobility is analogous to

Impedance Z
Admittance Y
Reactance X
Conductance G

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Automatic Control Systems
Magnetic amplifier is used for

Frequency amplification
Power amplification
Current amplification
Voltage amplification

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

more than 1
less than 1
zero
1

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Automatic Control Systems
Nichols chart consists of

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

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Automatic Control Systems
The poles with greater displacement from the real axis correspond to

Unbounded output
Higher frequencies of oscillations
Stable response
Lower frequencies of oscillations

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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 close to 1 or phase margin is zero
Gain margin is high
Gain margin is close to 1

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