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Automatic Control Systems

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

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

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Automatic Control Systems
For type 1 system the velocity lag error is

Independent of gain constant
Directly proportional to gain constant
Inversely proportional to bandwidth of system
Inversely proportional to gain constant

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

Reactance X
Impedance Z
Conductance G
Admittance Y

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Automatic Control Systems
For a stable system having two or more gain crossover frequencies the phase margin is measured at the highest crossover frequency.

False
True

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Automatic Control Systems
In force current analogy, displacement x is analogous to

Magnetic flux linkage
Voltage
Charge
Electrostatic energy

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

Bode plot
Root locus
Nyquist plot
Nichols chart

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