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Automatic Control Systems

Automatic Control Systems
In the field controlled motor the entire damping comes from

Field resistance
Back emf
Armature resistance
Motor friction and load

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Automatic Control Systems
A system is highly oscillatory if

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

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

Nyquist plot
Nichols chart
Root locus
Bode plot

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Automatic Control Systems
Lag compensation permits a high gain at low frequencies.

False
True

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Automatic Control Systems
Which of the following can be used as a rotating amplifier in a control system? 1. Amplidyne 2. Separately excited dc generator 3. Synchro 4. Self excited dc generator

All
3 and 4
1, 2 and 3
1 and 2

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Automatic Control Systems
In Bode plots the frequency at which two asymptotes meet is called corner frequency.

False
True

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