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Automatic Control Systems

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

True
False

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

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Automatic Control Systems
Which dc servomotor requires strongest permanent magnet?

Surface wound armature
Slotted armature
Either A or B
Surface wound with stationary rotor

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

Motor friction and load
Back emf
Field resistance
Armature resistance

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Automatic Control Systems
Nichols chart consists of

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

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

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

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