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Automatic Control Systems

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

False
True

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Automatic Control Systems
Nyquist stability criterion uses open loop frequency response characteristics.

False
True

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Automatic Control Systems
The sensor generally used in incremental optical encoder is

Either (a) or (b)
LCD
LED
Photodiode

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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 close to 1
Gain margin is high

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Automatic Control Systems
The addition of a pole to the open loop transfer function pulls the root locus

To the right
To the left and making the system more stable
None of these
Towards right or left depending on the position of new pole

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

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

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