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Automatic Control Systems

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

LCD
LED
Either (a) or (b)
Photodiode

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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
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

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

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

Motor friction and load
Back emf
Armature resistance
Field resistance

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Automatic Control Systems
Integral control action

Removes offset
Both (a) and (b)
May lead to oscillatory response
Neither (a) nor (b)

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