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Automatic Control Systems

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

True
False

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Automatic Control Systems
The complicated shapes in the polar plots are only due to time constants in the numerator of transfer functions.

True
False

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

LCD
Either (a) or (b)
LED
Photodiode

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Automatic Control Systems
A conditionally stable system is stable for the value of gain between two critical values. It is unstable if

The gain is decreased below lower critical value
Both A and B
The gain is increased beyond upper critical value
None of these

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Automatic Control Systems
Which of the following is open loop system?

Aqualing
System for controlling antirocket missiles
Respiratory system of animal
Wind screen wiper

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Automatic Control Systems
M circles are symmetrical with respect to

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

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