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Automatic Control Systems

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

Photodiode
LCD
Either (a) or (b)
LED

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Automatic Control Systems
A system is highly oscillatory if

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

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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 real axis
M = 1 straight line and imaginary axis

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Automatic Control Systems
Which of the following is used to obtain output position in a position control system?

Strain gauge
Load cell
Synchro
Thermistor

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Automatic Control Systems
Transport lag usually exists in

Hydraulic systems and thermal systems
Thermal systems
Thermal, hydraulic and pneumatic systems
Pneumatic systems

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Automatic Control Systems
Which control action can never be used alone?

Derivative
Proportional
Both (b) and (c)
Integral

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