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Automatic Control Systems

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

Photodiode
Either (a) or (b)
LED
LCD

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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
Towards right or left depending on the position of new pole
None of these

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Automatic Control Systems
Integral control action

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

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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
A lead compensator

Speeds up the transient response
Increases the stability margin and speeds up the transient-response.
Increases the stability margin
None of these

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Automatic Control Systems
Transport lag usually exists in

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

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