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Automatic Control Systems

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

Photodiode
Either (a) or (b)
LCD
LED

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

Both (b) and (c)
Proportional
Integral
Derivative

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Automatic Control Systems
For any transfer function, the constant phase angle loci are

A family of straight lines
Either (a) or (b)
Neither (a) nor (b)
A family of circles

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Automatic Control Systems
If poles lie in first quadrant, damping ratio is

More than 1
Zero
less than 1
1

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Automatic Control Systems
Lag compensation permits a high gain at low frequencies.

False
True

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Automatic Control Systems
Magnetic amplifier is used for

Frequency amplification
Voltage amplification
Power amplification
Current amplification

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