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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
In the field controlled motor the entire damping comes from

Motor friction and load
Armature resistance
Back emf
Field resistance

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

Zero
less than 1
1
More than 1

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Automatic Control Systems
In control systems the output of sensor usually, is

Mechanical signal
Analog electrical signal
Analog or digital electrical signal
Digital electrical signal

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Automatic Control Systems
In Bode plots the frequency at which two asymptotes meet is called corner frequency.

False
True

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

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