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Automatic Control Systems

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

LCD
LED
Either (a) or (b)
Photodiode

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Automatic Control Systems
Integral control action

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

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Automatic Control Systems
Magnetic amplifier is used for

Power amplification
Voltage amplification
Current amplification
Frequency amplification

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Automatic Control Systems
In the field controlled motor the entire damping comes from

Motor friction and load
Back emf
Armature resistance
Field resistance

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

Load cell
Strain gauge
Thermistor
Synchro

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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
The gain is decreased below lower critical value
Both A and B

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