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Automatic Control Systems

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

True
False

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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

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

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Automatic Control Systems
Magnetic amplifier is used for

Frequency amplification
Voltage amplification
Current amplification
Power amplification

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Automatic Control Systems
Which dc servomotor requires strongest permanent magnet?

Slotted armature
Either A or B
Surface wound with stationary rotor
Surface wound armature

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Automatic Control Systems
Which of the following can be used as a rotating amplifier in a control system? 1. Amplidyne 2. Separately excited dc generator 3. Synchro 4. Self excited dc generator

All
1, 2 and 3
3 and 4
1 and 2

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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)
A family of circles
Neither (a) nor (b)

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