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Automatic Control Systems

Automatic Control Systems
The relative stability of a system is given by

Both phase and gain margins
Phase margin alone
Either (a) or (b)
Gain margin alone

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Automatic Control Systems
In a simple on-off controller with differential gap, the magnitude of differential gap determines

The life of controller
Both (a) and (b)
Neither (a) nor (b)
The level of accuracy

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Automatic Control Systems
The effect of adding poles and zeros can be determined quickly by

Bode plot
Nichols chart
Root locus
Nyquist plot

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Automatic Control Systems
Magnetic amplifier is used for

Power amplification
Frequency amplification
Current amplification
Voltage amplification

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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

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

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

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