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Control Systems

Control Systems
The value of gain margin of the system having G ( s )H ( s ) = 8 / ( s + 2 )3 is

 6.
 2.
 4.
  8.

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Control Systems
A box which tells the effect of inputs on control sub system is known as

 Decision box.
 Logical box.
 Data Box.
 State box.

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Control Systems
The phase of lead compensator of the system G ( s ) = ( s + a ) / ( s + b ) is at its maximum at:

  √( ab ).
  ab.
 √( a / b).
  a / b.

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Control Systems
To achieve the optimum transient response, the indicating instruments are so designed as to

 provide damping which is slightly more than the critical value.
 be critically damped.
 be undamped.
 provide damping which is slightly less than the critical value.

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Control Systems
Sparking between the contacts can be reduced by inserting

 a reactor in the line.
  a capacitor in parallel with the contacts.
 a resistor in the line.
 a capacitor in series with the contacts.

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Control Systems
Find the bandwidth of the system, when rise time of the system is give as 1msec?

 750 Hz
 500 Hz
 350 Hz
 1 kHz

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