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Control Systems

Control Systems
The open loop transfer function of non unity negative feedback system is , then the number of root locus branches equal to

 1.
 3.
 0.
 2.

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Control Systems
The open loop transfer function of a unity feedback control system is given by G(s) = k/s(s+1). If gain k is increased to infinity, then damping ratio will tend to become

 unity
 infinite
 0.707
 zero

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Control Systems
Sparking between the contacts can be reduced by inserting

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

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Control Systems
The open loop transfer function for unity feedback system is given by 5(1+0.1s) / (s(1+5s)(1+20s)) Find the steady state error for a step input of magnitude 10 is equal to

 zero.
 5.
 infinite.
 2.

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Control Systems
Lowest critical frequency is due to zero and it may be present at the origin or nearer to the origin, then the type of network is

 LC circuit.
 RLC circuit.
 RC circuit.
 RL Circuit.

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Control Systems
Given the transfer function of a system. Which of the following characteristics does it have?

 Critical damped
 any of the above
 Under damped
 Over damped

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