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Control Systems

Control Systems
First Foster form of a LC network represents which element in the beginning?

 Both A and B.
 Capacitor.
 Resistor.
 Inductor.

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Control Systems
Which of the following is the correct expression for the transfer function of an electrical RC phase lag compensating network?

 RCS/(1+RCS)
 C/(1+RCS)
 1/(1+RCS)
 RC/(1+RCS)

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Control Systems
Number of sign changes in the entries in 1st column of Routh array denotes the no. of

 open loop poles in RHP.
 open loop zeroes in RHP.
 zeroes of system in RHP.
 roots of characteristic polynomial in RHP.

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Control Systems
The type number of the control system with G(s) = k(s+2)/(s(s²+2s+3) is

 2
 3
 1
 0

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Control Systems
The characteristic equation for closed loop system is given as . The value of k for which the system becomes just stable is

 6
 8
 4
 2

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Control Systems
A unity feedback control system has an open loop transfer function G(s) = k/(s(s² + 7s + 12) The gain k for which s = -1 + j1 will lie on the root locus of the system is

 10
 4
 6.5
 5

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