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Control Systems

Control Systems
The closed loop transfer function of a unity feedback control system is 9/(s² + 3s + 9), then the type of the system is

 2
 1
 0
 3

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Control Systems
Force balancing equation for elastic element (K) is (where, x = displacement)

 K dx/dt
 K d2x/dt2
None of these
 K *x

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Control Systems
Two identical first order systems have been cascaded non interactively. The unit step response of the systems will be

 under damped
 un damped
 Over damped
 critical damped

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Control Systems
The second order system defined by 25/(s2 + 5s + 25) is given a step input. The time taken for the output to settle with in 2 % of input is

 2 sec.
 1.2 sec.
 1.6 sec.
 0.4 sec.

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Control Systems
Time constant is defined as the time taken by the response of the system to reach ----------- ?

 50% of the final value
 70.7% of the final value
 63% of the final value
 100% of the final value

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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

 infinite
 zero
 unity
 0.707

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