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Control Systems

Control Systems
The optimum values of damping ratio is --------------

 0.3 to 5
 0.9 to 1.1
 0.3 to 0.7
 0 to 2

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Control Systems
In signal flow graph input node is node having only------------

 incoming branches.
 outgoing branches.
 both 1 and 2.
None of these

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Control Systems
A function y (t) satisfies the following differential equation : Where, δ (t) is the delta function. Assuming zero initial condition and denoting the unit step function by u(t), y(t) can be formed as

 et.
 e-t.
 etu(t).
 e-tu(t).

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Control Systems
A proportional plus derivative controller

 both 1 and 2
 has high sensitivity
 increases the stability of the system
 improves the steady state accuracy

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Control Systems
The transfer function of a phase lead compensator is given by: G(s) = (1 + 3Ts)/(1 + Ts) where T>0. What is the maximum phase shift provided by such a compensator?

 90°
 30°
 60°
 45°

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Control Systems
The characteristic equation of a feedback control system is given by s³ + 5s² + (k + 6)s + k = 0. In the root loci diagram, the asymptotes of the root loci for large 'k' meet at a point in the s-plane whose coordinates are

 (-2,0)
 (1,0)
 (-1,0)
 (2,0)

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