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Control Systems

Control Systems
Force balancing equation of a dash-pot element is (where, x = displacement)

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

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Control Systems
A unity feed back system has forward transfer function The range of k for the system to be stable is

 0 < k < 390.
None of these
 0 < k < 39.
 0 < k < 3900.

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Control Systems
Transfer function of a control system depends on

 nature of input.
 system parameters alone.
 initial conditions of input and output.
 nature of output.

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Control Systems
The angle condition used for checking whether any point lies on root locus or not is...........

 ± (2q + 1) 180o.
 ± (2q) 360o.
 ± (2q) 180o.
 ± (2q + 1) 360o.

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Control Systems
A system has poles at 0.01 Hz, 1 Hz and 80 Hz; zeros at 5 Hz, 100 Hz and 200 Hz. The approximate phase of the system response at 20 Hz is

 90°
 -90°
 -180°
 180°

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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?

 60°
 30°
 90°
 45°

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