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Control Systems

Control Systems
A second order under damped system has damping ratio of 0.3. Find the phase margin of the system?

 3°
 30°
 20°
 60°

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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

 e-tu(t).
 etu(t).
 et.
 e-t.

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Control Systems
What is the open loop DC gain of a unity feedback control system having closed loop transfer function as

 4/9
 13/4
 9/4
 4/13

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Control Systems
A second order control system is defined by the following equation: 4 d²c(t)/dt² + 8 dc(t)/dt + 16 c(t) = 16 u(t) The damping ratio and natural frequency for this system are respectively

 0.25 and 2 rad/s
 0.50 and 4 rad/s
 0.25 and 4 rad/s
 0.50 and 2 rad/s

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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

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

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Control Systems
The unit step error coefficient of a system with unity feedback is

 1.
 1/6.
 infinity.
 0.

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