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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?

 30°
 20°
 60°
 3°

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Control Systems
The transfer function of a linear time invariant system is given as G(s) = 10/(s² + 10s + 10). The steady state value of the output of the system for step input applied at time instant t=2 sec will be

 1
 undefined
 infinity
 0

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Control Systems
Find the angles of asymptotes of the open loop transfer function G(s) = k(s + 1)/((s(s+2)(s+4)?

 0°, 180°
 90°,180°
 90°,270°
 60°,240°

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Control Systems
To achieve the optimum transient response, the indicating instruments are so designed as to

 be undamped.
 provide damping which is slightly more than the critical value.
 provide damping which is slightly less than the critical value.
 be critically damped.

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Control Systems
The impulse response of a system is c(t) = -te-t + 2 e-t (t>0). Its open loop transfer function is

 (2s+2)/(s+1)²
 (2s+1)/(s+1)²
 (2s+2)/s²
 (2s+1)/s²

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Control Systems
The amplitude spectrum of a Gaussian pulse is

 Gaussian.
 Uniform.
 Impulse function.
 A sine function.

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