Q. Assertion (A): When the phase margin of a control system is improved using a lead network, noise transmission increases.

Reason (R): Phase lead compensation increases bandwidth.

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Q. The entries in the first column of Routh array of a fourth order are 5, 2, - 0.1, 2, 1. The number of poles in the right half plane are

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Q. In Bode diagram (log magnitude plot) the factor (jω)^n in the transfer function gives a line having slope

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Q. The magnitude of transport lag factor is always zero.

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Q. If G(s) H(s) = 1/(s²+100), the closed loop poles are on

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Q. A system has 12 poles and 2 zeros. Its high frequency asymptote in its magnitude plot has a slope of

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Q. The open loop transfer function of a unity feedback system is G(s) = 1/(s+2)². The poles of closed loop system are at

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Q. If G(jω) = 1/(1+(jωT) the polar plot, as the frequency is varied from 0 to infinity is

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Q. Lag compensation increases bandwidth of the system.

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Q. The effect of negative feedback on distortion and bandwidth because

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Q. Which of the following rotors are used in two phase ac servomotor?

1. Solid iron rotor
2. Squirrel cage rotor
3. Drag cup rotor

Of the above the correct ones are

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Q. In a second order system with a unit step input, the speed of response is high if system is

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Q. A thermometer requires 1 minute to indicate 98% of its final response to a step input. If it is a first order system the time constant is

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Q. Assertion (A): A slight change in pole-zero configuration can cause only minor changes in root locus configuration.

Reason (R): Asymptotes show the behaviour of root loci for |s| >> 1

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Q. In a second order system ωn = 10 rad/sec and ζ = 0.1, then ωd =

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Q. In a second order undamped system, the poles are on

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Q. An open loop system has a forward path transfer function (42.25)/s(s + 6.5). The unit step response of the system starting from rest will have its maximum value at a time equal to

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Q. Which of the following is not a necessary advantage of negative feedback system?

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Q. In position control system the device used for providing rate feedback voltage is

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Q. Derivative control action is effective?

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