Q. In a synchro transmitter

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Q. The polar plot of G(jω) = 1/jω is

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Q. For an unstable system the gain margin is indicative of how much the gain should be decreased to make the system stable.

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Q. For a stable system having two or more gain crossover frequencies the phase margin is measured

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Q. In a second order system, peak overshoot is independent of

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Q. Nyquist plot provides information about absolute stability as well as relative stability.

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Q. Power handling capacity of wire wound potentiometer used in control systems is about

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Q. For stable network the real parts of poles and zeros of driving point functions must be

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Q. A compensating network has Gc(s) = (1+αTs)/(1+Ts) . If it is a phase lag circuit the value of a should be

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Q. If Z is the number of zeros of 1 + G(s) H(s) in the right half s plane. N is the number of clockwise encircle elements of (-1 + jo) point. P is the number of poles of G(s) H(s) in right half s plane. The Nyquist stability criterion can be expressed as

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Q. The number of stator field windings in an ac tachometer are

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Q. The radius of constant N circle for N = 1 is

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Q. In using Nyquist stability criterion it is not necessary to determine closed loop poles.

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Q. The angular location of poles depends on

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Q. For the characteristic equation s⁵ + s⁴ + 2s³ + 2s² + 3s + 15 = 0, the number of roots in left half s plane are

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Q. At corner frequency the phase angle of factor 1/(1 + jωT) is

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Q. Frequency response approach is a simple approach to control system design.

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Q. For a second order system with 0 < ξ < 1, the angle which poles make with negative real axis is

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Q. The resolution of a wire wound potentiometer is about

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Q. Consider the following statements

1. The effect of feedback is to reduce system error
2. Feedback increases the system gain at one frequency but reduces the system gain as another frequency
3. Feedback can cause an originally stable system to become unstable

Which of the above statements are correct?

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