Q. Assertion (A): The phase angle plot in Bode diagram is not affected by change in system gain.

Reason (R): The variation in gain has no effect on phase margin of the system.

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Q. The phase difference (jω - p1) means

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Q. If poles lie in first quadrant, damping ratio is

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Q. For type 0 system the starting point (i.e. ω = 0) of polar plot is finite and is on positive real axis.

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Q. Which control action can never be used alone?

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Q. If G(s)H(s) = K/s(s+1)(s²+4s+20), the number of branches of root locus are

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Q. N circles for α = α1, and α = α1 ± 180° n (where n = 1, 2, 3, ....) are the same.

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Q. If G(s)H(s) = K (T₁s + 1)/[s² (T₂s + 1)] the system stability depended an relative magnitudes of T₁ and T₂.

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Q. In a simple on-off controller with differential gap, the magnitude of differential gap determines

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Q. Consider the following statements about root locus

1. The root locus is symmetrical about real axis.
2. If a root locus branch moves along the real axis from an open loop pole to zero or to infinity, this root locus branch is called real root branch.
3. The breakaway points of the root locus are the solutions of dK/dS = 0

Which statements out of above are correct?

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Q. In Bode plots the frequency at which two asymptotes meet is called corner frequency.

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Q. In Bode plots, frequency is plotted on log scale.

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Q. For a type 1 system and unit step input, the steady state error is

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Q. Nichol's chart is symmetric about - 180° axis.

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Q. If the Nyquist plot encircles the (-1 + j0) point clockwise once or more number of times, the system is unstable.

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Q. Which dc servomotor requires strongest permanent magnet?

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Q. Nichols chart consists of

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Q. Consider the following statements about root locus

1. The intersection of root locus branches with the imaginary axis can be determined by the use of Routh criterion
2. Segments of real axis having an odd number of real axis open loop poles plus zeros to their right are not parts of root locus
3. The number of root locus branches terminating on infinity is always zero

Which of the above statements are correct?

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Q. The poles with greater displacement from the real axis correspond to

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Q. Which of the following is open loop system?

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