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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Q. Which of the following is used to obtain output position in a position control system?

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Q. In a synchro transmitter-control transformer, the voltage induced in rotor winding of control transformer is zero when the angular displacement between rotors of transmitter and transformer is

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Q. DC tachogenerator can be used in

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Q. Assertion (A): If points at infinity are included, G(s) has same number of poles and zeros.

Reason (R): The function G(s) = K(s+2) / (s+5)² has a zero at s = - 2.

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Q. If the characteristic equation is (λ + 1) (λ + 2) (λ + 3) = 0, the eigen values are

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Q. Lag compensation permits a high gain at low frequencies.

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Q. If the poles lie in second quadrant, damping ratio is

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Q. Assertion (A): When performance specifications are given in term of transient response characteristics, root locus method is a suitable method.

Reason (R): When performance specifications in terms of state variables are given, modern control methods can be used.

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Q. The effect of adding poles and zeros can be determined quickly by

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