Q. In root locus analysis the breakaway and break in points

View solution

Q. Gain margin and phase margin can be determined from Bode plots as well as Nyquist plot.

View solution

Q. For the factor (1 + 0.5 jω) the corner frequency is

View solution

Q. For any transfer function, the constant phase angle loci are

View solution

Q. For an m x n matrix A, the eigen values are the roots of the characteristic equation

View solution

Q. In force current analogy, displacement x is analogous to

View solution

Q. Consider the following statements about variable reluctance stepper motor used in control system

1. The static torque acting on rotor is a function of angular misalignment between stator and rotor teeth
2. There are two positions of zero torque i.e, . Q = 0 and 180°/T where T is the number of rotor teeth
3. Both zero torque positions are stable
4. When stator is excited, rotor is pulled into minimum reluctance position

Of these statements, the correct ones are

View solution

Q. In a two phase servomotor the two stator windings have a phase difference of

View solution

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

View solution

Q. In a two phasor servomotor, the direction of rotation of the rotating field depends on

View solution

Q. Assertion (A): Points in the s plane at which function G(s) is not analytic are called singular, points.

Reason (R): Singular points at which the function G(s) or its derivative approach infinity are called poles.

View solution

Q. If damping ratio is 0.5, the lines joining complex poles with origin are inclined to negative real axis at

View solution

Q. At corner frequency the phase angle of factor 1/(1 + jωT) is - 45°

View solution

Q. The permanent magnet field system of brushless dc servo- motor is generally on

View solution

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.

View solution

Q. The phase difference (jω - p1) means

View solution

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

View solution

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

View solution

Q. Which control action can never be used alone?

View solution

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

View solution