Q. The slope of log magnitude curve changes by - 40 dB/decade at a certain frequency and the error between asymptote and actual curve is positive. This means that

View solution

Q. A system has high gain and phase margin. The system is

View solution

Q. A proportional controller is basically

View solution

Q. Nyquist stability criterion is based on a theorem from the theory of complex variables.

View solution

Q. For the function G(s) H(s) = 1/s(s+1)(s+0.5) the phase cross-over frequency is

View solution

Q. While forming Routh's array, the situation of a row of zeros indicates that the system

View solution

Q. Assertion (A): In liquid system the ratio of change in liquid level to change in flow rate is called resistance of liquid flow.

Reason (R): In liquid level systems the ratio of change in liquid stored in a tank to the change in head is called capacitance of tank.

View solution

Q. Assertion (A): When the performance of a stable second order system is improved by a PID controller, the system may become unstable.

Reason (R): PID controller increases the order of the system to 3.

View solution

Q. The root locus branches

View solution

Q. In force voltage analogy, displacement is analogous to

View solution

Q. M circles are symmetrical with respect to real axis.

View solution

Q. For the system with T(s) = 4/(s²+2s+4), the maximum resonance peak is

View solution

Q. The polar plot of transport lag is a unit circle.

View solution

Q. For the transport lag G(jω) = e^(-jωT), the polar plot is

View solution

Q. Consider the following statements:

1. The positiveness of coefficients of characteristic equation is necessary as well as sufficient condition for stability of first and second order systems.
2. The positiveness of coefficients of characteristic equation ensures negativeness of real roots but is not sufficient condition for stability of third and higher order systems.

Out of above statements:

View solution

Q. The frequency at which phase angle is 180° is called

View solution

Q. In a mechanical accelerometer, the steady state displacement is a measure of

View solution

Q. A unity feedback system has G(s) = 10/s(s+1)(s+2). If input r(t) = 1 + 2t + 3/2t³, the steady error is

View solution

Q. Assertion (A): The root locus of a control system is symmetrical about real axis.

Reason (R): For all polynomials with real coefficients, complex poles always occur in conjugate pairs.

View solution

Q. In log magnitude Bode diagram the slope of high frequency asymptote of (1 + jωT) is

View solution