Q. The frequency at which magnitude of closed loop frequency response is 3 dB below its zero frequency value is called critical frequency.

View solution

Q. The transfer function 1/(1+jωT) has the characteristics of high pass filter.

View solution

Q. Assertion (A): Positive feedback is not used in any circuit.

Reason (R): Positive feedback leads to instability.

View solution

Q. If the Nyquist plot does not encircle the (-1 + j0) point the system is always stable.

View solution

Q. Assertion (A): When the phase margin of a control system is improved using a lead network, noise transmission increases.

Reason (R): Phase lead compensation increases bandwidth.

View solution

Q. The entries in the first column of Routh array of a fourth order are 5, 2, - 0.1, 2, 1. The number of poles in the right half plane are

View solution

Q. In Bode diagram (log magnitude plot) the factor (jω)^n in the transfer function gives a line having slope

View solution

Q. The magnitude of transport lag factor is always zero.

View solution

Q. If G(s) H(s) = 1/(s²+100), the closed loop poles are on

View solution

Q. A system has 12 poles and 2 zeros. Its high frequency asymptote in its magnitude plot has a slope of

View solution

Q. The open loop transfer function of a unity feedback system is G(s) = 1/(s+2)². The poles of closed loop system are at

View solution

Q. If G(jω) = 1/(1+(jωT) the polar plot, as the frequency is varied from 0 to infinity is

View solution

Q. Lag compensation increases bandwidth of the system.

View solution

Q. The effect of negative feedback on distortion and bandwidth because

View solution

Q. Which of the following rotors are used in two phase ac servomotor?

1. Solid iron rotor
2. Squirrel cage rotor
3. Drag cup rotor

Of the above the correct ones are

View solution

Q. In a second order system with a unit step input, the speed of response is high if system is

View solution

Q. A thermometer requires 1 minute to indicate 98% of its final response to a step input. If it is a first order system the time constant is

View solution

Q. Assertion (A): A slight change in pole-zero configuration can cause only minor changes in root locus configuration.

Reason (R): Asymptotes show the behaviour of root loci for |s| >> 1

View solution

Q. In a second order system ωn = 10 rad/sec and ζ = 0.1, then ωd =

View solution

Q. In a second order undamped system, the poles are on

View solution