Q. Assertion (A): When the forward gain of a system is increased, the transient response becomes oscillatory.

Reason (R): Increasing the forward gain reduces steady state error.

View solution

Q. Assertion (A): A. For a unity feedback system, with G(s) = K/s(s+2) , the settling time of step response is constant for all values of K ≥ 1

Reason (R): The real part of the roots for all values of K ≥ 1 are negative.

View solution

Q. Assertion (A): F(s) is valid throughout s plane except at poles of F(s).

Reason (R): £[f1(t) + f2(t)] = £[f1(t)] + £[f2(t)]

View solution

Q. At low frequencies the factor e^(-jωT) and 1/(1+jωT) behave simple.

View solution

Q. The overall transfer function for a unity feedback system is 4/(s² + 4s + 4). Which of the following statements about this system are correct?

1. Position error constant Kp is 4
2. System is type 1
3. Velocity error constant is finite

Select the answer as per following code:

View solution

Q. Bandwidth is proportional to speed of response.

View solution

Q. The complicated shapes in the polar plots are only due to time constants in the numerator of transfer functions.

View solution

Q. For a quadratic factor in denominator of transfer function the phase angle at corner frequency (in Bode phase angle plot)

View solution

Q. In terms of ξ and ωn the settling time (5% criterion) of a second order system for a step input, is equal to

View solution

Q. The poles of an RC function

View solution

Q. G(s) = 1/(s² + 0.2s + 1). It is required that response settles to within 2% of final value for a step input. The settling time is

View solution

Q. If zeros at infinity are included in the count, the number of zeros of G(s) H(s) is

View solution

Q. The distance of poles from origin depends on

View solution

Q. In the field controlled motor the entire damping comes from

View solution

Q. Assertion (A): An on off controller gives rise to oscillation of the output between two limits.

Reason (R): Location of a pair of poles on jω axis gives rise to self sustained oscillations in the output.

View solution

Q. Consider the following statements about transport-lag

1. It is of non-minimum phase behaviour
2. It normally exists in thermal, hydraulic and pneumatic systems
3. It has an excessive phase lag with no attenuation at high frequency

Which of the above statements are correct?

View solution

Q. Consider the following statements:

1. If any root of characteristic equation has a positive real part the impulse response is unbounded and system is unstable.
2. If all the roots of a characteristic equation have negative real parts, the impulse response decays to zero.
3. If one or more non-repeated roots of characteristic equation are on jω axis impulse response is bounded but the system is unstable.

Which of the above equations are correct?

View solution

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