Q. In control systems the output of sensor usually, is

View solution

Q. Magnetic amplifier is used for

View solution

Q. Assertion (A): In simplifying block diagram the product of transfer functions in feed forward direction must remain the same.

Reason (R): In simplifying block diagram the product of transfer functions around a closed loop must remain the same.

View solution

Q. For a type 1 system and unit parabolic input, the steady state error is

View solution

Q. Consider the following statements about polar plots

1. Addition of a non-zero pole to a transfer function results in further rotation of polar plot through an angle of - 90° as ω → ∞
2. Addition of a pole at the origin to a transfer function rotates the polar plot at zero and infinite frequencies by a further angle of - 90°

Of the above statements:

View solution

Q. The relative stability of a system is given by

View solution

Q. Assertion (A): Nyquist stability criterion uses the number of encirclements around (-1 + j0) point in GH plane to determine stability

Reason (R): The (-1 + j0) point in the s plane lies in the Nyquist path.

View solution

Q. In a two phase servomotor the voltages applied to the two stator windings

View solution

Q. The addition of a pole to the open loop transfer function pulls the root locus

View solution

Q. Polar plot of a lag-lead compensator is a circle.

View solution

Q. For a type 0 system and unit ramp input, the steady state error is

View solution

Q. In control systems the word controller includes

View solution

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