1 Crore+ students have signed up on EduRev. Have you? 
Examine the following statements
Which control action is also called rate control?
The signal flow graph of a system is shown in the given figure. The effect of disturbance T_{D} can be reduced by
If G_{1}(s) is increased, input is amplified more while disturbance remains the same.
For a stable system gain margin is positive. Therefore decibel value is also positive.
For overdamped systems a quadratic factor in transfer function can be replaced by two first order factors with real poles
A motor is coupled to a load through gear ratio n. If T is the motor torque, J_{m} and J_{L} are moment of inertia of rotor and load, then torque to inertia ratio referred to motor shaft is
Accurate amplitude measurements can be made more easily than accurate phase shift measurements.
The transfer function of transportation lag is
In the given figure the input frequency f = 0.1 (1/2 p RC)
X_{C} = 10R. Hence V_{0} ⋍ V_{i} .
See transfer function in the equation .
Assertion (A): The part of root locus on the real axis is not dependent on the poles and zeros which are not on the real axis.
Reason (R): Poles and zeros which are not on the real axis occur in conjugate pairs
In Bode diagram (log magnitude plot) of the factor 1/(1 + jωT) in the transfer function the log magnitude for ω << 1/T can be approximated by
For underdamped second order systems the rise time is the time required for the response to rise from
The phase angle of is constant and equal to  90º for all values of ω
The open loop frequency response of a unity feed back system is as under
The gain margin and phase margin respectively are
Assertion (A): A large negative feedback is deliberately introduced in an amplifier to make its gain independent of variation in parameters of active device.
Reason (R): A large negative value of feedback results in a high value of return difference compared to unity which makes the feedback gain inversely proportional to the feedback factor.
Gain with feedback = .
An electromechanical device which actuates a train of step angular movements in response to a train of input pulses on one to one basis is
For a lead compensator and a < 1
Therefore is more than .
In response to a unit step input the controller output in given figure is for
The intercept on yaxis is due to proportional action and inclined line is due to integral action.
When time constant T in any factor is varied, the shapes of log magnitude and phase angle curves remain the same.
Which of the following is not correct for two phase servomotor?
In this motor ratio is small or R is high.
Given figure shows the magnitude plot for a system. The steady state error for unit step input is
Use Code STAYHOME200 and get INR 200 additional OFF

Use Coupon Code 






