Test: Automatic Control Systems - 5 - Electrical Engineering (EE) MCQ

The signal flow graph of a system is shown in the given figure. The effect of disturbance T_D can be reduced by

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.

A synchro transmitter receiver unit is a

The transfer function of transportation lag is

In the given figure the input frequency f = 0.1 (1/2 p RC)

A lead compensator is basically a

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.

The transfer function can be for

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

In response to a unit step input the controller output in given figure is for

If then f(t) =

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?

Given figure shows the magnitude plot for a system. The steady state error for unit step input is

DC servomotors are, generally