Electrical Engg (EEE) - MCQ Practice Questions

For a control system, the gain crossover frequency and phase crossover frequency are equal. What does this indicate about the system's stability margin?

A lead compensator has a transfer function Gc(s) = K(s+2)/(s+8). What is the effect of this compensator?

For a system with transfer function G(s)H(s) = 10/(s²(s+2)), the number of asymptotes in the root locus is:

Which statement is correct regarding the Bode plot of a system?

A PID controller is used for a plant. If only the derivative gain Kd is increased while keeping Kp and Ki constant, what is the primary effect?

In frequency response analysis, what does the gain margin represent?

A lag compensator has the form Gc(s) = K(s+0.1)/(s+0.01). Which characteristic does it primarily improve?

The characteristic equation of a closed-loop system is s³ + 6s² + 11s + 6 = 0. What are the poles?

For a unity feedback system, if the open-loop DC gain is 100, what is the closed-loop DC gain?

In the Routh-Hurwitz stability criterion, if the first column has a sign change, what does it indicate?

A unity feedback control system has an open-loop transfer function G(s) = 10/(s(s+2)). What is the steady-state error for a unit ramp input?

In a Bode plot, what is the phase margin when the gain crossover frequency equals the phase crossover frequency?

For a second-order system with ζ = 0.5 and ωn = 4 rad/s, what is the peak overshoot?

What is the effect of adding a pole at the origin to a stable open-loop system?

A lead compensator Gc(s) = K(s+a)/(s+b) where b > a provides maximum phase lead at frequency:

In state-space representation, if eigenvalues of A matrix are at s = -1, -2, -3, the system is:

For an underdamped second-order system, the relationship between settling time ts and damping ratio ζ is:

Which compensator is preferred for improving steady-state error without significantly affecting transient response?

A system has poles at -2±j3. The natural frequency and damping ratio are approximately:

In a unity feedback system, increasing loop gain K generally: