Electrical Engg (EEE) - MCQ Practice Questions

In a closed-loop control system, the feedback path gain is reduced from 1 to 0.5. How does this affect the system's steady-state error?

Which of the following is NOT a characteristic of a proportional (P) controller?

For a unity feedback system with G(s) = K/(s(s+3)(s+5)), what is the system type?

A second-order system has damping ratio ζ = 0.5. What is the nature of its response?

In root locus analysis, as the gain K increases from 0 to ∞, the closed-loop poles move along specific paths. Where do these paths originate?

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?

For the open-loop transfer function G(s)H(s) = K(s+1)/((s+2)(s+3)(s+4)), the system order is:

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?

For a second-order system with natural frequency ωn = 5 rad/s and ζ = 0.7, the peak time tp is approximately:

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

In a state-space representation, if the system has 4 state variables, what is the dimension of the state vector?

A negative feedback system's loop gain L(s) = G(s)H(s) has a pole-zero excess of 2. What can be concluded?

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 feedback system's sensitivity function S(s) = 1/(1+L(s)) where L(s) is loop gain. For large |L(s)|, what happens to |S(s)|?