This set of Control Systems Multiple Choice Questions & Answers (MCQs) focuses on “Time Domain Analysis”.

1. The identical first order system have been cascaded non-interactively. The unit step response of the systems will be:

a) Overdamped

b) Underdamped

c) Undamped

d) Critically damped

2. A third order system is approximated to an equivalent second order system. The rise time of this approximated lower order system will be:

a) Same as the original system for any input

b) Smaller than the original system for any input

c) Larger than the original system for any input

d) Larger or smaller depending on the input

3. The system with the open loop transfer function 1/s(1+s) is:

a) Type 2 and order 1

b) Type 1 and order 1

c) Type 0 and order 0

d) Type 1 and order 2

4. A system has a single pole at origin. Its impulse response will be:

a) Constant

b) Ramp

c) Decaying exponential

d) Oscillatory

5. When the unit step response of a unity feedback control system having forward path transfer function G (s) =80/s(s+18)?

a) Overdamped

b) Critically damped

c) Under damped

d) Un Damped oscillatory

6. An underdamped second order system with negative damping will have the roots :

a) On the negative real axis as roots

b) On the left hand side of complex plane as complex roots

c) On the right hand side of complex plane as complex conjugates

d) On the positive real axis as real roots

7. When the period of the observation is large, the type of the error will be:

a) Transient error

b) Steady state error

c) Half-power error

d) Position error constant

8. With negative feedback in a closed loop control system, the system sensitivity to parameter variation:

a) Increases

b) Decreases

c) Becomes zero

d) Becomes infinite

9. Given a unity feedback system with G (s) =K/ s (s+4). What is the value of K for a damping ratio of 0.5?

a) 1

b) 16

c) 4

d) 2

10. How can the steady state error can be reduced?

a) By decreasing the type of the system

b) By increasing system gain

c) By decreasing the static error constant

d) By increasing the input