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

1. The transient response, yt(t), of a system becomes ____ as t tends to infinity.**a) 0**

b) 1

c) Infinity

d) Undefined

2. The steady state value of a system is _____ it’s a transient response.**a) dependent on**

b) independent of

c) greater than

d) not observable from

3. Delay time is the time required by a system to reach a quarter of its steady state value.

a) True**b) False**

4. For non-unity feedback system, the error is calculated with respect to the reference signal.

a) True**b) False**

.

5. What is the output of the following code?

>>p=[0 1]; >> q=[ 1 -1 0]; >> step(p,q)

**a) An unstable response**

b) A stable response

c) A marginally stable response

d) A marginally unstable response

6. Which of the following command will reveal the damping ratio of the system?**a) damp()**

b) damp[]

c) damping{}

d) dr()

7. What is the output of the following code?

>>p=[ 1 0 1]; >> q=[ -1 1]; >> step(p,q);

a) An unstable step response

b) A stable step response**c) Error**

d) A marginally unstable response

8. What is the output of the following code?

tf({1},{1 1})

**a) Error**

b) 1/s+1

c) s+1/1

d) 1/s

9. If the damping factor is zero, the unit-step response is**a) Purely sinusoidal**

b) Ramp function

c) Pulse function

d) Impulse function

10. What is the output of the following code?

impulse([1],[1 1])

**a) e-t*u(t)**

b) e-t*u(-t)

c) e-t*u(t)

d) e+t*u(t)

11. If the damping ratio is equal to 1, a second-order system is _________

a) having maginary roots of the characteristic equation

b) underdamped

c) critically damped with unequal roots**d) critically damped with equal roots**

12. From the following graphs of the generalized transfer function 1/s+a, which plot shows a transfer function with a bigger value of a?

a) Blue plot

b) Red plot

c) Yellow plot**d) Purple plot**

13. From the following graphs of the generalized transfer function 1/as2, which plot shows the transfer function for a higher a?

a) Blue

b) Red

c) Yellow**d) Purple**

14. If the damping factor is less than the damping factor at critical damping, the time response of the system is ___________**a) Underdamped**

b) Overdamped

c) Marginally damped

d) Unstable

15. The steady state error of the system with a forward path transfer function G(s)=13(s-1)/(s-1) and with a parabolic input is _______**a) Infinite**

b) 0

c) -Infinite

d) Undefined

16. For a step response of the system 1/s2+1, the maximum overshoot is __________

a) 1

b) 0

c) Infinite**d) 2**

17. What is the gain of the system derived from the following code?

tf[1,100]

a) 1/100

b) s/100

c) 1/100s**d) Error**

18. What is the output of the following code?

step(impulse(1,[1 0]))

a) A ramp function

b) A parabolic function

c) A step function**d) Error**

19. What is the output of the following code?

r.DampingRatio = 0; overshoot = getOvershoot(r);

a) 100

b) 0

c) 1**d) Error**

20. Which of the following command gives the step response characteristics of a control system?

a) stepinf()**b) stepinfo()**

c) stepinfo[]

d) step()

21. Which of the following command generates the impulse response of a system which has more zeros than poles?

a) impulse()

b) impulse[]

c) impulse{}**d) No such command**

22. Which of the following command generates the transfer function of a system?**a) tf()**

b) tf[]

c) tf{}

d) No such command

23. What is the output of the following code?

step([1],[1 0 0])

**a) A parabola**

b) A ramp function

c) A step function

d) An impulse function

24. The time constant of a system is ________

a) equal to the damping constant**b) inverse of the damping constant**

c) twice the damping constant

d) half of the damping constant

25. If the natural frequency of a system increases, the rise time ________

a) Increases**b) Decreases**

c) Doubles

d) Halves

26. The settling time is a measure of _________**a) The speed of reaching stead state**

b) The speed of reaching maximum overshoot

c) The speed of reaching second overshoot

d) Nothing

27. If the poles of a system transfer function are equal and imaginary, the system is ________**a) Undamped**

b) Critically damped

c) Overdamped

d) Negatively damped

28. For negative damping, the system is unstable.**a) True**

b) False

29. An undamped system is stable.

a) True**b) False**