# Impulse Response

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

1. What is the impulse response of a system whose transfer function is that of ramp function delayed by 7 units in time?
a) r(t-7)
b) r(t+7)
c) r(t-3.5)
d) Cannot be determined

2. What is the impulse response of a system whose transfer function is that of pulse function?

a) u(t)+u(t-4)
b) u(t)-u(t-3)
c) u(t)-u(t-4)
d) u(t)-u(t+4)

3. What is the impulse response till t=16 unit in time of a system whose transfer function is that of the following?

a) 34*r(t-4) + 34*r(t-16)+u(t-16)
b) 34*r(t-4) – 34*r(t+16)-u(t-16)
c) 34*r(t-4) – 34*r(t-16)-u(t-16)
d) 34*r(t-4) – 34*r(t+16)-u(t+16)

4. What is the impulse response of the system whose transfer function is that of a pulse which generates from the following code?

`plot(0:12,[zeros(1,4),ones(1,5),zeros(1,4)])`

a) u(t-4)+u(t-9)
b) u(t+4)-u(t-9)
c) u(t-4)-u(t+9)
d) u(t-4)-u(t-9)

5. The following figure shows a set of impulse responses. Identify which system provides the greatest delay.

a) Blue
b) Red
c) Delay
d) Purple

6. The following figure shows a set of impulse responses. Identify which system provides the least delay.

a) Blue
b) Red
c) Delay
d) Purple

7. Which response has the highest amplitude of step function?

a) Yellow
b) Red
c) Blue

8. Which response has the least amplitude in the transfer function?

a) Yellow
b) Red
c) Blue

9. The o/p of the following two code snippets are ___

```i.  impulse(1,[ 6 3])
ii. impulse(1/6,[ 1 .5])```

a) Same graphs
b) Different grpahs
c) Amplitude of graph i>ii
d) Amplitude of graph i<ii

10. Fill the half-filled code snippet which generates the following curve:

_______(1,[1 __])
a) impulse, 0, 0
b) impulse, 0
c) impulse, 0 1
d) impulse, 1, 0

11. Fill the half-filled code snippet to get the following graph:

impulse(1,[1 _], ‘red’);
____;
impulse(1,[1 _], ‘blue’);
impulse(1,[1 _], ‘yellow’);
impulse(1,[1 _], ‘green’);
a) 2, hold, 3,4,5
b) 9, hold, 4,5,2
c) 5, hold, 4,3,2
d) Cannot be determined

12. Choose the correct option after observing the given graph and the code snippet carefully.

impulse(1,[1 _], ‘red’);
hold on;
impulse(1,[1 a], ‘blue’);
impulse(1,[1 b], ‘yellow’);
impulse(1,[1 _], ‘green’);
a) a<b
b) a>b
c) a=b
d) Cannot be determined

13. How does the pole of the transfer function change?

a) Goes nearer to the origin for the green curve than the red curve
b) Goes further from the origin for the red curve than the blue curve
c) Goes nearer to the origin for the blue curve than the red curve
d) Goes nearer to the origin for the red curve than the blue curve

14. Which response would provide a higher stability?
a) A step signal
b) A ramp signal
c) A sinusoidal
d) 1/(s-1)

15. The poles of the transfer function of a sinusoidal system can represent the frequency of the impulse response of the sinusoidal system.
a) True
b) False

16. The impulse response does not take account of the transient response of the system.
a) True
b) False

17. The impulse response of a parabola _________
a) will have 3 poles in the s-plane
b) will have 2 poles in the s-plane
c) will have 4 poles in the s-plane
d) will have no poles in the s-plane

18. The impulse response of a sinusoid ________
a) will have 2 poles in the s-plane
b) will have 3 poles in the s-plane
c) will have 1 pole frequency in the s-plane
d) will have only 1 conjugate pole in the s-plane

19. The step response of the impulse response of a ramp function will be ________
a) a parabolic function
b) an exponential function
c) a sinusoidal function
d) a sinc function

20. In MATLAB, the impulse response of the step response of a system is ___ to the step response of the impulse response of the system.
a) Equal
b) Not Equal
c) Greater
d) Lesser

21. The impulse response of the transfer function 1 is ________
a) an impulse function
b) a step function
c) a pulse function
d) cannot be determined

22. What is the output of the following code?

```>>p=ilaplace(1);
>>laplace(p)```

a) 1
b) Impulse function
c) Error
d) Cannot be determined

23. What is the output of the following code?

```>>p=ilaplace(s/s);
>>laplace(p)```

a) dirac(1,t)
b) dirac[1,t]
c) dirac{1,t}
d) Cannot be determined

24. What is the output of the following code?

```>>t=(0:17);
>>o=dirac(t)==Inf;
>>q=o*1;
>>conv(q,t)```

a) t followed with 17 zeros
b) t followed with 18 zeros
c) 1
d) Error

25. The impulse response is the result of the transfer function of the system.
a) True
b) False

26. What is the output of the following code?

```>>t=(0:17);
>> p=dirac(0)==Inf;
>> q=p*1;
>> conv(q,t)```

a) An impulse response of step for a time from 0:16
b) An impulse response of unit ramp function for a time from 0:17
c) An impulse response of ramp function for a time from 0:18
d) Error in 3rd line

27. What is the output of the following code?

```>> p=dirac(0)==Inf;
>> t=(0:.001:17);
>> q=p*1;
>> conv(q,sin(2*pi*t));
>> plot(t,ans)```

a) A sinusoid of a frequency 1Hz
b) A sinusoid of a frequency of 17 Hz
c) A sinusoid of a frequency of .001 Hz
d) Error

28. What is the slope of the ramp function?

a) 3
b) 2
c) 1
d) 6

29. What is the output at the scope?

a)
b)
c)
d)

30. What does the following relate to?

a) Step response implies integrating the transfer function
b) Impulse response shows the delay in the above block diagram
c) Nothing is observed
d) The integration of impulse is a ramp function