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UPPCL AE EE: Signals & Systems Quiz 1

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Question 1

Which of the following is a non-causal system?

Question 2

The signal  is a periodic signal with a period of:

Question 3

Consider the following relations :

1) x1(n) * x2(n) = x2(n) * x1(n)

2) x1(n) * [x2(n) * x3(n)] = [x1(n) * x2(n)] * x3 (n)

3) x1(n) * [x2(n) + x3(n)] = [x1(n) * x2(n)] + [x1(n) * x3(n)]

If the symbol ‘*’ indicates the convolution then which of the above relations are correct?

Question 4

The graph represents a signal defined as:

Question 5

The signal that remains the same under time scaling operation on it is

Question 6

If the energy of the signal x(t) is 25 J. Then the energy of y(t) = 5x(5t) is:

Question 7

Integration of unit ramp function gives

Question 8

Determine the frequency of the periodic waveform shown here.

Question 9

The waveform of the signal

Question 10

The energy of the signal

f(t) = 2 u(t + 1) – 4 u(t) + 2 u(t – 1) is

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