# Electronics and Communication Engineering - Exam Questions Papers

26.

The Function F = ∑(0, 3, 4, 5, 7) is implemented using the multiplexer then Identify the correct one :

 A. B. C. D. None

Answer: Option C

Explanation:

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27.

Which of the following Boolean algebra rules is correct?

 A. A . A = 1 B. A + AB = A + B C. A + A B = A + B D. A(A + B) = B

Answer: Option C

Explanation:

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28.

The Table given below is the mark obtained by 2 students in 8 different subjects.

The coefficient of correlation is:

 A. -0.4748 B. 0.4748 C. -0.0338 D. 0.0338

Answer: Option A

Explanation:

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29.

In PSK modulation, the input signal is :

 A. S1(t) = A cos ω0t and S2(t) = - A cos ω0t B. S1(t) = S2(t) = A cos ω0t C. D.

Answer: Option A

Explanation:

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30.

Which of the following statements about the matched filter in a communication receiver are correct?

1. Its impulse response depends on the signed shape
2. It maximizes the SNR at the detection shape.
3. It produces ISI.
4. It may produce phase error if synchronization is improper.
Select the correct answer from the codes given below:

 A. 1 and 4 only B. 1 and 2 only C. 2, 3 and 4 D. 1, 2 and 4

Answer: Option B

Explanation:

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