Electronics and Communication Engineering - Exam Questions Papers

1. 

If we manage to __________ our natural resources, we would leave a better planet for our children.

A. uphold
B. restrain
C. Cherish
D. conserve

Answer: Option D

Explanation:

The clue in this sentence is 'If we manage to __________ our natural resources' and 'better planet'.

This implies that the blank should be filled by a word which means 'preserve' or 'keep for long time'.

Therefore the word 'conserve' is the right answer.


2. 

(2)3 + (3)4 = (?)5

A. 4
B. 11
C. none of these
D. not possible

Answer: Option C

Explanation:

(2)3 + (3)4 = 2 + 3 = 5 and (10)5 = 51 + 0 = 5

(2)3 + (3)4 = (10)5 .


3. 

If g(t) = e- p t2 then G(0) is __________ (where g(t)⇔ G(f)

A.
B. unity
C.
D. impulse at f = 0

Answer: Option B

Explanation:

The signal g(t) given above is a Gaussian pulse, and it satisfies the relation.

Therefore, its fourier transform is same as the signal itself in frequency domain.

i.e. G(f) = e-pf2

Hence G(f)|f = 0 = e-p(0) = 1.


4. 

The open loop transfer function of a unity feedback system is: The range of K for which the system is stable is

A.
B. 13 > K > 0
C.
D. -6 < K < ∞

Answer: Option A

Explanation:

Apply R-H.


5. 

A discrete time linear shift-invariant system has an impulse response h[n] with h[0] = 1, h[1] = - 1, h[2] - 2, and zero otherwise. The system is given an input sequence x[n] with x[0] - x[2] - 1, and zero otherwise. The number of nonzero samples in the output sequence y[n], and the value of y[2] are, respectively

A. 5, 2
B. 6, 2
C. 6, 1
D. 5, 3

Answer: Option D

Explanation:

Use convolution to get the result.


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