# Electronics and Communication Engineering - Exam Questions Papers

6.

Assertion (A): As the length of the resonant antenna is increased, the number of lobes increases and the direction of the major lobes is closer and closer to the direction of the diode.

Reason (R): As the length increases, the current distribution along the wire becomes more and more uniform.

 A. Both A and R are individually true and R is the correct explanation of A B. Both A and R are individually true but R is not the correct explanation of A C. A is true but R is false D. A is false but R is true

Explanation:

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7.

In the circuit below, the diode is ideal. The voltage V is given by

 A. min(Vi, 1) B. max(Vi, 1) C. min (-Vi, 1) D. max (-Vi, 1)

Explanation:

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8.

Which of the following is true?

 A. The poisson distribution is limiting case of binomial distribution. B. In symmetrical distribution, the mean, median and mode coincide. C. Regression is the estimation or production of unknown values of one variables from known values of another variable. D. All are true.

Explanation:

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9.

The electric field of uniform plane wave is given by E = 20 sin (2 p x 108t- pz) x + 20 cos (2 p x 108t - pz) y. The wave propagates in direction of

 A. B. C. D.

Explanation:

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10.

The characteristic polynomial of a system is q(s) = 2s5 + s4 + 4s3 + 2s2 + 1. The system is :

 A. stable B. marginally stable C. unstable D. oscillatory