# Electronics and Communication Engineering - Exam Questions Papers

11.

Efficiency of general AM signal with em = E1 cos ω1t + E2 cos ω2t with modulation index m1 and m2 is __________ .

 A. B. C. D.

Explanation:

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12.

Poynting vector is associated with

 A. flux in magnetic field B. power flow in electrostatic field C. current in electrostatic field D. charge in electrostatic field

Explanation:

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13.

A random process x(t) is defined by x(t) = 2 cos (2pt + Y) where Y is a discrete random variable with
P(Y = 0) = and
Then Rxx (0, 1) =

 A. 1 B. C. 2 D.

Explanation:

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14.

Consider points P and Q in the x-y plane, with P = (1, 0) and Q = (0, 1). The line integral 2 (xdx + ydy) along the semicircle with the line segment PQ as its diameter

 A. is - 1 B. is 0 C. is 1 D. depends on the direction (clockwise or anti-clockwise) of the semicircle

Explanation:

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15.

What are the counting stages (Q1, Q2) for the counter shown in the figure below?

 A. 11, 10, 00, 11, 10, ... B. 01, 10, 11, 00, 10, ... C. 00, 11, 01, 10, 00, ... D. 01, 10, 00, 01, 10, ...