# Electronics and Communication Engineering - Exam Questions Papers

36.

Assuming that flip-flops are in reset condition initially, the count sequence observed at QA in the circuit shown is

 A. 0010111... B. 0001011... C. 0101111... D. 0110100...

Explanation:

37.

The Taylor series expansion of at x = p is given by

 A. B. C. D.

Explanation:

.

38.

F = ∑(0, 3, 4, 5, 7) =

 A. [B ⊕ C] + AC B. B'C' + BC + AC C. AB + BC + CA D. None

Explanation:

39.

The matrix A is defined as A = . The eigen values of A2 are

 A. -1, -9, -4 B. 1, 9, 4 C. 1, 3, -2 D. -1, -3, 2

Explanation:

Since the given matrix is triangular, roots are elements of the principle diagonal.

i.e. 1A = - 1, - 3, 2

1A2 = (- l)2, (- 3)2, (2)2 = 1, 9, 4.

40.

A uniform plane wave travelling in air is incident on the plane boundary between air and another dielectric medium with er = 15. The reflection coefficient for normal incidence is

 A. 0.6 ∠0° B. 1 ∠0° C. 0.6 ∠180° D. 1.2 ∠180°

Explanation:

Coefficient =

Coefficient = 0.6 ∠180°.