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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 4
26.
For the asymptotic Bode magnitude plot shown below, the system transfer function can be
Answer: Option
Explanation:

.

27.
A square in which each (i, j)th element of matrix is equal to the negative of the conjugate complex of (j, i)th element, is called
Hermitian matrix
Skew symmetric matrix
Conjugate anti-symmetric matrix
Skew-Hermitian matrix
Answer: Option
Explanation:

When aij = - .

This matrix is called skew hermitian matrix.

28.

Mid-band gain =
100
- 100
50
- 50
Answer: Option
Explanation:

.

29.
The characteristic equation of a feedback control system is given by s3 + 5s2 + (K + 6)s + K = 0
where K > 0 is a scalar variable parameter. In the root-loci diagram of the system the asymptotes of the root-locus for large values of K meet at a point in the s-plane, whose coordinates are :
(- 3, 0)
(- 2, 0)
(- 1, 0)
(2, 0)
Answer: Option
Explanation:

Apply R-H, and find ω by auxiliary equation.

30.
The input 3-dB frequency is :
100 Hz
148 Hz
100 kHz
None
Answer: Option
Explanation:

Input 3 dB frequency

C = 0.40 μF.

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