Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 5

Determine the potential difference between the points A and B in the steady state

40 V

60 V

25 V

75 V

Answer: Option

Explanation:

Find the value of K and velocity constant K_v so that the maximum overshoot in the unit step response is 0.2 and the peak time is 1 sec.

12.37, 0.175

12.86, 2.175

11.36, 1.175

1.86, 0.175

Answer: Option

Explanation:

ζ² = 0.259(1 - ζ²) = 0.259 - 0.259ζ²

1.259ζ² = 0.259

ζ² = 0.206

ζ = 0.45

ω²_n = K

∴ ωⁿ = K and 2ζω_n = 1 + KK_v

∴ ω_n = K

K = ω²_n

K = 12.37

1 + 12.37K_v = 2 x 0.45 x 3.52

K_v = 0.175 .

The transfer function of a discrete time LTI system is given by

Consider the following statements:
S1: The system is stable and causal for ROC: |z| > 1/2
S2: The system is stable but not causal for ROC: |z| < 1/4
S3: The system is neither stable nor causal for ROC: 1/4 < |z| < 1/2
Which one of the following statements is valid?

Both S1 and S2 are true

Both S2 and S3 are true

Both S1 and S3 are true

S1, S2 and S3 are all true

Answer: Option

Explanation:

S1 true, S2 False (meter stable nor causal) S3 True.