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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 9
26.
In the given figure
.
The damped frequency is __________ .
0 rad/sec
2 rad/sec
3/2 rad/sec
None of these
Answer: Option
Explanation:

Damped frequency

ωd = 3/2.

27.
For a medium σ = 2.1 x 10-4 mho/m and ε = 80 e0 at a frequency of 5 GHz its loss tangent is
1 x 10-5
9.45 x 10-6
1.31 x 10-4
Answer: Option
Explanation:

= 9.45 X 10-6.

28.
For the output F to be 1 in the logic circuit shown, the input combination should be
A = 1, B = 1, C = 0
A = 1, B = 0, C = 0
A = 0, B = 1, C = 0
A = 0, B = 0, C = 1
Answer: Option
Explanation:

B = A

F = A⊙B⊙C = A⊙A⊙C so,

F = 1 when C = 1.

29.
The ROC of Z-transform of the discrete time sequence x(n) is
2 > |Z| > 3
Answer: Option
Explanation:

.

30.
Assuming the OP-AMP to be ideal, the voltage gain of the amplifier shown in figure is
Answer: Option
Explanation:

By rearranging

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