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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 21
36.
Which of the following does not cause losses in optical fibre cables?
Impurities
Microbending
Attenuation in glass
Stepped index operation
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
Which of the following introduces mode partition noise?
Coaxial line
Waveguide
Fibre transmission line
Both coaxial line and waveguide
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
Foster Seeley discriminator uses a
double tuned circuit in which primary and secondary are tuned to different frequencies
double tuned circuit in which primary and secondary are tuned to same frequencies
single tuned circuit
three triodes in series
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
Consider the differential amplifier shown in figure. (Assume β is very high).

Zin (base) =
1 MΩ
100 kΩ
15 kΩ
≈ 0
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.

Assertion (A): The line integral of B about a closed contour, in a region containing steady current, is μ0 times the total net current, following through the contour of integration.

Reason (R): The curl of B is equal to μ0 times the current density vector J

Both (A) and (R) are true and (R) is the correct explanation of (A)
Both (A) and (R) are true but (R) is not the correct explanation of (A)
(A) is true but (R) is false
(A) is false but (R) is true
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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