Electronics and Communication Engineering - Exam Questions Papers

36. 

Which of the following does not cause losses in optical fibre cables?

A. Impurities
B. Microbending
C. Attenuation in glass
D. Stepped index operation

Answer: Option D

Explanation:

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37. 

Which of the following introduces mode partition noise?

A. Coaxial line
B. Waveguide
C. Fibre transmission line
D. Both coaxial line and waveguide

Answer: Option B

Explanation:

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38. 

Foster Seeley discriminator uses a

A. double tuned circuit in which primary and secondary are tuned to different frequencies
B. double tuned circuit in which primary and secondary are tuned to same frequencies
C. single tuned circuit
D. three triodes in series

Answer: Option B

Explanation:

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39. 

Consider the differential amplifier shown in figure. (Assume β is very high).

Zin (base) =

A. 1 MΩ
B. 100 kΩ
C. 15 kΩ
D. ≈ 0

Answer: Option C

Explanation:

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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

A. Both (A) and (R) are true and (R) is the correct explanation of (A)
B. Both (A) and (R) are true but (R) is not the correct explanation of (A)
C. (A) is true but (R) is false
D. (A) is false but (R) is true

Answer: Option B

Explanation:

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