Electronics and Communication Engineering - Exam Questions Papers

41. 

Which of the following stages has no phase inversion of the signal?

A. Two CE stages
B. Three CE stages
C. CE and CC stages
D. CE stage and emitter follower

Answer: Option A

Explanation:

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42. 

The stage marked X in the architecture shown below of a two stage op-amp is :

A. Direct coupled amplifier
B. Buffer amplifier
C. Level shifter
D. Blocking oscillator

Answer: Option C

Explanation:

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43. 

Multiple member of antennas are arranged in arrays in order to enhance what property?

A. Both directivity and bandwidth
B. Only directivity
C. Only bandwidth
D. Neither directivity nor bandwidth

Answer: Option B

Explanation:

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44. 

The 4 point Discrete Fourier Transform (DFT) of a discrete time sequence {1, 0, 2, 3} is

A. [0, - 2 + 2j, 2, - 2 - 2j]
B. [2, 2 + 2j, 6, 2 - 2j]
C. [6, 1 - 3j, 2, 1 + 3]
D. [6, - 1 + 3j, 0, - 1 - 3j]

Answer: Option D

Explanation:

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45. 

Which of the following materials in not an insulator?

A. Diamond
B. Graphite
C. Bakelite
D. Lucite

Answer: Option B

Explanation:

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