Electronics and Communication Engineering - Exam Questions Papers

11. 

Consider the following network function

In order to make N(s) as rational network function, it is essential to include

A. zero at origin
B. zero at infinity
C. pole at origin
D. pole at infinity

Answer: Option B

Explanation:

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12. 

For the polynomial P(s) = s5 + s4 + 2s3 + 2s2 + 3s + 15 The number of roots which lie in the right half of the s plane is :

A. 4
B. 2
C. 3
D. 1

Answer: Option B

Explanation:

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13. 

Noise with double-sided power spectral density of K overall frequencies is passed through a RC low pass filter with 3 dB cut-off frequency of fc. The noise power at the filter output is

A. K
B. Kfc
C. Kpfc
D.

Answer: Option C

Explanation:

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14. 

The energy stored in a magnetic field is given by

A.
B.
C.
D.

Answer: Option D

Explanation:

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15. 

Which of the following describe the correct properties of an emitter follower circuit?

  1. It is a voltage series feedback circuit.
  2. It is a current series feedback circuit.
  3. Its voltage gain in less than unity.
  4. Its output impedance is very low.
Select the correct answer from the codes given below:

A. 1, 3 and 4
B. 2, 3 and 4
C. 2 and 3 only
D. 2 and 4 only

Answer: Option A

Explanation:

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