Electronics and Communication Engineering - Exam Questions Papers

1. 

A single mode fibre not suffer from which type of dispersion?

A. Waveguide dispersion
B. Material dispersion
C. Intermodal dispersion
D. Polarization mode dispersion

Answer: Option C

Explanation:

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2. 

Which of the following statements is/are true for a good conductor of electricity?

  1. Its conductivity decreases with increasing temperature.
  2. Number of free electrons is around 1028 m-3.
  3. Its conductivity decreases with addition of impurities.
  4. It is a good conductor of heat also.

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

Answer: Option A

Explanation:

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3. 

How can the bandwidth of a control system be increased?

A. By the use of phase lead network
B. By the use of phase lag network
C. By the use of both phase-lag and phase-lead network
D. By the use of cascaded amplifiers in the system

Answer: Option A

Explanation:

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4. 

If an electric network R, L and C are connected in series and supplied by a voltage source then its dual network will be described by the differential equation:

A.
B.
C.
D.

Answer: Option C

Explanation:

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5. 

A signal x1(t) and x2(t) constitute the real and imaginary parts respectively of a complex valued signal x(t). What form of waveform does x(t) possess?

A. Real symmetric
B. Complex symmetric
C. Asymmetric
D. Conjugate symmetric

Answer: Option D

Explanation:

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