Electronics and Communication Engineering - Communication Systems

11. 

In the spectrum of an FM wave

A. When modulation index is large, carrier frequency disappears
B. carrier frequency cannot disappear
C. amplitude of any side band depends on modulation index
D. the total number of side bands depend on modulation index

Answer: Option C

Explanation:

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12. 

The reactance of bypass capacitor in a CE amplifier circuit should be

A. equal to the resistance in parallel with it
B. equal to 10% or less of the resistance in parallel with it
C. equal to 50% of the resistance in parallel with it
D. independent of the resistance in parallel with it

Answer: Option B

Explanation:

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13. 

In a radar system the solution to blind speed problem is to

A. use MTI
B. use monopoles
C. vary PRF
D. change Doppler frequency

Answer: Option C

Explanation:

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14. 

For a FM wave carrier modulating frequency is 10 kHz and bandwidth is 2 MHz. If the modulating signal amplitude is doubled, the bandwidth will be

A. 0.5 MHz
B. 1 MHz
C. 2 MHz
D. 4 MHz

Answer: Option D

Explanation:

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15. 

In band III of TV, distant reception (beyond line of sight range) is possible due to

A. tropospheric bending by refraction
B. reflection of waves
C. ionospheric scattering
D. none of the above

Answer: Option A

Explanation:

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