Electronics and Communication Engineering - Communication Systems

6. 

Which of the following cannot be used to demodulate SSB?

A. Complete phase shift generator
B. Product detector
C. Diode balanced modulator
D. Bipolar transistor balanced modulator

Answer: Option D

Explanation:

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7. 

The power required to produce a gain of 10 dB over 4 W of original power is __________ watt.

A. 80
B. 40
C. 0.4
D. 8

Answer: Option C

Explanation:

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8. 

Noise figure is defined as

A.
B.
C.
D.

Answer: Option C

Explanation:

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9. 

The inductance of connecting leads can be a source of

A. low frequency parasitics
B. high frequency parasitics
C. carrier frequency parasitics
D. none of the above

Answer: Option B

Explanation:

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10. 

For F2 layer the critical frequency is about

A. 500 MHz
B. 100 MHz
C. 25 MHz
D. 10 MHz

Answer: Option D

Explanation:

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