Electronics and Communication Engineering - Communication Systems

1. 

The block diagram of AM transmitter in which high level modulation is used as shown in figure. The block X could be

A. audio power amplifier
B. buffer RF amplifier
C. compressor amplifier
D. none of the above

Answer: Option B

Explanation:

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2. 

In FM 'guard band' is provided

A. to limit upper frequency limit
B. to limit lower frequency limit
C. so that there is less adjacent channel interference
D. to limit transmitted power of a station

Answer: Option C

Explanation:

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3. 

Assertion (A): FM requires more bandwidth than AM

Reason (R): Wide band FM is used for broadcast transmissions.

A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

Answer: Option B

Explanation:

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4. 

When E1, E2, E3 etc. are the simultaneous modulating voltages, then the total modulating voltage Et will be

A. Et = E1 + E2 + E3 + ...
B. Et= E12 + E22 + E32 + ...
C.
D.

Answer: Option C

Explanation:

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5. 

A frequency doubler has an FM signal input at 13 MHz with a deviation of 5 kHz. The output, frequency for the carrier will be

A. 26 MHz
B. 26.1 MHz
C. 10 kHz
D. 160 kHz

Answer: Option D

Explanation:

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