Electronics and Communication Engineering - Communication Systems

1. 

If the target cross-section is changing, the best scanning system for accurate tracking is

A. lobe switching
B. monopulse
C. sequential lobing
D. conical scanning

Answer: Option B

Explanation:

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2. 

If e = 10 sin(108 t + 3 sin 104 t) then the modulation index is

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

Answer: Option C

Explanation:

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3. 

Frequency modulation consists in

A. varying the frequency and amplitude of the carrier in accordance with the instantaneous value of modulating signal
B. varying the amplitude of the carrier in accordance with the instantaneous value of the modulating voltage
C. varying the frequency of the carrier voltage in accordance with the instantaneous value of the modulating voltage
D. vary the frequency of the carrier voltage

Answer: Option C

Explanation:

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4. 

Pulse modulation is often used in

A. microwave band
B. FL band
C. telegraphy
D. telephony

Answer: Option C

Explanation:

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5. 

Thermal noise has a power spectral density which is quite uniform upto frequencies in the order of

A. 100 Hz
B. 106 Hz
C. 109 Hz
D. 1013 Hz

Answer: Option D

Explanation:

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