Electronics and Communication Engineering - Communication Systems

1. 

If sound intensity is 8 W/m2, the dB level of this sound is about

A. 5 dB
B. 50 dB
C. 129 dB
D. 1290 dB

Answer: Option C

Explanation:

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2. 

The distance of a direct broadcasting satellite from earth's surface is about

A. 1000 km
B. 10000 km
C. 36000 km
D. 55000 km

Answer: Option C

Explanation:

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3. 

Which of the following microphones has an inbuilt amplifier?

A. Condenser
B. Moving coil
C. Ribbon
D. Carbon

Answer: Option A

Explanation:

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4. 

UHF range is

A. 3 to 30 MHz
B. 30 to 300 MHz
C. 300 to 3000 MHz
D. 3000 to 30000 MHz

Answer: Option C

Explanation:

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5. 

In asynchronous TDM, for n signal sources, each frame contains m slots, where m is usually

A. Less than n
B. 2n
C. n
D. greater than 2n

Answer: Option D

Explanation:

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