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ECE Objective Questions { Analog Communication System }

1.  Human ear can detect sound intensities of the order of W/m2.
A. 10-20
B. 10-13
C. 10-6
D. 10-3

2. The unit of loudness is
A. phon
B. sone
C. decibel
D. mel

3. Neper is decibel.
A. larger than
B. smaller than
C. equal to
D. none of the above

4. When power ratios are expressed in dBm, the reference power is
A. 1 W
B. 1 mW
C. 1 IAW
D. none of the above

5. In a superhet broadcast receiver, the frequency of local oscillatoris the incoming signal frequency.
A. higher than
B. lower than
C. equalto
D. none of the above

6. High intermediate frequency in a superhet receiver
A. increases tracking problems
B. reduces adjacent channel rejection
C. improves selectivity
D. none of the above

7. If the carrier of a 100% modulated A.M. wave is suppressed, the power saving will be percent.

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