Electronics and Communication Engineering - Exam Questions Papers

41. 

At room temperature, a possible value for the mobility of electrons in the inversion layer of a silicon n-channel MOSFET is

A. 450 cm2/V-s
B. 1350 cm2/V-s
C. 1800 cm2/V-s
D. 3600 cm2/V-s

Answer: Option B

Explanation:

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42. 

Which of the following networks represents a voltage shunt feedback?

A.
B.
C.
D.

Answer: Option D

Explanation:

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43. 

A series R-C circuit with R = 3 Ω and XC = 4 Ω at 50 Hz is supplied with a voltage V = 50 + 141.4 sin 314 t. What is the RMS value of the current flowing through the circuit?

A. 5 A
B. 10 A
C. 20 A
D. 22-36 A

Answer: Option C

Explanation:

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44. 

The amplitude of a random signal uniformly distributed between - 5 V and 5 V
If the signal to quantization noise ratio required in uniformly quantizing the signal is 4.5dB, the step size of the quantization is approximately

A. 0.0333 V
B. 0.05 V
C. 0.0667 V
D. 0.10 V

Answer: Option C

Explanation:

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45. 

In TV transmission the modulation schemes for video and audio are respectively

A. FM and AM
B. FM and FM
C. AM and FM
D. AM and AM

Answer: Option C

Explanation:

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