Electronics and Communication Engineering - Exam Questions Papers

31. 

Which of the following statements is not correct?

A. Propagation delay is the time required for a gate to change its state
B. Noise immunity is the amount of noise which can be applied to the input of a gate without causing the gate to change state
C. Fan-in of a gate is always equal to fan-out of the same gate
D. Operating speed is the maximum frequency at which digital data can be applied to a gate

Answer: Option C

Explanation:

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32. 

Signal x(t) is shown below:

The values of `t' for which x(3t - 2) will be zero are:

A. 0,
B.
C.
D.

Answer: Option B

Explanation:

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33. 

Costa's receiver is used for

A. Coherent detection of AM-SC signal
B. Asynchronous detection of AM-SC signal
C. Coherent detection of DSB-SC signal
D. Asynchronous detection of DSB-SC signal

Answer: Option C

Explanation:

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34. 

The maximum concentration of the element which can be dissolved in solid silicon at a given temperature is termed as

A. Solid solubility
B. Dissolution coefficient
C. Solidification index
D. Concentration index

Answer: Option B

Explanation:

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35. 

What is the purpose of DMA facility in microprocessor based system?

A. To increase the speed of data transfer between the mP and the I/O devices
B. To increase the speed of data transfer between the mP and the memory
C. To increase the speed of data transfer between the memory and the I/O devices
D. To improve the reliability of the system

Answer: Option C

Explanation:

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