Electronics and Communication Engineering - Exam Questions Papers

31. 

For a given data rate, the bandwidth required with M-array PSK transmission is smaller than that of a binary transmission by

A. log2M
B.
C.
D.

Answer: Option D

Explanation:

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32. 

In a microprocessor, the service routine for a certain interrupt starts from a fixed location of memory which cannot be externally set, but the interrupt can be delayed or rejected. Such an interrupt is

A. non-maskable and non-vectored
B. maskable and non-vectored
C. non-maskable and non-vectored
D. maskable and vectored

Answer: Option D

Explanation:

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33. 

Which one of the following statements is not correct with regard to power amplifiers?

A. The collector current is large
B. They are used as the front end of multi-stage amplifiers
C. They are used near the end of the multi-stage amplifiers
D. They have a high power rating

Answer: Option B

Explanation:

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34. 

Which of the following cannot provide as much time interval accuracy as the oscilloscope but can capture and display eight or more signals simultaneously, something that scopes cannot do?

A. Logic analyzer
B. Digital oscilloscope
C. Frequency analyzer
D. Wave analyzer

Answer: Option A

Explanation:

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35. 

A DC voltage source is connected across a series R - L - C circuit. Under steady-state conditions, the applied DC voltage drops entirely across the

A. R only
B. C only
C. L only
D. R and L combination

Answer: Option B

Explanation:

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