Electronics and Communication Engineering - Digital Electronics

41. 

A 3 bit binary adder can add

A. 2 bits
B. 2 bits
C. 3 bits
D. 8 bits

Answer: Option C

Explanation:

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42. 

The logic performed by the high-noise immunity logic circuit shown below is

A. OR
B. AND
C. NOR
D. NAND

Answer: Option D

Explanation:

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43. 

An 8156 has A15 connected to its CE input. A14 to A8 are unconnected, and AD7 to AC0 are connected.Ignoring shadows, the port addresses

A. 80 H
B. 85 H
C. 82 H, 83 H
D. 80 H to 85 H

Answer: Option D

Explanation:

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44. 

In 8085 microprocessor, what is the length of IR (instruction register)?

A. 6 bits
B. 8 bits
C. 12 bits
D. 16 bits

Answer: Option B

Explanation:

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45. 

A sequence detector is required to give a logical output of 1 whenever the sequence 1011 is detected in the incoming pulse stream. Minimum number of flip-flops needed to built the sequence detector is

A. 4
B. 3
C. 1
D. 2

Answer: Option B

Explanation:

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