Electronics and Communication Engineering - Digital Electronics

31. 

In an op-amp a virtual ground is a ground for

A. voltage only
B. current only
C. both voltage and current
D. neither voltage nor current

Answer: Option A

Explanation:

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32. 

Assuming accumulator contain A 64 and the carry is set (1). What will register A and (CY) contain after SBI 0B7H?

A. 12 H, 0
B. 12 H, 1
C. DDH, 0
D. DDH, 1

Answer: Option D

Explanation:

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33. 

The Central Processing Unit (CPU) of the 16-processor system developed by hardware and software teams of C-DOT, Bangalore is configured around

A. Motorola 68020
B. Motorola 68040
C. Intel 80386
D. Intel 80486

Answer: Option A

Explanation:

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34. 

Figure shows an 8-bit LED display. A light circle means that a LED is ON (binary 1) and a dark circle means a LED is OFF (binary 0). What is the decimal equivalent of the binary number displayed?

A. 100
B. 121
C. 144
D. 172

Answer: Option D

Explanation:

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35. 

For NOR gate SR flip-flop, the 'no change' condition is

A. S = 0, R = 0
B. S = 1, R = 0
C. S = 0, R = 1
D. S = 1, R = 1

Answer: Option A

Explanation:

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