GATE EC 2022:Digital Circuits Quiz 9

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Question 1

Find minimum no of 2 input NOR gate required to implement the following expression Y (A, B, C) = A̅BC + B̅C + ABC

• A3
• B11
• C0
• D9

Question 2

An 8085 processor has register contents and before the execution of instruction PUSH B. The value of and the content of the Stack Top after the execution of the instruction respectively are

• A5FFAH and 7 FH
• B5FF6H and 34H
• C5FF6H and 7 FH
• D5FF8H and 34H

Question 3

In a 8085 microprocessor system with memory mapped I/O

• Ai/O devices have 8 bit address
• BI/O devices are accessed using fN and OUT instructions
• CThere can be maximum 256 input and 256 output devices
• DArithmetic and logic operations can be directly performed with I/O data

Question 4

The content of the accumulator of 8085 microprocessor after execution of the following instructions will be
MVI A, A7h
ORA A
RLC

• AFFh
• B4Fh
• C3Fh
• DCEh

Question 5

A microprocessor with 12 – bit address bus will be able to access ___ kilobytes of memory.

• A0.4
• B2
• C10
• D4

Question 6

Expression for in figure, where and are Boolean variables is

• A
• B
• C
• D

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