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ISRO EC 2019: Digital Circuits & Microprocessor Booster Quiz 5

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Question 1

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

Question 2

In a 8085 microprocessor system with memory mapped I/O

Question 3

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

Question 4

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

Question 5

Expression for

in figure, where

and

are Boolean variables is

Question 6

A digital board has a unipolar square clock of 250MHz. If the clock on the board at all places should have all the harmonic components which have more than 10 % of DC value, the board has to be designed for at least

Question 7

For the 8055 assembly language program given below, the content of the accumulator after the execution of the program is
3000 MVI A, 45
3002 MOV B, A
3003 STC
3004 CMC
3005 RAR
3006 XRA B

Question 8

The following instruction have been executed by an 8085 processor.
Address (Hex) Instruction
6000 MVI A, 78 H
6002 RLC
6003 JC 70 00 H
The next address will be

Question 9

The greatest negative number which can be stored in a 8 – bit register using 2’s complement arithmetic is

Question 10

The Boolean expression for the output of the logic circuit shown in the figure is

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ESE & GATE EC Digital Circuits

Dec 24ESE & GATE EC