Digital Circuit and Microprocessor MCQs

Question 1

A computer system has a 4K word cache organised in blocked associative manner with 4 blocks per set, 64 words per block. The number of bits in the SET and WORD fields of the main memory address formula is

Accepted Answer

4, 6

Answer

15, 4

Answer

6, 4

Answer

7, 2

Question 2

In a 8085 microprocessor system with memory mapped I/0

Accepted Answer

arithmetic and logic operations can be directly performed with the I/O data

Answer

I/O devices have 8-bit a addresses

Answer

I/O devices are accessed using IN and OUT instructions

Answer

there can be a maximum of 256 input devices and 256 output devices

Question 3

Choose the correct statement(s) from the following :

Accepted Answer

PROM contains a fixed AND array and programmable OR array

Answer

PROM contains a programmable AND array and a fixed OR array

Answer

PLA contains a fixed AND array and a programmable OR array

Answer

None of the above

Question 4

Choose the correct statement(s) from the following :

Accepted Answer

PROM contains a fixed AND array and a programmable OR array

Answer

PROM contains a programmable AND array and a fixed OR array

Answer

PLA contains a fixed AND array and a programmable OR array

Answer

PLA contains a programmable AND array and a programmable OR array.

Question 5

2's complement representationof a 16-bit number (one sign bit and 15 magnitude bits) is FFFI. Its magnitude in decimal representation is

Accepted Answer

32,767

Answer

0

Answer

1

Answer

65,767

Question 6

In a microprocessor, the resister which holds the address of the next instruction to be fetched is

Accepted Answer

Program Counter

Answer

Accumulator

Answer

Stack Pointer

Answer

Instructor Register

Question 7

In a microcomputer, WAIT states are used to

Accepted Answer

interface slow peripherals to the processor

Answer

make the processor wait during a DMA operation

Answer

make the processor wait during a power interrupt processing

Answer

make the processor wait during a power shutdown

Question 8

The decimal equivalent of the hexadecimal number E5 is

Accepted Answer

229

Answer

279

Answer

427

Answer

3000

Question 9

How many l's are present in the binary representation of 3 x 512 + 7 x 64+5 x 8 + 3?

Accepted Answer

9

Answer

8

Answer

10

Answer

11