MCQs on Microprocessor

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01․ A field programmable ROM is called
MROM
PROM
FROM
FPROM

ROM’s are two types.
  1. Permanent ROM’s a) MROM b) PROM
  2. Erasable ROM’s a) EPROM b) EEPROM
In PROM data is stored by user. Only one time programmable and reprogramming is not possible.
02․ A combinational PLD with a fixed AND array and a programmable OR array is called a
PLD
PROM
PAL
PLA

ROM – Fixed AND array and fixed OR array PROM – Fixed AND array and Programmable OR array PAL – Programmable AND array and fixed OR array PLA – Programmable AND array and programmable OR array
03․ A combinational PLD with a programmable AND array and a fixed OR array is called a
PLD
PROM
PAL
PLA

ROM – Fixed AND array and fixed OR array PROM – Fixed AND array and Programmable OR array PAL – Programmable AND array and fixed OR array PLA – Programmable AND array and programmable OR array
04․ A combinational PLD with a programmable AND array and a programmable OR array is called a
PLD
PROM
PAL
PLA

ROM – Fixed AND array and fixed OR array PROM – Fixed AND array and Programmable OR array PAL – Programmable AND array and fixed OR array PLA – Programmable AND array and programmable OR array
05․ A mask programmed ROM is
programmed at the time of fabrication
programmed by the user
erasable and programmable
erasable electrically

The ROM programmed during manufacturing process itself is called MROM. Data is stored by the manufacturer during fabrication and user can not alter the data. In PROM data is stored by user. Only one time programmable and reprogramming is not possible. In EPROM erasing is done using UV light and programming is through electrical.
06․ The length of bus cycle in 8086/8088 is four clock cycles, T1, T2, T3, T4 and an indeterminate number of wait state clock cycles denoted by Tw. The wait states are always inserted between
T1 & T2
T2 & T3
T3 & T4
T4 & T1

The wait states are always inserted between T3 & T4
07․ Which one of the following circuits transmits two messages simultaneously in one direction
Duplex
Diplex
Simplex
Quadruplex

Diplex circuits transmits two messages simultaneously.
08․ The number of output pins in 8085 microprocessors are
27.
40.
21.
19.

In 8085 microprocessor there are 40 pins out of which 27 are output pins and rest 13 are including clock input, power supply and other input pins.
09․ The program counter in a 8085 micro-processor is a 16-bit register, because
It counts 16-bits at a time
There are 16 address lines
It facilitates the user storing 16-bit data temporarily
It has to fetch two 8-bit data at a time

Program counter stores the address of next instruction to be fetched. AS 8085 address is of 16-bit so program counter has to be of 16-bit.
10․ A microprocessor is ALU
and control unit on a single chip.
and memory on a single chip.
register unit and I/O device on a single chip.
register unit and control unit on a single chip.

A microprocessor is a semiconductor component designed by using VLSI technology and it contains ALU, Control unit (CU) and registers of a CPU in a single package.
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