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MCQs on Microprocessor

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01․ FPGA means
Field Programmable Gate Array
Forward Programmable Gate Array
Forward Parallel Gate Array
Field Parallel Gate Array

Field Programmable Gate Array (FPGA) is the re-configurable hardware, which consists of millions of logic gates which could be arranged according to the user's demand. They also have much higher frequency compared to micro controllers.
02․ Which language could be used for programming an FPGA.
Verilog
VHDL
Both A and B
None

Verilog and VHDL are the hardware description languages that are used for the programming of FPGAs. Both of these languages are case-insensitive in nature.
03․ What is mean by ALU
Arithmetic logic upgrade
Arithmetic logic unsigned
Arithmetic local unsigned
Arithmetic logic unit

It is used for arithmetic operations...
04․ Which one of the following is not a vectored interrupt?
TRAP.
INTR.
RST 7.5.
RST 3.

Here TRAP, INTR, RST 7.5 are vectored interrupts. But RST 3 is not a vectored interrupt.
05․ 8085 microprocessor has how many pins
30.
39.
40.
41.

Intel 8085 NMOS microprocessor is a 8 bit, 40 pins IC. It is a 40 pin I.C. package fabricated on a single LSI chip. The Intel 8085 uses a single + 5 V DC supply for its operation.Its clock speed is about 3 MHz. The clock cycle is 320 ns. It has 80 basic instructions and 246 opcodes.
06․ In 8085 microprocessor, the RST6 instruction transfer programme execution to following location
0030H.
0024H.
0048H.
0060H.

07․ HLT opcode means
load data to accumulator.
store result in memory.
load accumulator with contents of register.
end of program.

HLT opcode in 8085 microprocessor means end of program.
08․ In 8085 name/names of the 16 bit registers is/are
stack pointer.
program counter.
both A and B.
none of these.

Program counter (PC) and Stack pointer (SP) are basically used to hold 16 - bit memory addresses. PC stores the 16-bit memory address of the next instruction to be fetched. SP can be used to temporarily store the 16 - bit memory address as well as data. So PC and SP are 16-bit registers.
09․ What is SIM?
Select interrupt mask.
Sorting interrupt mask.
Set interrupt mask.
None of these.

SIM stands for set interrupt mask which is handling the interrupts in 8085 microprocessor.
10․ The ROM programmed during manufacturing process itself is called
MROM
PROM
EPROM
EEPROM

ROM’s are two types.
  1. Permanent ROMs
    • MROM
    • PROM
  2. Erasable ROMs
    • EPROM
    • EEPROM
The ROM programmed during manufacturing process itself is called MROM. Data is stored by the manufacturer during fabrication and user can not alter this data.
11․ 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.
12․ 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
13․ 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
14․ 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
15․ 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.
16․ 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
17․ Which one of the following circuits transmits two messages simultaneously in one direction
Duplex
Diplex
Simplex
Quadruplex

Diplex circuits transmits two messages simultaneously.
18․ 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.
19․ 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.
20․ 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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