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Welcome to the 8051 Microcontroller MCQs Page

Dive deep into the fascinating world of 8051 Microcontroller with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of 8051 Microcontroller, a crucial aspect of Computer Architecture. In this section, you will encounter a diverse range of MCQs that cover various aspects of 8051 Microcontroller, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Computer Architecture.

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Check out the MCQs below to embark on an enriching journey through 8051 Microcontroller. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Computer Architecture.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of 8051 Microcontroller. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

8051 Microcontroller MCQs | Page 11 of 14

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Q101.
What is signal conditioning?

a.

to analyse any signal

b.

conversion or modification is referred to as conditioning

c.

conversion from analog to digital is signal conditioning

d.

conversion from digital to analog is signal conditioning

Discuss
Answer: (b).conversion or modification is referred to as conditioning
Q102.
What steps have to be followed for interfacing a sensor to a micro controller 8051?

a.

make the appropriate connections with the controller, ADC conversion, analyse the results

b.

make connections of 8051 with an ADC to convert analog voltage to digital one , send this digital value to the controller, analyse the results

c.

interface sensor with the MAX232, send now to micro controller, analyse the results

d.

none of the mentioned

Discuss
Answer: (b).make connections of 8051 with an ADC to convert analog voltage to digital one , send this digital value to the controller, analyse the results
Q103.
LM35 has how many pins?

a.

2

b.

1

c.

3

d.

4

Discuss
Answer: (c).3
Q104.
Why Vref is set of ADC0848 to 2.56 V if analog input is connected to the LM35?

a.

to set the step size of the sampled input

b.

to set the ground for the chip

c.

to provide supply to the chip

d.

all of the mentioned

Discuss
Answer: (a).to set the step size of the sampled input
Q105.
What is the function of 8255 chip?

a.

the ports of 8255 can act as the input/ output port for the micro controller

b.

it is a type of an external memory device that is being interfaced with the micro controller

c.

both of the mentioned

d.

none of the mentioned

Discuss
Answer: (c).both of the mentioned
Q106.
Which pins of a micro controller are directly connected with 8255?

a.

RD

b.

WR

c.

D0-D7

d.

all of the mentioned

Discuss
Answer: (d).all of the mentioned
Q107.
Find the control word for PA= out, PB= in, PCL=out, PCH=out (Mode0)?

a.

0xF0H

b.

0xF2H

c.

0xF4H

d.

0xFFH

Discuss
Answer: (b).0xF2H
Q108.
Which pins are used to select the ports and the control register?

a.

CS

b.

A1

c.

A0

d.

All of the mentioned

Discuss
Answer: (d).All of the mentioned
Q109.
What is the value of the control register when RESET button is set to zero?

a.

0x00H

b.

0xFFH

c.

0x11H

d.

value remains the same as was before the RESET button was set to zero

Discuss
Answer: (d).value remains the same as was before the RESET button was set to zero
Q110.
Why MOVX instruction is being used to access the ports of the 8255?

a.

because 8255 is used to access the memory mapped I/O

b.

because 8255 is used to access the external communication

c.

because 8255 is used to access the data transfer

d.

because 8255 is used to access the interfacing of LCD, motor etc.

Discuss
Answer: (a).because 8255 is used to access the memory mapped I/O
Page 11 of 14

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