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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 13 of 14

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Q121.
Name the read only registers are present in the DS12887?

a.

register A, register B

b.

register B, register C

c.

register C, register D

d.

register D, register A

Discuss
Answer: (c).register C, register D
Q122.
What is the supply that a DS12887 consumes even when the power is switched off?

a.

Lithium ion battery

b.

Lead battery

c.

Both of the mentioned

d.

None of the mentioned

Discuss
Answer: (a).Lithium ion battery
Q123.
What is the principle on which electromagnetic relays operate?

a.

electromagnetic induction

b.

motor control

c.

switching

d.

none of the mentioned

Discuss
Answer: (a).electromagnetic induction
Q124.
What are DPDT relays?

a.

Single pole, single throw

b.

Single pole, double throw

c.

Double pole, double throw

d.

None of the mentioned

Discuss
Answer: (c).Double pole, double throw
Q125.
Why do we need a ULN2803 in driving a relay?

a.

for switching a motor

b.

for increasing the current limit in the relays

c.

for increasing the power

d.

for decreasing the current limit in the relays

Discuss
Answer: (b).for increasing the current limit in the relays
Q126.
Why are solid relays advantageous over electromagnetic relays?

a.

they need zero voltage circuit

b.

they need less current to be energised

c.

they need less voltage to be energised

d.

none of the mentioned

Discuss
Answer: (b).they need less current to be energised
Q127.
What are optoisolators?

a.

it is a driver

b.

it is a thing isolated from the entire world

c.

it is a device that can be used as an electromagnetic relay without a driver

d.

none of the mentioned

Discuss
Answer: (c).it is a device that can be used as an electromagnetic relay without a driver
Q128.
How can we control the speed of a stepper motor?

a.

by controlling its switching rate

b.

by controlling its torque

c.

by controlling its wave drive 4 step sequence

d.

cant be controlled

Discuss
Answer: (a).by controlling its switching rate
Q129.
Which of the following can be a unit for torque?

a.

kg/m^2

b.

ounce-inch

c.

kg-m^3

d.

g/m

Discuss
Answer: (b).ounce-inch
Q130.
The RPM rating given for the DC motor is for?

a.

no-loaded

b.

loaded

c.

none of the mentioned

d.

all of the mentioned

Discuss
Answer: (a).no-loaded
Page 13 of 14

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