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Welcome to the Microcontroller 8051 MCQs Page

Dive deep into the fascinating world of Microcontroller 8051 with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Microcontroller 8051, a crucial aspect of Microprocessor. In this section, you will encounter a diverse range of MCQs that cover various aspects of Microcontroller 8051, 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 Microprocessor.

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

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

Microcontroller 8051 MCQs | Page 10 of 13

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Q91.
The step that is involved in the procedure of memory interfacing with 8051 is

a.

data bus is connected to data lines of memory chips

b.

PSEN(active low) is connected to OE(active low) of EPROM chips

c.

writing address map of memory chip in bit form

d.

all of the mentioned

Discuss
Answer: (d).all of the mentioned
Q92.
The device that is used for deriving chip select signals is

a.

Logic gates

b.

Multiplexers

c.

PLAs and EPROMs

d.

All of the mentioned

Discuss
Answer: (d).All of the mentioned
Q93.
For deriving chip selects of isolated memory or IO devices, the gates that are traditionally used are

a.

NOR and NAND

b.

NAND and NOT

c.

NOT and NOR

d.

AND, OR and NOT

Discuss
Answer: (b).NAND and NOT
Q94.
The current that is required for a LED for an appropriate glow is

a.

6-8 mA

b.

4-6 mA

c.

8-10 mA

d.

10-12 mA

Discuss
Answer: (c).8-10 mA
Q95.
The maximum current that can be sinked totally by all the ports of 8051 is

a.

61 mA

b.

81 mA

c.

91 mA

d.

71 mA

Discuss
Answer: (d).71 mA
Q96.
The number of LEDs that can be connected to a port of 8051, if all are expected to glow simultaneously is

a.

6

b.

8

c.

10

d.

12

Discuss
Answer: (b).8
Q97.
Which is true in interfacing 7 segment code display?

a.

transmitted by second port

b.

display is selected by third port

c.

display is selected by second port

d.

none of the mentioned

Discuss
Answer: (c).display is selected by second port
Q98.
After the display is selected by second port, then the digit (LED) glows for a duration of

a.

5 msec

b.

10 msec

c.

2 msec

d.

6 msec

Discuss
Answer: (a).5 msec
Q99.
The number of scans of the complete 8-digit display that can be carried out in one second is

a.

15

b.

25

c.

35

d.

55

Discuss
Answer: (b).25
Q100.
To convert its current output into a voltage, the DAC 0808 is connected with

a.

Transistor(BJT) externally

b.

FET externally

c.

OPAMP externally

d.

OPAMP internally

Discuss
Answer: (c).OPAMP externally
Page 10 of 13

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