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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 11 of 13

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Q101.
The priority level of an interrupt of 8051 for which SI(serial interrupt) interrupt is programmed is

a.

level 0

b.

level 1

c.

level 0 or level 1

d.

None of the mentioned

Discuss
Answer: (b).level 1
Q102.
The minimum duration of the active low interrupt pulse for being sensed without being lost must be

a.

greater than one machine cycle

b.

equal to one machine cycle

c.

greater than 2 machine cycles

d.

equal to 2 machine cycles

Discuss
Answer: (b).equal to one machine cycle
Q103.
If two interrupts, of higher priority and lower priority occur simultaneously, then the service provided is for

a.

interrupt of lower priority

b.

interrupt of higher priority

c.

lower and higher priority interrupts

d.

none of the mentioned

Discuss
Answer: (b).interrupt of higher priority
Q104.
For an interrupt to be guaranteed served it should have duration of

a.

one machine cycle

b.

three machine cycles

c.

two machine cycles

d.

four machine cycles

Discuss
Answer: (c).two machine cycles
Q105.
The service to an interrupt will be delayed if it appears during the execution of

a.

RETI instruction

b.

Instruction that writes to IE register

c.

Instruction that writes to IP register

d.

All of the mentioned

Discuss
Answer: (d).All of the mentioned
Q106.
The serial communication is

a.

cheaper communication

b.

requires less number of conductors

c.

slow process of communication

d.

all of the mentioned

Discuss
Answer: (d).all of the mentioned
Q107.
The serial communication is used for

a.

short distance communication

b.

long distance communication

c.

short and long distance communication

d.

communication for a certain range of distance

Discuss
Answer: (b).long distance communication
Q108.
The mcs 51 architecture supports

a.

serial transmission and reception

b.

simultaneous transmission and reception

c.

transmission and reception of data using serial communication interface

d.

all of the mentioned

Discuss
Answer: (d).all of the mentioned
Q109.
The number of bits transmitted or received per second is defined as

a.

transmission rate

b.

reception rate

c.

transceiver rate

d.

baud rate

Discuss
Answer: (d).baud rate
Q110.
The task of converting the byte into serial form and transmitting it bit by bit along with start, stop and parity bits is carried out by

a.

reception unit

b.

serial communication unit

c.

transmission unit

d.

all of the mentioned

Discuss
Answer: (c).transmission unit
Page 11 of 13

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