Microprocessors And Microcontrollers MCQ Questions & Answers

Microprocessors And Microcontrollers MCQ Questions & Answers | ECE

Learn Microprocessors And Microcontrollers MCQ questions & answers are available for a Electronics and Communications Engineering(ECE) students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Microprocessors And Microcontrollers MCQ question is the important chapter for a Electronics and Communications Engineering(ECE) and GATE students. Page-1 section-2

Which of the following instructions of an 8086 microprocessor uses the contents of a CX register as a counter?
1. LOCK
2. LOOP
3. ROTATE
Select the correct answer using the options given below:

A) Only 1 and 2 B) Only 1 and 3 C) Only 2 and 3 D) 1, 2 and 3

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Answer & Solution

Answer: Option C

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What is the capacity of internal RAM in 8051 microcontroller?

A) 128 bytes B) 256 bytes C) 4 KB D) 8 KB

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Answer & Solution

Answer: Option A

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Which of the following is not a characteristic of transparent DMA mode of I/O operation?

A) The external logic steals cycles from the CPU B) The normal rate of execution is slowed down C) Only one word can be transferred at a time D) Data is transferred to/from memory directly

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Answer & Solution

Answer: Option B

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Which of the following peripherals provide I/O facilities?
1. 8279
2. 8155
3. 8259
4. 8255

A) 1, 2 B) 2, 3 C) 3, 4 D) 2, 4

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Answer & Solution

Answer: Option D

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Determine the contents of register AL in 8086 after the following instructions have executed
MOV BL, 8 CH
MOV AL, 7 EH
ADD AL, BL

A) O2H-carry flag set B) OAH-carry flag set C) O1H- carry flag not set D) OFH - carry flag set

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Answer & Solution

Answer: Option B

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The interface chip used for data transmission between 8086 and a 16 bit ADC is

A) 8259 B) 8255 C) 8253 D) 8251

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Answer & Solution

Answer: Option B

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As compared to 16 bit microprocessor, 8 bit microprocessors are limited in
1. Speed
2. Directly addressable memory
3. Data handling capability

A) 1 and 2 only B) 2 and 3 only C) 1 and 3 only D) 1, 2 and 3

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Answer & Solution

Answer: Option D

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Which of following is used to reset entire interrupt structure in 8051 microcontroller?

A) RETI B) NOP C) HLT D) MOV

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Answer & Solution

Answer: Option A

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In 8051, Match the following

Branch Instruction	Addressing	Jumping distance
a. LJMP	1. Relative	W. 11 bits
b. AJMP	2. Indirect	X. 16 bits
c. SJMP	3. Direct	Y. 8 bits
d. JMP@A+DPTR	4. Direct	Z. 16 bits

A) a 3 X, b 4 W, c 1 Y, d 2 Z B) a 2 W, b 3 X, c 4 Y, d 1 Z C) a 4 Z, b 3 Y, c 2 X, d 1 W D) a 1 W, b 2 X, c 3 Y, d 4 Z

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Answer & Solution

Answer: Option A

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In 8085, if the clock frequency is 5 MHz, the time required to execute an instruction of 18 T states is

A) 3.0 µs B) 3.6 µs C) 4.0 µs D) 6.0 µs

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Answer & Solution

Answer: Option B

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