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8086 Architecture MCQs

Practice 8086 Architecture MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1
Microprocessors & Microcontrollers8086 Architecture

The 8086 instruction prefetch queue has a capacity of?

  • A2 bytes
  • B4 bytes
  • C6 bytes
  • D8 bytes
Report an error
Correct Answer: C. 6 bytes
Explanation: The 8086 BIU can prefetch up to six instruction bytes into its queue.
Reference: Standard microprocessors and microcontrollers: 8086 architecture
Question 2
Microprocessors & Microcontrollers8086 Architecture

The Intel 8086 is fundamentally a?

  • A16-bit microprocessor
  • B8-bit microcontroller
  • C4-bit processor
  • D32-bit DSP
Report an error
Correct Answer: A. 16-bit microprocessor
Explanation: The 8086 has a 16-bit ALU and 16-bit external data bus and is classified as a 16-bit microprocessor.
Reference: Standard microprocessors and microcontrollers: 8086 architecture
Question 6
Microprocessors & Microcontrollers8086 Architecture

The 8086 Bus Interface Unit is responsible for functions including?

  • AInstruction fetching and physical address generation
  • BOnly arithmetic multiplication
  • COnly flag comparisons
  • DOnly interrupt masking
Report an error
Correct Answer: A. Instruction fetching and physical address generation
Explanation: The BIU handles bus operations, instruction fetching, segment registers and physical-address generation.
Reference: Standard microprocessors and microcontrollers: 8086 architecture