BEE FREE BEE Bachelor of Electrical Engineering Digital Logic and Microprocessors Questions and Answers 2

Question 1

What is the primary function of a multiplexer (MUX) in digital logic?

Accepted Answer

Selects one of many inputs and forwards it to a single output

Answer

A multiplexer selects one input from multiple sources based on select lines and routes it to a single output.

Question 2

In the 8085 microprocessor, which register pair is used as the default stack pointer?

Accepted Answer

SP register

Answer

The 8085 has a dedicated 16-bit Stack Pointer (SP) register that holds the address of the top of the stack.

Question 3

Which Boolean algebra theorem states that A + A·B = A?

Accepted Answer

Absorption theorem

Answer

The absorption theorem states that a variable ORed with its AND combination with another variable simplifies to just the original variable.

Question 4

What is the fan-out specification of a digital logic gate?

Accepted Answer

The maximum number of gate inputs that the output can drive

Answer

Fan-out specifies the maximum number of same-family gate inputs that an output can reliably drive while maintaining valid logic levels.

Question 5

Which addressing mode does the 8086 instruction MOV AX, [BX+SI+8] use?

Accepted Answer

Based indexed with displacement

Answer

This instruction uses the base register BX, index register SI, and an 8-bit displacement, combining all three into based indexed with displacement mode.

BEE - Bachelor of Electrical Engineering Practice Test

BEE - Bachelor of Electrical Engineering Practice Test

BEE FREE BEE Bachelor of Electrical Engineering Digital Logic and Microprocessors Questions and Answers 2