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

Converts analog signals to digital

Answer

Stores data in flip-flops

Answer

Amplifies digital signals

Question 2

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

Accepted Answer

SP register

Answer

HL pair

Answer

BC pair

Answer

DE pair

Question 3

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

Accepted Answer

Absorption theorem

Answer

De Morgan's theorem

Answer

Consensus theorem

Answer

Idempotent theorem

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

The propagation delay of the gate

Answer

The power consumption at maximum frequency

Answer

The noise margin of the output

Question 5

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

Accepted Answer

Based indexed with displacement

Answer

Direct addressing

Answer

Register indirect

Answer

Immediate addressing

Question 6

What is the purpose of the carry look-ahead technique in adder circuits?

Accepted Answer

To reduce propagation delay by computing carry signals in parallel

Answer

To increase the number of bits that can be added

Answer

To reduce the number of gates required

Answer

To simplify the circuit layout