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

Question 1

A digital circuit with four inputs must produce a HIGH output only when an odd number of its inputs are HIGH. Which of the following single logic gates is most suitable for this application?

Accepted Answer

A 4-input XOR gate

Answer

A 4-input AND gate

Answer

A 4-input OR gate

Answer

A 4-input NAND gate

Question 2

Which of the following statements best describes the primary operational difference between a D latch and a D flip-flop?

Accepted Answer

A latch is level-triggered, meaning its output can change whenever the enable/clock signal is active, whereas a flip-flop is edge-triggered, changing its output only on a specific transition of the clock signal.

Answer

A flip-flop has a feedback path to store data, while a latch does not.

Answer

A latch is constructed from NAND gates, while a flip-flop is constructed from NOR gates.

Answer

A flip-flop can store two bits of data, while a latch can only store one bit.

Question 3

What is the primary architectural difference that distinguishes a Von Neumann architecture from a Harvard architecture in microprocessors?

Accepted Answer

The organization of memory and buses for instructions and data.

Answer

The use of a RISC versus a CISC instruction set.

Answer

The number of processing cores available.

Answer

The speed of the system clock.

Question 4

An 8-bit digital system uses the two's complement method to represent signed integers. What is the correct binary representation for the decimal value -100?

Accepted Answer

10011100

Answer

01100100

Answer

10011011

Answer

11100100

Question 5

Which of the following is a primary advantage of using CMOS (Complementary Metal-Oxide-Semiconductor) logic gates over TTL (Transistor-Transistor Logic) gates?

Accepted Answer

Much lower static power dissipation.

Answer

Significantly faster switching speed in all applications.

Answer

Greater immunity to electrostatic discharge (ESD).

Answer

Simpler fabrication process.

Question 6

A microprocessor-based system is designed such that peripheral devices are accessed using the same instructions (e.g., MOV, LOAD, STORE) and occupy the same address space as the main memory. What is this I/O handling technique called?

Accepted Answer

Memory-mapped I/O

Answer

Port-mapped I/O

Answer

Direct Memory Access (DMA)

Answer

Interrupt-driven I/O

A digital circuit with four inputs must produce a HIGH output only when an odd number of its inputs are HIGH.Which of the following single logic gates is most suitable for this application?

A digital circuit with four inputs must produce a HIGH output only when an odd number of its inputs are HIGH.
Which of the following single logic gates is most suitable for this application?