BEE Digital Logic and Microprocessors 4

Question 1

Which logic family offers the lowest power consumption, making it ideal for battery-powered devices?

Accepted Answer

CMOS

Answer

CMOS logic consumes negligible static power because it draws current only during switching transitions.

Question 2

A 3-to-8 line decoder with active-low outputs has all inputs = 1. Which output line is asserted?

Accepted Answer

Output 7 (Y7)

Answer

Binary 111 = decimal 7, so Y7 is selected and pulled LOW (active-low) while all others remain HIGH.

Question 3

In pipelining, what is a 'pipeline hazard'?

Accepted Answer

A condition that prevents the next instruction from executing in the next cycle

Answer

Pipeline hazards are conditions (structural, data, or control) that prevent continuous instruction flow through the pipeline.

Question 4

What is the output of a 4-bit binary counter after 18 clock pulses, starting from 0000?

Accepted Answer

0010

Answer

A 4-bit counter cycles through 0–15 (modulo 16); 18 mod 16 = 2, which is 0010 in binary.

Question 5

Which type of ROM can be erased by exposing it to ultraviolet light?

Accepted Answer

EPROM

Answer

EPROM (Erasable Programmable ROM) is erased by exposing it to UV light through a quartz window.

BEE - Bachelor of Electrical Engineering Practice Test