BEE BEE Bachelor of Electrical Engineering Analog and Digital Electronics Questions and Answers 2

Question 1

What is the primary advantage of using CMOS logic over TTL logic in digital circuits?

Accepted Answer

Lower static power consumption

Answer

CMOS logic consumes negligible static power because one of the complementary transistors is always off, drawing almost zero current in steady state.

Question 2

In a common-emitter amplifier, what is the effect of adding an unbypassed emitter resistor?

Accepted Answer

Decreases voltage gain and increases input impedance

Answer

An unbypassed emitter resistor introduces negative feedback, which reduces voltage gain but increases input impedance and improves stability.

Question 3

Which flip-flop is commonly used to eliminate metastability issues in clock domain crossing designs?

Accepted Answer

Two-stage synchronizer using D flip-flops

Answer

A two-stage synchronizer with back-to-back D flip-flops allows the potentially metastable output of the first stage to settle before being sampled by the second.

Question 4

What does the Barkhausen criterion state for sustained oscillation in a feedback circuit?

Accepted Answer

Loop gain must equal unity and total phase shift must be a multiple of 360 degrees

Answer

The Barkhausen criterion requires the loop gain magnitude to be exactly one and the total phase shift around the loop to be 0° or a multiple of 360° for sustained oscillations.

Question 5

In a 4-bit binary weighted DAC with a reference voltage of 10V, what is the resolution (smallest voltage step)?

Accepted Answer

0.625 V

Answer

Resolution equals Vref divided by 2^n, so 10V / 16 = 0.625V for a 4-bit DAC.

BEE - Bachelor of Electrical Engineering Practice Test

BEE - Bachelor of Electrical Engineering Practice Test

BEE BEE Bachelor of Electrical Engineering Analog and Digital Electronics Questions and Answers 2