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

Higher switching speed

Answer

Simpler fabrication process

Answer

Better noise immunity at high frequencies

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

Increases voltage gain and decreases input impedance

Answer

Increases both voltage gain and input impedance

Answer

Decreases both voltage gain and input impedance

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

JK flip-flop

Answer

T flip-flop

Answer

SR latch

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

Loop gain must be greater than unity and phase shift must be 360 degrees

Answer

Loop gain must be less than unity and phase shift must be 180 degrees

Answer

Loop gain must equal zero and phase shift must be 90 degrees

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

1.25 V

Answer

0.5 V

Answer

2.5 V

Question 6

What is the purpose of a Schmitt trigger in digital circuits?

Accepted Answer

To convert analog signals to digital with hysteresis for noise immunity

Answer

To amplify weak digital signals

Answer

To store a single bit of data

Answer

To multiplex multiple input signals