CET Digital Electronics and Systems 3

Question 1

Which type of ADC offers the fastest conversion speed?

Accepted Answer

Flash (parallel)

Answer

A flash ADC uses a bank of 2^n–1 comparators to convert all bits simultaneously in a single step, making it the fastest architecture.

Question 2

What is the resolution of an 8-bit DAC with a full-scale output of 5 V?

Accepted Answer

19.53 mV

Answer

Resolution = Vfs / (2^n) = 5 V / 256 ≈ 19.53 mV per LSB step.

Question 3

In a synchronous counter, what is the main advantage over a ripple (asynchronous) counter?

Accepted Answer

All flip-flops clock simultaneously, eliminating ripple delays

Answer

Synchronous counters clock all flip-flops at the same time, so there is no cumulative propagation delay that causes counting glitches.

Question 4

A Karnaugh map is primarily used to:

Accepted Answer

Minimize Boolean expressions

Answer

A Karnaugh map (K-map) is a graphical method for simplifying Boolean algebra expressions to minimize gate count.

Question 5

Which number system uses 16 as its base and employs the digits 0–9 and letters A–F?

Accepted Answer

Hexadecimal

Answer

Hexadecimal (base-16) uses 0–9 and A–F to represent values 0–15, commonly used to express binary data compactly.

(CET) Certified Electronics Technician Practice Test