ISCET Digital Electronics Principles 4

Question 1

In a Karnaugh map, what do adjacent cells that are grouped together share?

Accepted Answer

The same output value and differ in only one variable

Answer

Adjacent K-map cells differ in exactly one variable, allowing that variable to be eliminated when grouping for simplification.

Question 2

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

Accepted Answer

EPROM

Answer

EPROM (Erasable Programmable ROM) is erased by exposing its quartz window to UV light for several minutes.

Question 3

A multiplexer (MUX) with 4 select lines can route how many input channels?

Accepted Answer

16

Answer

A MUX with n select lines supports 2ⁿ inputs; 4 select lines → 2⁴ = 16 input channels.

Question 4

What is propagation delay in a logic gate?

Accepted Answer

Time for the output to settle after an input change

Answer

Propagation delay (tpd) is the time interval between a change at the input and the resulting change at the output of a gate.

Question 5

Which Boolean identity is known as the 'absorption' law?

Accepted Answer

A + AB = A

Answer

The absorption law states A + AB = A, because A already 'absorbs' the term AB.

(ISCET) International Society of Certified Electronics Technicians Practice Test