Question

Why a dual slope oscilloscope is needed?

(a) to compare more than two voltages

(b) to measure the voltage

(c) to measure the current

(d) to measure the time

This question was addressed to me during an online interview.

The origin of the question is Dual Trace Oscilloscope topic in chapter Oscilloscopes of Electrical Measurements

Answer 1

The correct answer is (a) to compare more than two voltages

For explanation I would say: A dual trace oscilloscope is required for comparison for two or more voltages in the analysis and study of electronic circuits and systems.