Question

Why is a delay line used in a CRO?

(a) to boost the signal

(b) to distort the signal

(c) to provide signal delay

(d) for stability

The question was posed to me in a job interview.

This question is from Simple Oscilloscope in section Oscilloscopes of Electrical Measurements

Answer 1

Correct choice is (c) to provide signal delay

The explanation: Delay line is used in a Cathode Ray Oscilloscope so as to delay the signal for some time. If the delay line is not used then a part of the signal is lost. A delay line circuit is used for this purpose.