What determines the length of the delay in an electrical delay line used in
oscilloscopes?

Question

Question

This question was previously asked in

RRB JE ECE 22 Apr 2025 Shift 2 CBT 2 Official Paper

Answer 1

The correct answer is: 1) The propagation speed of the signal in the line

In an electrical delay line used in oscilloscopes, the delay time is determined by:

The physical length of the delay line
The propagation speed of the signal through the line (which depends on the medium's properties, such as its dielectric constant and inductance/capacitance per unit length).

The resistance of the delay line → Affects signal attenuation, not the delay time.
The frequency of the input signal → The delay line is typically designed to be frequency-independent for a wide range of signals.
The speed of the electron beam → This relates to the CRT display, not the delay line.

Thus, the correct choice is 1) The propagation speed of the signal in the line.