Question

A dual-trace CRO has:

• A. one electron gun
• B. two electron guns
• C. one electron gun and one two pole switch
• D. two electron guns and one two pole switch

Hint:

A \textbf{dual-trace CRO} uses \textbf{two electron guns} to provide continuous and simultaneous display of two waveforms.

Answer 1

The Correct Option is B

A dual-trace Cathode Ray Oscilloscope (CRO) is designed to display two separate signals simultaneously.
To do this accurately and without switching, it requires two independent electron guns.
Each electron gun produces its own beam corresponding to a signal trace, allowing the device to display two waveforms concurrently.
This design contrasts with a dual-beam CRO, which might use one electron gun and a switching mechanism.
However, in a dual-trace CRO, using two electron guns offers better control, higher accuracy, and clearer separation of signal paths.
Therefore, a dual-trace CRO definitely has two electron guns and does not rely on a switching circuit to alternate traces.