A CRO can display _________ A. AC signals B. DC signals C. Both

a-cro-can-display-a-ac-signals-b-dc-signals-c-both

A CRO can display _________

A. AC signals

B. DC signals

C. Both AC and DC signals

D. Time-invariant signals

The question was posed to me in a job interview.

This is a very interesting question from Advanced Problems on CRT and CRO in section Oscilloscopes of Electrical Measurements

Right option is C. Both AC and DC signals

To elaborate: A Cathode Ray Oscilloscope cannot measure or display Time invariant signals. However, it can measure both AC and DC signals.