Two channels of a CRO are fed with two signals. In the X-Y mode, an ellipse with major axis aligned along the Y axis is observed. The following inference can be made from this
1
Two signals are periodic with same frequency but different phase and amplitude
2
Two signals are periodic with same frequency and amplitude but different phase
3
Two signals are periodic with same frequency and phase but different amplitude
4
Two signals are periodic with same amplitude but different frequency