railway RRB JE (CBT I + CBT II) Mock Test 2024 Electrical and Electronics Measurements Cathode Ray Oscilloscope
When two sinusoidal voltages of equal frequency but with 90° phase displacement are applied to the horizontal and vertical plates of a CRO, then the pattern appearing on the screen is:
1
a circle
2
a straight line
3
a parabola
4
an ellipse