The two signals S1 and S2, shown in figure, are applied to Y and X deflection plates of an oscilloscope.

The waveform displayed on the screen is

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GATE EE 2014 Official Paper: Shift 3

Option 1 :

CT 1: Ratio and Proportion

2846

10 Questions
16 Marks
30 Mins

S_{1} → applied to y → vertical plates

S_{2} → applied to x → horizontal plates

Observing the waveform, we conclude that

For 0 < t < T/2, 0 < S_{1} < 1 and S_{2} = 1

And at t = T/2, S_{1} = S_{2} = 0

For T/2 < t < T, 0 > S_{1} > - 1 and S_{2} = 1

We can represent this data in tabular form

t |
(x, y) |

0 |
(+1, 0) |

T/4 |
(+1, +1) |

T/2 |
(+1, 0) and (-1, 0) |

3T/4 |
(-1, -1) |

T |
(-1, 0) and (+1, 0) |

Thus the waveform displayed on the CRO screen is,