SSC JE Electrical Engineering 2015 Paper

Question : 137 of 199

Marks: +1, -0

A lissajous pattern on an oscilloscope has 5 horizontal tangencies and 2 vertical tangencies.
The frequency of the horizontal input is 100 Hz.
The frequency of the vertical input will be:

400 Hz
2500 Hz
4000 Hz
5000 Hz

Validate

Solution:

Lissajous pattern with different ratio is

\f_y/ \f_x= h_x/h_y

\f_y = 100/2× S = 2500 Hz

\f_y

= unknown frequency

\f_x

= known frequency

h_x

= tangencies at 'x' axis

h_y

= tangencies at 'y' x is

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