A voltage of 6 cos(100πt) V is fed as y-input to a CRO. The waveform seen on the screen of the CRO is shown in the figure. The Y and X axes settings for the CRO are respectively

Voltage = 6 cos (100 π t)

V${}_{max}$ = 6 V.

From the waveform, number of vertical divisions = 3

Let each vertical division represents y V/div.

V${}_{max}$ = 6 V

⇒ 3 × y V/div = 6 V

⇒ y = 2 V/div

⇒ y – setting = 2v/div

ω = 2πf = 100 π

⇒ f = 50 Hz

$\Rightarrow \mathrm{Time}\mathrm{period}\left(\mathrm{T}\right)=\frac{1}{\mathrm{f}}=20ms$

Time period of one cycle = 20 ms

From the wave form, number of horizontal divisions to represent one full cycle = 10

$x-setting=\frac{20ms}{10div}=2ms/div$