Question

If the shape shown on the CRO screen is


then the value of $\frac{f_x}{f_y}$ will be

• A. 0.77
• B. 1.28
• C. 1.33
• D. 0.75

Answer 1

The correct option is A 0.77

The frequency ratio of two signals is given by

$\frac{Numberofhorizontaltangencies}{Numberofverticaltangencies}=\frac{f_y}{f_x}$

$\frac{f_y}{f_x}=\frac{4+\frac{1}{2}}{3+\frac{1}{2}}=\frac{9}{7}$

$\Rightarrow$ $\frac{f_x}{f_y}=\frac{7}{9}$

$\Rightarrow$ $\frac{f_x}{f_y}=0.77$