Question

Sine wave A has a positive-going zero crossing at $45$. Sine wave B has a positive-going zero crossing at $60$. Which of the following statements is true?

• A. Wave A leads wave B by $15$.
• B. Wave A lags wave B by $15$.
• C. Wave A leads wave B by $105$.
• D. Wave A lags wave B by $105$.

Answer 1

The correct option is A Wave A leads wave B by $15$.

A

Here the sinewave A has a positive going zero crossing at 45 and B has a positive going zero crossing at 60. So, A crosses zero first and B crosses after 15. So the sinewave A leads wave B by 15.