Download Aptitude Crack
img not found img not found

Alternating Current and Voltage

Q1: 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°.

ANS:A - Wave A leads wave B by 15°.

Get the power factor of both waves.
Wave A = 45 degrees.
Wave B = 60 degrees.

P.F. (Wave A) = cos (45) = 0.707.
P.F (Wave B) = cos (60) = 0.5.

The implication of this is that Wave A is already at the peak, while Wave B is about the get the peak. Thus, Wave A is leading Wave B by 15 degrees.



img not found
img

For help Students Orientation
Mcqs Questions

One stop destination for examination, preparation, recruitment, and more. Specially designed online test to solve all your preparation worries. Go wherever you want to and practice whenever you want, using the online test platform.