How often do power surges occur?
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Description : For protection of rotating machines against lightning surges _______ is used.  (1) lightning arrester (2) capacitor (3) combination of lightning arrester and capacitor (4) lightning conductor and arrester

Answer : For protection of rotating machines against lightning surges combination of lightning arrester and capacitor is used. 

Description : How do you measure power factor?

Answer : P= 1.83*V*I*COS@ where P is power           V is voltage            I is current           COS @ is P.F COS@= P/(1.83*V*I)  in other way cos @ = true power/apparent power

Description : Why do we need to correct power factor?

Description : What can you do to prevent a power surge?

Answer : By applying various power quality monitoring devices and using telecommunication technique .