Give examples of circuit protecting device apart from fuse, circuit beaker, relays, lighting arrestor, switch gears.

Justin

• May 5th, 2013

A zener diode, for smaller amounts of voltage regulation.

gorakh anna pandhre

• Apr 18th, 2013

Opoto-isolaters

Answer Question  Select Best Answer

What causes transformer humming?

Krishna Kant Gupta

• Mar 13th, 2012

Humming sound in the transformer is due to the stray losses in the transformer due to the leakage flux.this flux produce eddy currents in the nearby conductive areas.The humming sound is the result of...

bittu123

 Profile Answers by bittu123 Questions by bittu123

• Nov 9th, 2011

Humming sound caused by magnetostriction phenomenon. Magnetostriction is change in physical dimension of material because of change in magnetic field.

Since, there is varying magnetic field in transformer causes vibration of core in gap available due to bad insulation. and starts soud hum

Answer Question  Select Best Answer