3) Which type of relay is used to protect the damage of equipment during under and over voltage fault ?

current sensing relay

under current relay

voltage sensing relay

latching relay

Answer is:

voltage sensing relay

Under current relay

Voltage sensing relay

Latching relay

Current sensing relay

Answer is:

Impulse relay

Dry reed relay

Thermal relay

Free relay

Answer is:

placing asbestos between the contacts

providing a shading coil near the tip of the magnetic field

cleaning the dirty particles over the coil and contacts

applying varnish over the coil core

Answer is:

eliminate the chattering noise in relay

protect the equipment from fluctuating voltage

provide the gap between the layers of magnetic core

increase the strength of the magnetic field

Answer is: