ESE 2021 Technical Quiz || Switchgear and Protection -1

The factor which influences the arc de-ionization dominantly____

Harmonic restrain is used in transformers protection against

The resistance switching used in air blast breakers has the purpose of

A 220 kV system has line to ground capacitance 0.04 μF and inductance of 16 H. The value of resistance to be connected across the contacts to eliminate the restriking voltage is

Each of the next items consist of two statements, one labeled as ‘Statement (I)’ and other as Statement (II). You are to examine these two statements carefully and select the answers to these items using the codes gives below.

Statement (I): Lightning arrestor is used for the protection of equipment at the substations against lightning.

Statement (II): During normal operation, it offers high impedance between live and earth terminals but when lightning occurs, it provides low impedance and diverts those surge to ground.