railway RRB JE (CBT I + CBT II) Mock Test 2024 Power Systems Transmission and Distribution Overhead Insulators
Overheating of an insulator is due to ________ between one metal part to the other. This causes unequal expansion of porcelain, thus shattering the insulator with cracking.
1
porosity
2
mechanical stress
3
short-circuit
4
flash-over