Overheating of an insulator is caused by __________K from one metal part to another. This causes uneven expansion of porcelain, thus shattering the insulation along with cracking.
A. Mechanical stress
B. Short-circuit
C. Porosity
D. Flash-over
Answer:D
Overheating of an insulator is caused by __________K from one metal part to another. This causes uneven expansion of porcelain, thus shattering the insulation along with cracking.
A. Mechanical stress B. Short-circuit C. Porosity D. Flash-over