Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
Cables used in automobiles and arc welding sets are usually
Paper insulated
VIR
High pressure gas insulated
Oil filled
VIR
Cables used in automobiles and arc welding sets require high flexibility to withstand repeated bending and constant movement. VIR (Vulcanized Indian Rubber) insulation, often applied over multi-stranded conductors, provides the necessary pliability, mechanical toughness, and electrical resistance for these specific applications.
Cables used in automobiles and arc welding sets require high flexibility to withstand repeated bending and constant movement. VIR (Vulcanized Indian Rubber) insulation, often applied over multi-stranded conductors, provides the necessary pliability, mechanical toughness, and electrical resistance for these specific applications.
R=╧БALтАЛ тАФ Relation defining resistance, though flexibility is the primary design factor here
FтИЭn тАФ Flexibility increases with the number of strands n
In arc welding and automotive electrical systems, cables are subjected to frequent vibrations and physical manipulation. Using a large number of fine-wire strands increases flexibility (FlexibilityтИЭdn1тАЛ, where d is strand diameter). VIR insulation acts as a resilient sheath that prevents cracking during these maneuvers while maintaining a high dielectric strength.
VIR insulation stands for Vulcanized Indian Rubber.
Welding cables require fine-stranded conductors for maximum flexibility.
Automotive cables must resist oil, grease, and mechanical abrasion.
Tough rubber sheathing is used to withstand harsh operational environments.
High flexibility and ease of handling
Good resistance to mechanical shocks and vibrations
Cost-effective for flexible applications
Rubber can degrade over time when exposed to extreme ozone or sunlight
Heavy compared to modern synthetic materials like EPR or CSP
Arc welding electrode holders
Automotive battery leads
Portable power tools
Automobile wiring harnesses
VIR (Vulcanized Indian Rubber) is a specific historical type of rubber insulation used in India; in modern contexts, it is often replaced by CSP (Chlorosulphonated Polyethylene) or EPR (Ethylene Propylene Rubber) which offer better thermal stability.
Paper insulation is exclusively for high-voltage underground power transmission where the cable remains stationary.
B is correct тАФ VIR insulation is preferred for automobile and arc welding cables because it offers the high flexibility and mechanical durability required for cables that are frequently moved.
Always relate insulation choice to the mechanical environment; static cables use paper/oil/gas for insulation, while mobile cables require elastomeric (rubber/polymer) materials.