Electrical Cables

The resistance of the conductor The inductance of conductors The capacitances of insulated conductors All above parameters Hysteresis losses only Hysteresis and leakage losses only Hysteresis, leakage and copper losses only Hysteresis, leakage, copper and friction losses Becomes one-fourth Becomes one-half Becomes double Remains unchanged Presence of moisture Working temperature Time of application of the voltage All of the above Avoid excessive sheath losses Make it flexible Either of the above None of the above Absence of harmonics Nonexistence of any stability limit Smaller dielectric loss Absence of ripples Unsheathed cables Armoured PVC sheathed cables All of the above Varnished cambric Vulcanised rubber Impregnated paper None of the above Steel tape Galvanised steel wire Any of the above None of the above To minimise temperature stresses To avoid being unearthed easily due to removal of soil To minimise the effect of shocks and vibrations due to gassing vehicles, etc. For all of the above reasons Sheath Insulator Surface of the conductor Core of the conductor Low permittivity High resistivity High dielectric strength All of the above Varnished cambric Rubber Paper Any of the above 5 ohms 20 ohms 50 ohms 100 ohms The increase in length of the insulation The decrease in the length of the insulation Either (A) or (B) None of the above More perfect impregnation Smaller overall size No ionisation, oxidation and formation of voids All of the above 2 cm 10 cm 50 cm 400 cm Easy maintenance Low cost Can be used in congested areas Can be used in high voltage circuits Minimize the stress Avoid the requirement of good insulation Provide proper stress distribution None of the above Hessian cloth Jute Any of the above None of the above