jCorona usually occurs when the electrostatic stress in air around the conductor exceeds?

Related Mcqs:

In aluminium conductors, steel core is provided to____________?

A. compensate for skin effect B. neutralise proximity effect C. reduce line inductance D. increase the tensile strength...

For which of the following equipment current rating is not necessary?

A. Circuit breakers B. Isolators C. Load break switch D. Circuit breakers and load break switches...

The skin effect of a conductor will reduce as the__________?

A. resistivity of conductor material increases B. permeability of conductor material increases C. diameter increases D. frequency increases...

If variable part of annual cost on account of interest and depreciation on the capital outlay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the corresponding size of conductor will be most economical. This statement is known as___________________?

A. Kelvin’s law B. Ohm’s law C. Kirchhoffs law D. Faraday’s law E. none of the above...

Which of the following D.C. distribution system is the simplest and lowest in first cost ?

A. Radial system B. Ring system C. Inter-connected system D. None of the above...