Correct option is B
A megger is an instrument that measures the insulation resistance of electrical systems in ohms.
Explanation:
· A megger is a portable instrument that measures insulation resistance.
· It can be battery operated or mechanically operated.
· It works on the principle of electromagnetic induction.
· It has a built-in high voltage source.
· It can measure resistances of several hundred or even thousands of megaohms.
· It is used to measure the insulation resistance of electrical machinery or systems.
· It is used to measure the insulation resistance of cable insulation, between motor windings, and in transformer windings.
