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___ present in the insulating oil forms conducting paths on nonconducting parts such as bushing shanks and insulated leads.

High levels of gases such as nitrogen or oxygen in insulating liquid can indicate the presence of ___.

When the transformer cannot be isolated during an insulation power factor test, a ___ tester gives more reliable results.

NFFI transformers contain a liquid that is flammable.

Pressurized ___ is often used as a blanket over the liquid in liquid-filled transformers.

___ current is a very small current that flows through insulation between conductors or from conductor to ground.

Heat exchangers on large transformers have ___ on one side and air or water on the other side.

This course covers plants. 

At each position when a load tap changer is rotated, the technician should check that a complete contact surface and tension exist at each position.

A(n) ___ test is used to measure the resistance of the transformer winding to identify loose connections or damaged coils.