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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.

A winding resistance test should be conducted with a(n) ___.