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A current transformer should always have its secondary ___ when not connected to an external load.

A 2-phase system is a power supply consisting of two phases that are ___° out of phase.

A ___ transformer is one of the transformers in a T-connected transformer bank and is provided with a 50% voltage tap.

For autotransformers, when the current is 9 A or more, the overcurrent protection device is allowed to be rated at not more than ___% of the full-load current.

In North America, virtually all power systems now operate at 60 Hz.

When determining the proper wiring connections to develop a particular voltage, a technician requires knowledge of the ___.

An interconnected wye connection is a method of wiring transformers where two separate windings are interconnected on each phase in a linear fashion.

In some older steel mills, some ___ Hz motors are still used to move the hot bar from the rolling dies and send it to the shear.

A(n) ___ connection is a method of wiring transformers where the windings are divided over several legs of the transformer core.

A Scott connection uses a tap at the 70% point on the main transformer and a tap at the 90% point on the teaser transformer.