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Variable control transformers can be used with buck-boost transformers to create a(n) ___ regulation system.

Control transformers for HVAC systems are usually rated 120 V or 240 V on the primary and ___ V on the secondary.

Ground connections should be inspected regularly for ___ connections.

A(n) ___ test is performed to measure the electrical resistance of insulation between two conductors or between a conductor and ground.

A(n) ___ is a device used to shunt a voltage spike to ground or from line to line.

Guarding can be accomplished by ___.

___ transformers contain no oil and are cooled by circulating air.

Transformers have a noise rating based on the ___ rating.

If the rated primary current of the transformer is less than ___ A, the rating of the OCPD is permitted to be set at not more than 167% of the rated primary current.

A metal oxygen variable (MOV) is a nonlinear resistor that can change resistance with changes in current.