The most common control transformers have ___ primary coils and one secondary coil.
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A(n) ___ device must be provided to cause the main switch or…
A(n) ___ device must be provided to cause the main switch or common overcurrent protection device to open if the load reaches 125% of its rating.
A ___ current transformer is a special type of window curren…
A ___ current transformer is a special type of window current transformer with a solid bar placed permanently through the window.
Common applications in the use of autotransformers are ___.
Common applications in the use of autotransformers are ___.
The phase difference between the primary and secondary in a…
The phase difference between the primary and secondary in a control transformer is ___°.
Autotransformer reduced-voltage starting provides the highes…
Autotransformer reduced-voltage starting provides the highest possible starting ___ per ampere of line current.
Variable-speed drives use current transformers to monitor th…
Variable-speed drives use current transformers to monitor the outgoing current.
A ___ transformer is a continuously adjustable autotransform…
A ___ transformer is a continuously adjustable autotransformer consisting of a single layer of wire wound on a toroidal core, and a carbon brush that traverses this winding.
A ___ transformer is a transformer that is used to step down…
A ___ transformer is a transformer that is used to step down the voltage to the controls and control devices of a circuit or machine.
The line voltage can be calculated by ___ the measured volta…
The line voltage can be calculated by ___ the measured voltage and the turns ratio of the transformer.