18.a. A mechanical connection between machines is NOT needed for loading back tests of A. induction machines. B. d-c series-wound machines. C. synchronous machines. D. d-c shunt-wound machines. 18.b. The machine part which does not have any iron loss is the A. a-c motor stator. B. transformer core. C. d-c motor armature. D. alternator rotor.

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Single Phase Transformer

A single-phase transformer is a type of power transformer. It is an electrical device that accepts converts the single phase alternating power into single phase alternating power. In this power conversion the voltage is stepped up or down. If the voltage is stepped up, the current will be stepped down and if the voltage is stepped down, the current will be stepped up.