The correct answer is D. Synchronous motor D.C. generator set.
A synchronous motor is an AC motor that runs at a constant speed, regardless of the load. This makes it ideal for use in a D.C. machines laboratory, where the speed of the motor must be precisely controlled. A D.C. generator is a device that converts mechanical energy into electrical energy. In a synchronous motor D.C. generator set, the synchronous motor is used to drive the D.C. generator. This provides a clean and reliable source of D.C. power for the laboratory.
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