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The range of the exciter voltage in the field coils of a synchronous generator or motor varies widely depending on the design, size, and specific application of the machine. Generally, exciter voltages can range from a few volts to several thousand volts. Small machines may have exciter voltages in the range of 50V to 300V, while larger machines, especially those used in power generation, might have exciter voltages from 200V to over 1000V. Ultimately, the specific range depends on the machine’s requirements for generating the necessary magnetic flux in the rotor to induce the correct voltage in the stator (for generators) or to maintain the correct speed/torque characteristics (for motors). For precise applications or machines, consulting the manufacturer’s specifications or documentation is recommended.
Answer: d
Explanation: The minimum value of the exciter voltage across the field coils is 50 V. The maximum value of the exciter voltage is 400 V.