Question 482Electricity & Electronics - Assistant Engineer

The correct answer is B) hand-operated field rheostat connected in series with the shunt field circuit. This is the simplest method of controlling the terminal voltage of a compound wound DC generator. By adjusting the resistance of the field rheostat in the shunt field circuit, the current through the shunt field winding can be varied, which in turn changes the strength of the magnetic field and allows for regulation of the terminal voltage. The other options are incorrect because: A) a carbon pile regulator is used for load regulation, not terminal voltage control; C) a balance coil is used to improve the load sharing between the series and shunt field windings, not for voltage regulation; and D) a separate exciter is a more complex solution for voltage regulation compared to a simple field rheostat.