Question: A d.c. shunt motor is excited from an alternating power frequency voltage source. Its brush-axis is rotated by an angle a from the geometrical

A d.c. shunt motor is excited from an alternating power frequency voltage source. Its brush-axis is rotated

A d.c. shunt motor is excited from an alternating power frequency voltage source. Its brush-axis is rotated by an angle a from the geometrical neutral axis. The torque developed will be proportional to which one of the following? (a) sin a (b) cos a (c) tan a (d) cos 2x

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