Q.

Reducing the field current will give us

A. constant torque and variable power speed control
B. constant torque speed control
C. variable power speed control
D. constant power speed control
Answer» B. constant torque speed control
Explanation: as seen from speed torque characteristics, reducing field current will increase the speed of the motor above base value but power will remain same. thus, reducing armature voltage will give constant power speed control, with variable torque.
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