In a DC series motor, if the armature current is halved, the torque of the motor will be equal to(a) 100% of the previous value(b) 50% of the previous value(c) 25% of the previous value(d) 10% of the previous valueThis question was posed to me in final exam.I'm obligated to ask this question of Operating Characteristics of DC Series Motor -1 in portion Characteristics of DC Motors of DC Machines

In a DC series motor, if the armature current is halved, the torque of

1.	In a DC series motor, if the armature current is halved, the torque of the motor will be equal to(a) 100% of the previous value(b) 50% of the previous value(c) 25% of the previous value(d) 10% of the previous valueThis question was posed to me in final exam.I'm obligated to ask this question of Operating Characteristics of DC Series Motor -1 in portion Characteristics of DC Motors of DC Machines
Answer» Right choice is (c) 25% of the PREVIOUS VALUE Explanation: TORQUE in the case of linear magnetization of DC series motor is directly proportional to SQUARE of the armature current. So, armature current is made 1/2th of the original value, then torque will be 1/4th of the original value.

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