Q. The ratio of starting torque to full load torque is least in

A
DC series motor
B
DC shunt motor
C
DC compound motor
D
None of the above
Solution:

From torque current characteristic, we get that torque at no load or starting torque is equal to zero. As load increases, speed decreases and armature current increases so as torque also increases linearly, if effect of armature reaction is neglected.

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