In which of the following motor, ratio of starting torque to full-load torque will be least?(a) DC series motors(b) DC shunt motors(c) DC compound motors(d) Synchronous motorsThis question was posed to me during an interview.Origin of the question is Operating Characteristics of DC Shunt Motor -1 in section Characteristics of DC Motors of DC Machines

In which of the following motor, ratio of starting torque to full-load

1.	In which of the following motor, ratio of starting torque to full-load torque will be least?(a) DC series motors(b) DC shunt motors(c) DC compound motors(d) Synchronous motorsThis question was posed to me during an interview.Origin of the question is Operating Characteristics of DC Shunt Motor -1 in section Characteristics of DC Motors of DC Machines
Answer» The CORRECT choice is (b) DC shunt motors Explanation: 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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