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Answer :

D.C. Series motor is generally preferred for cranes and hoists.

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Answer : Cumulative compound D.C. motor is preferred for elevators.

Answer : The starting resistance of a D.C. motor is generally low.

Answer : Cumulatively compounded D.C. motor will be suitable along with flywheel for intermittent light and heavy loads.

Description : Describe the reason of using dc series motor for electric trains.

Answer : Electric trains require an inverse torque speed characteristics for proper operation. That is a higher torque is required at start (when speed is nil or low) and as the train picks up ... torque - speed characteristics of DC series motors match, these motors are suitable for electric trains