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Answer :

Sparking, is discouraged in a D.C. motor because commutator gets damaged.

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Answer : Sparking at the commutator of a D.C. motor may result in damage to commutator segments, damage to commutator insulation, increased power consumption.

Description : Sparking occurs when a load is switched off because the circuit has high?

Answer : Sparking occurs when a load is switched off because the circuit has high inductance.

Answer : For starting a D.C. motor a starter is required because it limits the starting current to a safe value.

Answer : In a universal motor, the most common cause of brush sparking is open armature winding, shorted armature winding, shorted field winding, high commutator mica.

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