DGVCL Exam Paper (11-12-2011)
In which of the following motors, the stator and rotor magnetic fields rotate at the same speed?

Induction motor
Universal motor
Reluctance motor
Synchronous motor

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DGVCL Exam Paper (11-12-2011)
DC series motors are best suited for traction work because

Torque and speed are proportional to the square of the armature current
Torque and speed are inversely proportional to the square of the armature current
Its torque is proportional to the square of the armature current and speed is inversely proportional to torque
Its torque is proportional to the square of the armature current and speed is directional proporational to torque

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