Electrical Machines
Which of the following DC Motor uses 4-point starter?

 DC shunt motor with field weaking control.
 DC series motor.
 DC compound motor.
 DC shunt motor with armature resistance.

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Electrical Machines
The speed of a DC series motor is

 Inversely proportional to the armature current.
 Proportional to the armature current.
 Proportional to field current.
 Proportional to the square of the armature current.

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