Electrical Machines
A 3-phase slip ring induction motor is wound for 4 poles on stator and 6 poles on the rotor. When 3-phase balanced voltage source at 50 Hz is applied, it will run at

 zero speed
 750rpm
 1000 rpm
 1500 rpm

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Electrical Machines
The speed of a DC series motor is

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

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