Electrical Machines
A DC Shunt Motor having shunt field resistance of 250 Ω and armature resistance of 0.5 Ω is connected to 250 V supply and load current of 21 A. What is the back emf generated ?

 210 V
 150 V.
 230 V.
 240 V.

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Electrical Machines
In a loaded DC generator, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 improve with fall of terminal voltage.
 deteriorate with rise in terminal voltage.
 improve with rise in terminal voltage.
 deteriorate with fall of terminal voltage.

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