Electrical Machines
Armature of DC machine is made of

 silicon steel.
 non-ferrous material.
 insulating material.
 conducting material.

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Electrical Machines
A DC shunt generator builds up to a voltage of 220 V at no load while running at its rated speed. If the speed of the generator is raised by 25% kepping the circuit conditions unaltered, then the Voltage to which the machine would build up will

 increase to value lying between 220 V and 1.25 times 220 V
 increase to a value greater than 1.25 times 220 V
 not change and remain at 220 V
 increase to 1.25 times 220 V

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