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Electrical Machines

Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 460 V.
 230 V.
 200 V.
 115 V.

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Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 18°
 60°
 20°
 30°

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Electrical Machines
Iron loss in a transformer mainly occurs in

 steel core in transformer.
 transformer insulating oil.
 iron made tank of transformer.
 winding of transformer.

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Electrical Machines
Direction of rotation of DC motor is reversed by

 Adding resistance to field circuit.
 Reversing supply connection.
 Interchanging armature and field connection.
 Reversing armature connection or field connection.

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 I/Ia2
 Ia2
 1/Ia
 Ia

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

 shunt motor.
 AC synchronous motor.
 cummulative compound motor.
  series motor.

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