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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  EbIa2.
  EbIa.
  none of these.
  EIa.

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Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

 1500 Volt.
 1600 Volt.
  0 Volt.
 2000 Volt.

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Electrical Machines
Slot wedges in a dc machine is made up of

 silicon steel.
 cast iron.
 fibre.
 mild steel.

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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

 1/Ia
 Ia2
 Ia
 I/Ia2

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Electrical Machines
Lamination of core are generally made of

 stainless steel.
 carbon.
 cast iron.
 silicon steel.

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Electrical Machines
Transformer cooling and insulating oil must be of

 low BDV.
  low viscosity.
 high viscosity.
 low resistivity.

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