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Electrical Machines

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

 fibre.
 mild steel.
 silicon steel.
 cast iron.

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Electrical Machines
What type of connection is made in between the inter-pole and the field winding?

 Compound.
  Series.
 Parallel.
 None of the options.

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Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 140 V
 120 V
 240 V
 175 V

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Electrical Machines
Resistance commutation is used generally in case of

 DC machines bellow 5 kW.
None of these
 DC machines above 10 kW.
  fractional kW DC machines.

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  induction generator torque.
  DC motor torque.
  synchronous motor torque.
  induction motor torque.

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Electrical Machines
What does the use the of height flux density value in transformer design lead to?

  Decrease in weight/KVA.
 Increase in weight/KVA.
 Reduced copper loss.
 Reduced iron loss.

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