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Electrical Machines

Electrical Machines
Total core loss is also called as -------------?

 Hysteresis loss
 Copper loss
 Magnetic loss
 Eddy current loss

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

  restoring torque.
 mechanical rotatory system.
 synchronizing power co efficient.
 damping torque.

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Electrical Machines
The induction motor shaft is made of

  mild steel.
  cast iron.
  aluminium.
  stainless steel.

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Electrical Machines
Two identical loss less series motors connected in series across a dc supply voltage, runs at speed of N1 and N2, then ratio of their output power is

 1 : 1.
 none.
 N12 : N22.
 N1 : N2.

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Electrical Machines
Compensating winding is placed in the

 pole shoe
 armature core
All of these
 main field

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Electrical Machines
A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is

 1, 2, 3
 2, 3, 4, 5
 2, 3 ,5
 2, 3, 4

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