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Electrical Machines

Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 60°.
 120°.
 90°.
 30°.

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Electrical Machines
In 3 - Φ induction motor some times copper bars are placed deep in the rotor to

  improve efficiency.
  improve starting torque.
  reduce copper loss.
  improve power factor.

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 increase.
 either of these.
None of these
 decrease.

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

 3 - phase fault.
  line to ground fault.
 3 - phase to ground fault.
 line to line fault.

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Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Nr
 Zero
 Ns
 S.Ns

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Electrical Machines
In a dc machine, 1. physically, the brush axis is along the direct axis 2. physically, the brush axis is along the interpolar axis 3. schematically, the brush axis is along the direct axis 4. schematically, the brush axis is along the quadrature axis 5. armaturemmf is directed along the brush axis From these, the correct statements are

 1 , 3, 5
 2, 4, 5
 2, 3, 5
 1, 4,5

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