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Electrical Machines

Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 16.
 8.
 32.
  4.

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Electrical Machines
Field weakening control method is used for the _________ ?

None of these
 below rated speed
 both A and B
 above rated speed

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Electrical Machines
The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that

 both Eb and Td are unchanged
 both Eb and Td are zero
 Eb is unchanged, but Td is zero
 Eb is zero, but Td is unchanged

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 +3.33%
 -3.33%
 -3%
 +3%

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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

 2, 4, 5
 2, 3, 5
 1 , 3, 5
 1, 4,5

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Electrical Machines
A DC compound motor has

 only series field winding.
 only shunt field winding.
 tertiary winding.
 both shunt and series field winding.

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