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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

  star delta.
  both A and B.
None of these
  DOL.

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Electrical Machines
A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is

  13.5 A.
 11.5 A.
 23 A.
 27 A.

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Electrical Machines
Which of following DC motors will have percentage increase of input current for the same percentage increase in torque?

 Cummulative compound.
  Shunt.
 Differntical compound.
 Series.

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

 Wave winding.
 Lap winding.
 No wave and lap winding.
 Both wave and lap winding.

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = 4*ωm
 ωe = 2*ωm
 ωe = ωm
 ωe = 1/2*ωm

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 over compound generator
 series generators
 shunt generator
 both B and C

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