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Electrical Machines

Electrical Machines
Flux density under leading pole tips in case of generator will

 increase
 either increase or decrease
 decrease
None of these

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Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

 Ward Leonard control.
 rheostatic control.
 none of above.
 any of above method.

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Electrical Machines
A lap wound 4 pole dc motor has 460 conductors. Find the number of parallel paths between the conductors?

  2.
  data provided is insufficient.
 6.
  4.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.

  400 Amp.
 800 Amp.
  0.5 Amp.
 320 Amp.

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Electrical Machines
Which type of single phase induction motor is having the highest power factor at full load ?

 Capacitor start.
 Shaded pole type.
  Capacitor run type.
 Split phase type.

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Electrical Machines
There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase

 any of the two machines
 machine A
 none of these
 machine B

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