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Electrical Machines

Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 50
 1
 10
 100

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Electrical Machines
A 4 pole dynamo with wave wound armature has 51 slots contains 20 conductors in each slot. If induced emf 357 Volts and speed is 8500 rpm, flux per pole will be

 1.4 mWb.
 3.5 mWb.
  1.2 mWb.
 2.7 mWb.

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Electrical Machines
Iron loss in a transformer mainly occurs in

 transformer insulating oil.
 steel core in transformer.
 iron made tank of transformer.
 winding of transformer.

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Electrical Machines
DC machine is a

 none of above are correct.
 conduction machine.
 convection machine.
 both are correct.

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Electrical Machines
In a three phase slip-ring induction motor, brushes are connected to

  3 - Φ AC supply.
  external star-connected resistors.
  DC supply.
  equalizing coils.

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Electrical Machines
A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will

 remain unaltered.
 decrease.
 become execessively high.
 increase.

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