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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

 speed.
  voltage.
  speed and voltage.
  load.

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Electrical Machines
Lap winding is prefered for which type of machines?

 high current and high voltage
 high current and low voltage
 low current and high voltage
 low current and low voltage

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

 somewhat less than 230 V
 somewhat more than 230 V
 6 V
 230 V

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Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 1
 2
 6
 4

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

  4.
 32.
 8.
 16.

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Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then

 Ia increases and ωm decreses
 both armature current Ia and speed ωm increase
 both decrese
 Ia remains constant but ωm increase

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