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Electrical Machines

Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 3
 √3
 1/3
 1/√3

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Electrical Machines
Breadth factor is defined as the ratio of

 emf with concentrated winding to emf with distributed winding.
 emf with distributed winding to emf with concentrated winding.
None of these
 both 1 and 2.

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Electrical Machines
What type of connection is made in between the inter-pole and the field winding?

 Parallel.
 None of the options.
  Series.
 Compound.

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Electrical Machines
A DC generator without commutator is a

 induction motor
 DC motor
 DC generator
 AC generator

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Electrical Machines
Which of the following generators are used in arc welding?

 series generators
 shunt generators
 cumulative compound generators
 differential compound generators

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Electrical Machines
A 4 pole DC generator runs at 750 rpm and generate an emf of 240 V. The armature is wave wound and has 792 conductors. If the total flux from each pole is 0.0145 Wb. What is the leakage co-efficient?

 1.4.
  1.2.
 1.5.
 1.8.

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