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Electrical Machines

Electrical Machines
Equalizer rings are used in which of the followings?

 lap winding
 both 1 and 2
 wave winding
None of these

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Electrical Machines
Which of the following statements are correct ?

 The leakage reactance of the induction motor should be small.
None of these
 A small value of leakage reactance will increase the maximum power output of motor.
 Both 1 and 2.

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Electrical Machines
Two generators G1 and G2 are to be operated in parallel to deliver a total current of 60 A. Generator one has a terminal voltage of 280 V on no load and 240 V when supplying 40 A current. Similarly the second generator has a voltage of 300 V when on no load and 240 V when supplying of 50 A of current. The output voltage of each generator will be

  256.4 V.
 271.7 V.
 240 V.
 238.2 V.

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Electrical Machines
For a DC machine having P no of pole pairs Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for lap-winding ?

 PZL/4SP²
 PZL/4S
 PZL/ 4Sa
 PZL/4Sa²

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  synchronous motor.
  transformer with short-circuited secondary.
  repulsion motor type starting.
  capacitor run IM.

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 armature circuit
 both A and B
 none of above
 shunt field

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