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Electrical Machines

Electrical Machines
In DC machine torque is proportional to which of the following?

 armature current(Ia)
 flux(φ)
 both A and B
None of these

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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?

  1.2.
 1.8.
 1.4.
 1.5.

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Electrical Machines
The efficiency of a transformer is mainly dependent on

 dielectric losses.
 core losses.
 stray losses.
 copper losses.

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Electrical Machines
Armature coil is short circuited by brushes when it lies

  in any of above positions.
  along neutral axis.
  along field axis.
  in none of above positions.

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Electrical Machines
Which of the following motor has the highest power factor at full load?

 Capacitor run
 Capacitor start
 Resistance split phase
 Shaded pole

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Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 0 V
 1 V
 2 V
 4 V

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