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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 0 Hz
 25 Hz
 100 Hz
 50 Hz

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Electrical Machines
In above question, the output power delivered by generator G1 and G2 will be

 9.6 kW, 12 kW.
 5.7 kW, 8.7 kW.
  6.3 kW, 9.3 kW.
 9.3 kW, 9.3 kW.

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Electrical Machines
The condition for maximum running torque is

 0.707 lagging
 unity
 R = S.X
 0.5 lagging
 zero

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Electrical Machines
Silicon content in steel lamination is kept within 5% as it

 increases hysteresis loss.
 Increases cost.
 makes the material brittle.
All 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?

 1.8.
 1.4.
 1.5.
  1.2.

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Electrical Machines
Copper brushes in DC machine are used

 where high voltage and low current.
 where low voltage and high currents are involved.
 in both of above cases.
None of these

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