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Electrical Machines

Electrical Machines
A DC generator beyond critical resistance will generate

 maximum power.
 maximum current.
 maximum voltage.
 no voltage.

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Electrical Machines
Air core transformer as compared to iron core transformer, has

 more magnetic core loss.
 less magnetic core loss.
  more copper loss.
  no magnetic core loss.

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

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

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Electrical Machines
Which of the following pairs is/are correct?

 open slot----- leakage flux is less
All of these
 closed slot----- leakage flux is high
 semi closed slot-----leakage flux is moderate

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Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?

 2166.67V, 270 rpm.
 541.67V, 250 rpm.
 2166.67V, 230 rpm.
 541.67V, 200 rpm.

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Electrical Machines
In shapers and slotters which motor are preferred?

  Synchronous motor.
  Squirrel cage IM.
  Double cage motor.
  Slip ring IM.

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