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Electrical Machines

Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 10V
 200V
 20V
 100V

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.

  400 Amp.
  0.5 Amp.
 320 Amp.
 800 Amp.

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

 shunt generators
 series generators
 differential compound generators
 cumulative compound generators

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

 Increases.
 Remains unchanged.
  Decreases.
 Oscillates around the rated speed.

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

 Capacitor start motor
 Resistance split phase motor
 Capacitor start capacitor run motor
All of these

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Electrical Machines
A simple method of increasing the voltage of a DC generator is to

 increase the number of turns in field coil.
 increase the number of turns in armature coil.
 increase the source frequency.
  increase the speed of shaft rotation.

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