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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

  both A and B.
None of these
  DOL.
  star delta.

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Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

  0.905.
 1.1.
  0.05.
 20.

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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

 400 V.
 200 V.
 100 V.
 800 V.

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Electrical Machines
In case of IM the torque is

  directly proportional to slip.
  directly proportional to slip2.
  inversely proportional to √slip.
  inversely proportional to slip.

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Electrical Machines
A DC series motor has which of the following characteristics?

 Has a poor torque.
 Has its field winding consinting of thick wire and less no of turns.
 Can be started easily without load.
 Has a almost constant speed.

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Electrical Machines
A 240 V DC series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 5.7 ohms.
 2.2 ohms.
 6 ohms.
 1.9 ohms.

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