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Electrical Machines

Electrical Machines
The starting resistance of DC motor is generally

 Infinitely large.
 around 500 ohms.
  Low.
 1000 ohms.

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Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

  thicker.
  thinner.
  sipper.
  rotor can not have any laminations.

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Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 Greater than 90o.
 less than 90o.
 90o.
 0o.

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 200Ω
 100Ω
 50Ω
 10Ω

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Electrical Machines
What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.

 20 volts.
 40 volts.
 10 volts.
 30 volts.

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Electrical Machines
The direction of rotation of a DC motor can be determined by

 Ampere's law.
 Lenz's law.
  Fleming's left hand rule.
 Fleming's right hand rule.

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