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Electrical Machines

Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.1.
  0.5.
  0.05.
  1.0.

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Electrical Machines
The field divertor resistance for a DC series motor is of order of

 50 Ω
 0.1 Ω
 100 Ω
 10 Ω

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Electrical Machines
Two identical loss less series motors connected in series across a dc supply voltage, runs at speed of N1 and N2, then ratio of their output power is

 N1 : N2.
 1 : 1.
 none.
 N12 : N22.

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Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

  65.8 Nm.
 27.73 Nm .
 74 Nm.
 38.5 Nm.

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Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 0o.
 180o.
 dependent upon the load.
 90o.

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Electrical Machines
Swinburne test is conducted under which of the following condition?

 half load
 no load
 full load
 any of the above

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