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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - star
 Star - star
 Star - delta
 Delta - delta

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Electrical Machines
If the excitation is critical, the power factor of the alternator is

 unity power factor.
 leading power factor.
 lagging power factor.
None of these

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Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/S
 1-S
 1/(1-S)
 S

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Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be

  470 rpm.
 450 rpm.
 540 rpm.
  240 rpm.

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Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

 3Fmax.
 (1/2)Fmax.
  (3/2)Fmax.
 Fmax.

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Electrical Machines
For pure resistive load what is the armature reaction?

All of these
 cross magnetization
 demagnetization
 magnetization

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