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Electrical Machines

Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 18°
 36°
 30°
 72°

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Electrical Machines
The armature shaft must be able to withstand

 twisting strains due to transmission of torque.
 any unbalanced magnetic pull on the armature core.
 bending moment due to weight of the armature.
All of these

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 unity
 0.2 lead
 0.9 lag
 0.2 lag

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Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

  Shunt motor.
  Cumulative compound motor.
  Series motor.
  Differential compound motor.

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Electrical Machines
Which of the following motor is more expensive for same KW output rating ?

 DC Shunt Motor
 Synchronous motor.
 Induction motor.
 AC single phase motor.

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Electrical Machines
The torque angle, in a synchronous motor, is the angle between

  the supply voltage and the back emf.
None of these
  the rotating stator flux and rotor flux.
  magnetizing electric current and back emf.

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