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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 GNA
 MNA
None of these
 either GNA or MNA

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Electrical Machines
The armature shaft must be able to withstand

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

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

  4 / 5.
 6 / 7.
 2 / 3.
 5 / 6.

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Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 66.3%
 33.3%
 50%
 57.7%

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Electrical Machines
An induction motor has a rotor resistance of 0.002 Ω / phase. If the resistance is increased to 0.004 Ω / phase then the maximum torque will

 reduced to half
 remain unaltered
 increase by 200%
 increase by 100%

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Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

 1600 Volt.
 2000 Volt.
  0 Volt.
 1500 Volt.

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