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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.3.
  1.
 0.7.
  0.54.

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Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 30°
 36°
 72°
 18°

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Electrical Machines
If a DC Series motor is connected across an AC supply it will

 run at normal speed.
 not run.
 burn.
 run at lower speed.

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Electrical Machines
For a DC machine having P no of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for simple wave-winding ?

 PZL/4Sa²
 PZL/4Sp²
 PZL/ 4Sa
 PZL/4S

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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.
 Fmax.
  (3/2)Fmax.
 (1/2)Fmax.

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Electrical Machines
The heat generated in the transformer is dissipated mainly by

 radiation.
 conduction.
  convection.
All of these

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