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Electrical Machines

Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor copper loss?

 60W
 40W
 100W
 80W

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Electrical Machines
A lap wound 4 pole dc motor has 460 conductors. Find the number of parallel paths between the conductors?

  data provided is insufficient.
  4.
  2.
 6.

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Electrical Machines
A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is

 27 A.
 11.5 A.
  13.5 A.
 23 A.

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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
 increase by 100%
 increase by 200%
 remain unaltered

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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 lap-winding ?

 PZL/4S
 PZL/4Sa²
 PZL/4SP²
 PZL/ 4Sa

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Electrical Machines
which of the following type of brush and their application is/are correct

 carbon brush → normal ratings
All of these
 copper graphite → low voltage high current density
 electro graphite → large ratings

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