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Electrical Machines

Electrical Machines
Which of the following represents the pitch factor?

 sin (α/2)
 Cos α²
 Cos α
 Cos (α/2)

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Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 starters
 commutator
 field winding
 armature winding

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Electrical Machines
Commutator in DC generator is used for

 reduce losses
 convert AC armature current in to DC
 collecting of current
 increase efficiency

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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/4S
 PZL/4Sp²
 PZL/4Sa²
 PZL/ 4Sa

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Electrical Machines
Which of the following motors has negative speed regulation?

 Series motors.
 Shunt motors.
 Differential compound motors.
 Both B and C.

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Electrical Machines
In above question, the output power delivered by generator G1 and G2 will be

  6.3 kW, 9.3 kW.
 9.3 kW, 9.3 kW.
 9.6 kW, 12 kW.
 5.7 kW, 8.7 kW.

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