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Electrical Machines

Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 2 V
 1 V
 4 V
 0 V

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 50 KVA
 100 KVA
 83.33 KVA
 123.3 KVA

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Electrical Machines
Breadth factor is defined as the ratio of

 emf with concentrated winding to emf with distributed winding.
 both 1 and 2.
None of these
 emf with distributed winding to emf with concentrated winding.

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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 commutation
 electromechanical energy conversion
 development of torque
 generation of voltage

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Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

 0.16 pu.
  0.02 pu.
  0.08 pu.
 0.01 pu.

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Electrical Machines
The flux is maximum in the following part of a DC motor:

 under leading pole tip.
 under trailing pole tip.
 pole core.
 under the interpole.

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