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Electrical Machines

Electrical Machines
A DC generator beyond critical resistance will generate

 maximum voltage.
 maximum current.
 maximum power.
 no voltage.

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

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

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Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 20KVA
 0KVA
 4KVA
 16KVA

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ 1/V
 T ∝ 1/V²
 T ∝ V
 T∝ V²

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Electrical Machines
A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be

 3.5+j5.8 ohms
 3.05+j5.08 ohms
 53+j85 ohms
 8+j13 ohms

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Electrical Machines
The use of higher flux density in the transformer design

 increases the weigh per KVA
 reduces the weigh per KVA
None of these
 has no relation with the weight of transformer

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