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Electrical Machines

Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 50
 10
 1
 100

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Electrical Machines
The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively?

 3200 W and 2500 W
 1600 W and 1250 W
 1600 W and 5000 W
 3200 W and 5200 W

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Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 25 W.
 36 W.
 28 W.
 30 W.

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Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 60°
 30°
 45°
 10°

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

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

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Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 increase
 decrease
None of these
 either increase or decrease

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