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Electrical Machines

Electrical Machines
Eddy current loss will depends on

 Thickness
 Frequency
 Flux density
All of these

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Electrical Machines
For successful parallel operation of two single phase transformers, the most essential condition is that their

 KVA ratings are equal
 turn- ratios are exactly equal
 polarities are properly connected
 percentage impedances are equal

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Electrical Machines
Swinburne's test is applicable to

 DC Shunt motor.
 DC compound motor.
 DC shunt and level Compound motor.
 DC series motor.

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Electrical Machines
In DC machines shape of net flux density is?

 saddle shape
 flat tapped or trapezoidal
 sine wave
 peaky in nature

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Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings

 V/2, I and P/2
 V/2, I/2 and P/4
 V, I/2 and P/2
 V, I and P

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Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 4 ang 1
 4 and 2
 2 and 2
 2 and 1

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MORE MCQ ON Electrical Machines

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