Electric Machine Design - EEE Questions and Answers

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Which of the following is a paramagnetic material ?

Palladium

Lead

Pure iron

All of the above

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If yb is the back pitch and u is the no. of coil sides per slot, then split coils can be avoided if the following quantity is an integer

(yb + 1)/ Î¼

(yb + 1 )

(yb - 1)/ Î¼

(yb - 1)

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For a simplex lap winding, the winding pitch is equal to

+ 2

- 2

± 1

± 2

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Above Curie point

a ferromagnetic material becomes paramagnetic

a ferrite becomes an insulator

a insulating material becomes a ferrite

a diamagnetic material, becomes a paramagnetic material.

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An electro-mechanical energy conversion device is one which converts _______

Electrical energy to mechanical energy only

Mechanical energy to electrical energy only

All of the mentioned

None of the mentioned

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What is the coupling field used between the electrical and mechanical systems in an energy conversion devices?

Magnetic field

Electric field

Magnetic field or Electric field

None of the mentioned

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The energy storing capacity of magnetic field is about ________ times greater than that of electric field?

50,000

25,000

10,000

40,000