Electric Machine Design - EEE Questions and Answers

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Which of the following is a paramagnetic material ?

A.

Palladium

B.

Lead

C.

Pure iron

D.

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

A.

(yb + 1)/ Î¼

B.

(yb + 1 )

C.

(yb - 1)/ Î¼

D.

(yb - 1)

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

A.

+ 2

B.

- 2

C.

± 1

D.

± 2

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Above Curie point

A.

a ferromagnetic material becomes paramagnetic

B.

a ferrite becomes an insulator

C.

a insulating material becomes a ferrite

D.

a diamagnetic material, becomes a paramagnetic material.

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

A.

Electrical energy to mechanical energy only

B.

Mechanical energy to electrical energy only

C.

All of the mentioned

D.

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?

A.

Magnetic field

B.

Electric field

C.

Magnetic field or Electric field

D.

None of the mentioned

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

A.

50,000

B.

25,000

C.

10,000

D.

40,000