Electric Machine Design PART 2
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Attempt Free Electric Machine Design PART 2 Here. Read The Important Electrical MCQ From Below.
(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.Get Answer
17. For a simplex wave winding, the winding pitch is equal to
(A) + 2
(B) – 2
(C) ± 1
(D) ± 2.
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Electric Machine Design PART 2
18. 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)/ μ
(B) (yb + 1 )
(C) (yb – 1)/ μ
(D) (yb – 1)
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19. Which of the following is a paramagnetic material ?
(A) Palladium
(B) Lead
(C) Pure iron
(D) All of the above.
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20. Which of the following is a ferromagnetic material ?
(A) Pure iron
(B) Lead
(C) Bismuth
(D) Water.
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Electric Machine Design PART 2
21. For simplex wave and lap windings, the back pitch yb and front pitch yf are as follows:
(A) yb is odd, yf is even
(B) yb is even, yfis odd
(C) both yb and yf are odd
(D) both yb and yf are even.
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22. All of the following are ferromagnetic materials EXCEPT
(A) Nickel
(S) Bismuth
(C) Silicon
(D) Mild steel.
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23. Diamagnetic: Copper:: Ferromagnetic:
(A) Iron
(B) Lead
(C) Air
(D) Water.
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Electric Machine Design PART 2
24. Diamagnetic : Ferromagnetic ::
(A) Copper: Silver
(B) Air: Water
(C) Iron: Steel
(D) Lead: Cobalt.
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25. Which of the following gives materials in order of increasing values of permeability ?
(A) Water, Iron. Copper, Silver
(B) Water, Air, Pure iron. Permalloy
(C) Cobalt, Aluminium, Copper, Silver
(D) Silicon iron. Palladium, Lead, Silver.
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26. By adding silicon to ferromagnetic , materials
(A) electrical resistivity increases and also magnetic permeability increases
(B) electrical resistivity decreases and also magnetic permeability increases
(C) electrical resistivity decreases and magnetic permeability increases
(D) electrical resistivity increases and magnetic permeability decreases.
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Electric Machine Design PART 2
27. Which of the following can be worked with higher flux densities ?
(A) Mild steel
(B) Silicon iron
(C) Cold rolled silicon steel
(D) Hot rolled silicon steel.
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28. Hysteresis loss varies with frequency (f) as
(A) f
(B) f 1.6
(C) f 2
(D) f 2.6
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29. Hysteresis loss varies with maximum flux density (B) as
(A) B
(B) B1.6
(C) B2
(D) B2.6.
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Electric Machine Design PART 2
30. In large bulky materials, the uni-axial anisotropy can be induced by
(A) cold rolling
(B) magnetic annealing
(C) magnetic quenching
(D) any of the above.
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