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Electric Machine Design - Electric Machine Design
  1. In large bulky materials, the uni-axial anisotropy can be induced by
    2. A.
    cold rolling
    B.
    magnetic annealing
    C.
    magnetic quenching
    D.
    any of the above

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  2. Hysteresis loss varies with maximum flux density (B) as
    3. A.
    B
    B.
    B1.6
    C.
    B2
    D.
    B2.6

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  3. Hysteresis loss varies with frequency (f) as
    4. A.
    f
    B.
    f 1.6
    C.
    f 2
    D.
    f 2.6

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  4. Which of the following can be worked with higher flux densities ?
    5. A.
    Mild steel
    B.
    Silicon iron
    C.
    Cold rolled silicon steel
    D.
    Hot rolled silicon steel

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  5. By adding silicon to ferromagnetic , materials
    6. 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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  6. Which of the following gives materials in order of increasing values of permeability ?
    7. 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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  7. Diamagnetic : Ferromagnetic ::
    8. A.
    Copper: Silver
    B.
    Air: Water
    C.
    Iron: Steel
    D.
    Lead: Cobalt

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  8. Diamagnetic: Copper:: Ferromagnetic:
    9. A.
    Iron
    B.
    Lead
    C.
    Air
    D.
    Water

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  9. All of the following are ferromagnetic materials EXCEPT
    10. A.
    Nickel
    B.
    Bismuth
    C.
    Silicon
    D.
    Mild steel

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  10. For simplex wave and lap windings, the back pitch yb and front pitch yf are as follows:
    11. 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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