Important Electrical Machine Design Multiple Choice Questions and Answers


21.  Turbo alternators have......


   A. Large diameters and great axial lengths

   B. Large diameters and narrow axial lengths

   C.Short diameters and narrow axial lengths

   D. Short diameters and great axial lengths


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D. Short diameters and great axial lengths

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22.  A synchronous machine with a large length of air gap will have


   A. Lower limit of stability

   B. Higher value of inherent regulation

   C.Higher noise level

   D. Smaller unbalanced magnetic pull


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D. Smaller unbalanced magnetic pull

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23.  A large value of short circuit current indicates


   A. A poor power factor

   B. A good power factor

   C. Zero power factor

   D. None of the above


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B. A good power factor

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24.  Due to which off the following harmonic fields are produced?


   A. Windings

   B.Slotting

   C.Saturation

   D. All of the above


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D. All of the above

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25.  Which of the following factors should be considered when estimating the length of air gap?


   A. Power factor

   B. over load capacity

   C. Pulsation loss

   D. All of the above


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D. All of the above

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