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

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

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

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

   A. Windings

   B.Slotting

   C.Saturation

   D. All of the above

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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