Electrical Machine Design Interview MCQ - Set 08 - ObjectiveBooks

Electrical Machine Design Interview MCQ - Set 08

Practice Test: Question Set - 08


1. The surge phenomenon is particularly important in case of
    (A) Low voltage transformers
    (B) Medium voltage transformers
    (C) High voltage transformers
    (D) Any of the above

2. For 275 kV transformers, using cold rolled grain oriented steel, which of the following values of flux density may be used?
    (A) 1.0 Wb/m2
    (B) 1.1 Wb/m2
    (C) 1.3 Wb/m2
    (D) 1.6 Wb/m2

3. The distance between the starts of two consecutive coils measured in terms of coil sides is called
    (A) Front pitch
    (B) Winding pitch
    (C) Commutator pitch
    (D) Back pitch

4. With direct water cooling it is possible to have ratings of about
    (A) 200 MW
    (B) 300 MW
    (C) 400 MW
    (D) 600 MW

5. _________is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties?
    (A) Grey cast-iron
    (B) Cast steel
    (C) High carbon steel
    (D) Stainless steel

6. Aluminium when adopted as a conductor material in ________ transformers, decreases the overall cost of the transformer
    (A) Small size
    (B) Medium size
    (C) Large size
    (D) Any of the above size

7. If an insulating material is operated beyond the maximum allowable temperature, its life is
    (A) Drastically increased
    (B) Drastically reduced
    (C) Unaffected
    (D) None of the above

8. Hydrogen has a heat transfer coefficient _________ times that of air
    (A) 1.5
    (B) 2.5
    (C) 3.5
    (D) 4.5

9. The operation of a D.C. machine with large air gap lengths is comparatively
    (A) Quiet
    (B) Noisy
    (C) Either of the above
    (D) None of the above

10. Which of the following is the basic consideration in the design of insulation?
    (A) Electrical considerations
    (B) Mechanical considerations
    (C) Thermal considerations
    (D) All of the above

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