Electric Machine Design PART 3
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Attempt Free Electric Machine Design PART 3 Here. Read The Important Electrical MCQ From Below.
31. Magnetostriction
(A) grain oriented magnetic properties
(B) represents the upper limit to which magnetic properties can be induced
(C) change in dimensions resulting from magnetisation of ferromagnetic materials
(D) none of the above.
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32. An ideal insulating material should have low
(A) insulation resistance
(B) dielectric strength
(C) dielectric loss angle
(D) mechanic strength.
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33. The class of insulation used for large rating HV alternators
(A) Y
(B) A
(C) B
(D) C.
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Electric Machine Design PART 3
34. Asbestos has
(A) fibrous structure
(B) crystalline structure
(C) grain oriented crystalline structure
(D) none of the above.
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35. Asbestos can bear a temperature up to __________ without loosing its insulating properties
(A) 100°C
(B) 200°C
(C) 300°C
(D) 400°C.
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36. Fibre glass insulation can be used up to temperature of
(A) 60°C
(B) 80°C
(C) 130°C
(D) 180°C
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37. Raw form of natural rubber is known as
(A) malamine
(B) milk of lime
(C) epoxy
(d) latex.
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Electric Machine Design PART 3
38. Which of the following is the characteristic of ceramic insulators ?
(A) These are hard, strong and dense
(B) These are stable at high temperatures
(C) These are unaffected by commercial acids and alkalies
(D) All of the above.
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39. The number of commutator segments in a dc machine is equal to the no. of
(A) coil-sides
(B) turns
(C) coils
(D) slots.
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40. Dielectric strength of PVC is around
(A) 5 kV/mm
(B) 10 kV/mm
(C) 15 kV/mm
(D) 30 kV/mm.
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41. Gaseous insulating material
(A) Teflon
(B) Sulphur hexafluoride
(C) Stealite
(D) Phologopite mica.
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Electric Machine Design PART 3
42. Silver finds application generally as
(A) contact material
(B) fusing material
(C) low temperature insulating material
(D) none of the above.
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43. When I is the current in amperes, the temperature rise at which fuse wire will melt is proportional to
(A) I
(B) I 2
(C) 1/ I
(D) 1/ I2
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44. The fusing current depends on
(A) diameter of fuse wire
(B) number of strands of wire
(C) length of the fuse wire
(D) all of the above.
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Electric Machine Design PART 3
45. Class H insulation is normally used in
(A) traction motors
(B) submersible pump motors
(C) single phase motors
(D) dc motors.
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