Electric Machine Design PART 4
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Attempt Free Electric Machine Design PART 4 Here. Read The Important Electrical MCQ From Below.
(A) heat conductivity
(B) dielectric strength
(C) mechanical strength
(D) volatility.Get Answer
47. The electric breakdown strength of an instating material depends on
(A) composition of the material
(B) thickness of the material
(C) time of application of voltage
(D) all of the above.
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48. When V is the voltage applied across the insulation, the dielectric loss for an insulating material will be proportional to
(A) V
(B) V2
(C) 1/ V
(D) 1/ V2
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Electric Machine Design PART 4
49. When δ is the dielectric loss angle, the value of tan δ increases with
(A) decrease in temperature
(B) presence of moisture
(C) voltage
(D) all of the above.
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50. Which has lowest dielectric strength
(A) Cotton
(B) Empire cloth
(C) Porcelain
(D) Mica.
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51. Silicon steel E330 indicates that
(A) it has 33% silicon
(B) it has normal specific loss at 50 Hz
(C) it is cold rolled grain oriented
(D) all of the above.
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52. Which of the following silicon steel will have least specific lose ?
(A) E11
(B) E42
(C) E31
(D) E41
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Electric Machine Design PART 4
54. In silicon steel designation like E320 the first figure 3 indicates
(A) the percentage of silicon
(B) the specific loss at 50 Hz
(C) the specific lose at 100 Hz
(D) the grain oriented cold rolled variety.
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55. In silicon steel designation like E320 , the second figure 2 represent
(A) specific loss
(B) direction of grain orientation
(C) magnetic variety
(D) non-magnetic variety.
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56. In high nickel alloys the percentage of nickel is
(A) 5 to 10 percent
(B) 10 to 20 percent
(C) 30 to 50 percent
(D) 70 to 80 percent.
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57. Pumps, blowers and fans are usually called for
(A) continuous duty
(B) short time duty
(C) intermittent periodic duty
(D) intermittent periodic duty with starting and braking.
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Electric Machine Design PART 4
58. Which of the following is normally called for continuous duty with starting and braking ?
(A) Machine tools
(B) Compressors
(C) Sirens
(D) Escalators.
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59. In lap windings, the equalizer rings arc used to save
(A) armature winding from carrying circulating currents
(B) commutator from carrying circulating currents
(C) brushes from carrying circulating currents
(D) armature core from eddy currents.
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60. Which of the following calls for intermittent duty with starting and braking ?
(A) Pumps
(B) Conveyors
(C) Wind lasses
(D) Cranes.
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Electric Machine Design PART 4
