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l felt fragile after the operation. Here ‘fragile’ means-
If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be
The material for commutator brushes is generally
In D.C. generators, the brushes on commutator remain in contact with conductors which
The number of brushes in a commutator depends on
The rapid wear of brushes takes place due to
The property of a bearing material which has the ability to accommodate shaft deflections and bearing inaccuracies by plastic deformation without excessive wear and heating, is known as
In a certain class 40% of the students are girls, and 20% of the girls wear glasses. What percent of students in the class are girls who wear glasses.
At a symposium, 20% of the professors are psychologists , 60% are biologists and the remaining 12 professors are economist. If 20 of the professors wear glasses, what percent of the professors do not wear glasses?
Opponents of laws that require automobile drivers and passengers to wear seat belts argue that in a free society people have the right to take risks as long as the people do not harm the others as a result of taking risks.As a result,they conclude that it should be each person's decision whether or not to wear a seat belt. Which of the following, if true,most seriously weakens the conclusion drawn above ?