Related Questions

l felt fragile after the operation. Here ‘fragile’ means-
A easily damaged
B vulnerable
C weak
D nervous
If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be
A Demagnetization only
B Cross magnetization as well as magnetization
C Cross-magnetization as well as demagnetizing
D Cross magnetization only
The material for commutator brushes is generally
A Mica
B Copper
C Cast iron
D Carbon
In D.C. generators, the brushes on commutator remain in contact with conductors which
A Lie under South Pole
B Lie under North Pole
C Lie under interpolar region
D Are farthest from the poles
The number of brushes in a commutator depends on
A Speed of armature
B Type of winding
C Voltage
D Amount of current to be collected
The rapid wear of brushes takes place due to
A Abrasion from dust
B Excessive spring pressure
C Rough commutator bars
D All of the above factors
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
A Bondability
B Embeddability
C Comformability
D Fatigue strength
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.
A 6%
B 8%
C 20%
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?
A 20%
B 331/3%
C 50%
D 66.2/3%
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 ?
A Many new cars are built with seat belts that automatically fasten when someone sits in the font seat.
B Automobile insurance rates for all automobile owners are higher because of the need to pay for the increased injuries or deaths of people not wearing seat belts.
C Passengers in airplanes are required to wear seat belts during takeoffs and landings.
D The rate of automobile fatalities in districts that do not have mandatory seat-belt laws is greater than the rate of fatalities in districts that do have such laws.

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