In D.C. generators, the cause of rapid brush wear may be

Two generators are running in parallel. One of the generators may run as motor for which of the following reasons?

A

The direction of that generator is reversed

B

The speed of that generator is increased

C

The field of that generator is weakened

D

That generator takes large share of loads

Due to which of the following factors the brush wear rate is altered?

A

Speed of the machine

B

Contact pressure

C

Surface conditions of brush and commutator

D

All of the above

In a universal motor, the most common cause of brush sparking is

A

open armature winding

B

shorted armature winding

C

shorted field winding?

D

high commutator mica

E

all of the above

Find out which quotation parts of the following sentences has an error. If one 'wants' to keep up with the rapid advances in the rapid advances in work place 'technology' 'they' must plan 'to take' frequent refresher courses.

A

wants

B

technology

C

they

D

to take

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

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.

The students wear blue uniform. Here the word 'wear" can be replaced by.

A

bear with

B

put on

C

put up

D

put off

By "anthropogenic cause" for the rapid coastline erosion the author refers to........

A

frequent storm

B

rising sea level

C

increased salinity

D

human-induced activities

In D.C. generators, the cause of rapid brush wear may be

Related Questions