For the parallel operation of two or more D.C. compound generators, we should ensure that

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

The essential condition for parallel operation of two D.C. generators is that they have

A

Same kW rating

B

The same operation r.p.m.

C

The same drooping voltage characteristics

D

Same percentage regulation

Shunt generators are most suited for stable parallel operation because of their

A

rising voltage characteristics

B

identical voltage characteristics

C

drooping voltage characteristics

D

linear voltage characteristics

The main factor which leads to unstable parallel operation of flat and over compounded generators is

A

their rising voltage characteristics

B

unequal number of turns in their series field windings

C

unequal speed regulation of their primemovers

D

unequal series field resistances

When two D.C. series generators are running in parallel, an equalizer bar is used

A

To increase the speed and hence generated e.m.f.

B

To increase the series flux

C

So that two similar machines will pass approximately equal currents to the load

D

To reduce the combined effect of armature reaction of both machines

When two D.C. generators are running in parallel an equalizer bar is used

A

To increase the series flux

B

To increase the generated e.m.f.

C

To reduce the combined effect of armature reaction of both the machines

D

So that the two identical machines will pass approximately equal currents to the load

Which of the following generators will be preferred if they are required to be run in parallel?

A

Shunt generators

B

Series generators

C

Compound generators

D

None of the above

The kidney transplant operation was _____ complited so the oprating team had to take special care to ensure the success.

A

sightly

B

Nearly

C

immediately

D

extremly

For the parallel operation of single phase transformers it is necessary that they should have

A

same efficiency

B

same polarity

C

same kVA rating

D

same number of turns on the secondary side.

The two parallel and coplanar shafts are connected by gears having teeth parallel to the axis of the shaft. This arrangement is known as

A

Spur gearing

B

Helical gearing

C

Bevel gearing

D

Spiral gearing

For the parallel operation of two or more D.C. compound generators, we should ensure that

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