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

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

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

A

Voltage of the incoming generator should be same as that of bus bar

B

Polarity of incoming generator should be same as that of bus bar

C

All the series fields should be run in parallel by means of equalizer connection

D

Series fields of all generators should be either on positive side or negative side of the armature

For seccessful operation of two single phase transformer connected in parallel, the most essential condition is that their

A

Percentage impledances are equal

B

Polarities are properly connected

C

Turns ration are exactly equal

D

KVA rating are equal

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

The gypsys are a tribe of strange people. They do not have any fixed home but wander about from place to place and live in tents. they were originally natives of India. But as they reached England from Egypt ,the English took them from Egyptians. this is why they came to be called gypsys. they were beloved to possess strange powers. they could tell your fortune by reading the palm of your hand. it was thought they stole little children to train them in their way of life. whenever a child got lost it was thought that it has been carried away by gypsys so they were arrested and sent for trial. but this attitude towards the Gypsy has gradually changed.The gypsies are people who ---

A

have a settled way of life

B

came originally from Egypt to England

C

are always on the move

D

steal children to train them in the way of life

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

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

D.C. generators are connected to the bus-bars or disconnected from them only under the floating condition

A

To avoid sudden loading of the prime mover

B

To avoid mechanical jerk to the shaft

C

To avoid burning of switch contacts

D

All above

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

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