Related Questions

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
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
When a bar of length '$$l$$' and diameter 'd' is rigidly fixed at the upper end and hanging freely, then the total elongation produced in the bar due to its own weight is (where w = Weight per unit volume of the bar)
A $$\frac{{{\text{w}}l}}{{2{\text{E}}}}$$
B $$\frac{{{\text{w}}{l^2}}}{{2{\text{E}}}}$$
C $$\frac{{{\text{w}}{l^3}}}{{2{\text{E}}}}$$
D $$\frac{{{\text{w}}{l^4}}}{{2{\text{E}}}}$$
Roni is running on the ground who has been running a business for a year and his is a running business. What are the differences among the underlined words respectively?
A Finite Verb, Infinite Verb, continous
B Transitive, Intransitive, Gerund
C Transitive, Intransitive, Adjective
D Present Continuous, Perfect Continuous, Gerund
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
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
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
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
Equalizer rings are required in case armature is
A Wave wound
B Lap wound
C Delta wound
D Duplex wound

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