Which of the following statement about D.C. generators is false?

A Compensating winding in a D.C. machine helps in commutation
B In a D. C. generator interpoles winding is connected in series with the armature winding
C Back pitch and front pitch are both odd and approximately equal to the pole pitch
D Equalizing bus bars are used with parallel running of D.C. shunt generators

Correct Answer: Equalizing bus bars are used with parallel running of D.C. shunt generators

Bissoy MCQ
#Electrical Engineering #D.C. Generators

Related Questions

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
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
A pilot exciter is provided on generators for which of the following reasons ?
A To excite the poles of main exciter
B To provide requisite starting torque to main exciter
C To provide requisite starting torque to generator
D None of the above
Which of the following D.C. generators will be in a position to build up without any residual magnetism in the poles ?
A Series generator
B Shunt generator
C Compound generator
D None of the above
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 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 frequency of voltage generated, in case of generators, can be increased by
A Using reactors
B Increasing the load
C Adjusting the governor
D Reducing the terminal voltage
In D.C. generators on no-load, the air gap flux distribution in space is
A Sinusoidal
B Triangular
C Pulsating
D Flat topped
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
In D.C. generators the pole shoes are fastened to the pole core by
A Rivets
B Counter sunk screws
C Brazing
D Welding

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