MCQs 1: A D.C. generator can be considered as____________?
MCQs 2: The e.m.f. generated by a shunt wound D.C. generator isE. Now while pole flux remains constant, if the speed of the generator is doubled, the e.m.f. generated will be_______________?
MCQs 3: In any rotating machine that part which houses the conductors and in which e.m.f. induced is to be utilized is called____________?
MCQs 4: The armature core of a D.C. generator is usually made of__________________?
MCQs 5: In a D.C. machine stray loss is the sum of_____________?
total copper loss and mechanical loss
armature copper loss and iron loss
shunt field copper loss and mechanical loss
iron loss and mechanical loss
MCQs 6: Satisfactory commutation of D.C. machines requires______________?
brushes should be of proper grade and size
brushes should smoothly run in the holders
smooth, concentric commutator properly undercut
all of the above
MCQs 7: Lap winding is composed of_____________?
any even number of conductors
any odd number of conductors
that even number which is exact multiple of poles + 2
that even number which is exact multiple of poles
MCQs 8: Open circuited armature coil of a D.C. machine is________________?
identified by the scarring of the commutator segment to which open circuited coil is connected
indicated by a spark completely around the commutator
both A. and (b)
none of the above
MCQs 9: For the parallel operation of two or more D.C. compound generators, we should ensure that_______________?
voltage of the incoming generator should be same as that of bus bar
polarity of incoming generator should be same as that of bus bar
all the series fields should be run in parallel by means of equilizer connection
series fields of all generators should be either on positive side or negative side of the armature
all conditions mentioned above should be satisfied
MCQs 10: In a D.C. generator in case the resistance of the field winding is increased, then output voltage will____________?
MCQs 11: D.C. series generator is used_________________?
to supply traction load
to supply industrial load at constant voltage
voltage at the toad end of the feeder
for none of the above purpose
MCQs 12: An exciter for a turbo generator is a_____________?
MCQs 13: Following D.C. generator will be in a position to build up without any residual magnetism in the poles______________?
MCQs 14: Interpole flux should be sufficient to_____________?
neutralise the commutating self induced e.m.f.
neutralise the armature reaction flux
neutralise both the armature reaction flux as well as commutating e.m.f. induced in the coil
perform none of the above functions
MCQs 15: In case of a flat compounded generator:
voltage generated is less than the rated voltage
generated voltage is proportional to the load on the generator
voltage remains constant irrespective of the load
speed varies in proportion to the load on the generator
MCQs 16: D.C. generator generally preferred for charging automobile batteries is______________?
MCQs 17: In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when____________?
MCQs 18: Which of the following generator will have negligible terminal voltage while running on no-load?
MCQs 19: Which of the following D.C. generators will be in a position to build up without any residual magnetism in the poles?
MCQs 20: Permeance is the reciprocal of______________?
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