Electrical Engineering · Question Bank

DC Generators

196 questions · page 10 of 10. Answer in your head first, then check the solution.

📘 EE Mock Board Exam
TypeAll 196Problem solving 69Objective 127
DifficultyAll 196Easy 146Medium 41Hard 9
#181📘 EE Pocket Reviewer RojasEasy
Which one is true about the comparison between a dc machine and an ac machine with the same rating?
AThe dc machine has more weight
BBoth machines have similar weight
CThe dc machine has lesser weight
DEither A or C, but seldom on
#182📘 EE Pocket Reviewer RojasEasy
Which of the following component of-a dc generator plays an important role for providing direct current?
AField windings
BEqualizer rings
CCommutator
DTypes of armature windings
#183📘 EE Pocket Reviewer RojasEasy
The yoke of a dc machine carries what percentage of the total flux?
A100%
B50%
C25%
DZero or no flux
#184📘 EE Pocket Reviewer RojasEasy
Which of the following dc generators will build up without any residual magnetism?
ASeries generator
BShunt generator
CCompound generator
DSeparately-excited generator
#185📘 EE Pocket Reviewer RojasEasy
Which of the following windings are used in a dc welding generator?
ALap windings
BWave windings
CDuplex wave winding
DDrum windings
#186📘 EE Pocket Reviewer RojasEasy
The armature of dc machine is made from which of the following materials?
ASilicon steel
BCast steel
CWrought iron
DSoft iron
#187📘 EE Pocket Reviewer RojasEasy
In dc generators, the pole shoes are fastened to the pole cores using which of the following?
ARivets
BBrazing
CWelding
DCounter sunk screws
#188📘 EE Pocket Reviewer RojasEasy
High voltage dc generators uses what type of windings?
ALap
BWave
CEither lap or wave
DCombination of lap and wave
#189📘 EE Pocket Reviewer RojasEasy
What is the purpose of having a dummy coil in a dc generator?
ATo reduce the copper loss
BTo generate more voltage
CTo distribute the armature current
DTo provide mechanical balance for the rotor
#190📘 EE Pocket Reviewer RojasEasy
If the shunt field of a compound generator is connected across both the series field and armature windings, how do you call the generator?
AShort shunt compound generator
BLong shunt compound generator
CCumulative compound generator
DDifferential compound generator
#191📘 EE Pocket Reviewer RojasEasy
Which one is true about the polarity of the interpoles in a dc generator?
AThe same as that of the main poles ahead
BOpposite to that of the main pole ahead
CIt has no polarity since it does not play an important role in generating an emf
DEither north or south depending on number of interpoles
#192📘 EE Pocket Reviewer RojasEasy
How can the residual magnetism of a dc shunt generator be restored assuming it is accidentally destroyed?
AGround the shunt field
BConnect the shunt field to an ac source
CConnect the shunt field to a dc source
DReverse the connection of the shunt field
#193📘 EE Pocket Reviewer RojasEasy
What is the purpose of having a dummy coil in a dc machine?
ATo eliminate armature reaction
BTo reduce the hysteresis loss
CTo eliminate harmonics developed in the armature
DTo mechanically balance the armature core
#194📘 EE Pocket Reviewer RojasEasy
What is the reason why poles of a dc machine are often laminated?
ATo reduce pulsation loss
BTo reduce the iron weight
CTo reduce armature reaction
DTo dissipate more heat
#195📘 EE Pocket Reviewer RojasEasy
Which one is a cause for excessive sparking at the brushes?
ALoose coupling
BWorn bearings
CShaft is not properly aligned
DDirt on the commutator segments
#196📘 EE Pocket Reviewer RojasEasy
What is the advantage of using carbon brushes than using copper brushes?
AIt can reduce sparking
BIt has a lower resistance
CIt has a longer life
DIt can reduce armature reaction

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