Electrical Engineering · Question Bank

DC Generators

196 questions · page 6 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
#101📘 EE Pocket Reviewer RojasEasy
Which of the following dc generator losses varies with the load connected to the generator?
AEddy current loss
BHysteresis loss
CCopper loss
DFriction and windage loss
#102📘 EE Pocket Reviewer RojasEasy
Which one is considered the real working part of a dc machine?
AArmature windings
BField windings
CArmature core
DCommutator and brushes
#103📘 EE Pocket Reviewer RojasEasy
How much is the commutator pitch for a simplex lap winding?
AEqual to the pole pitch
BEqual to twice the pole pitch
CEqual to 1
DEqual to half the pole pitch
#104📘 EE Pocket Reviewer RojasEasy
Which of the following would cause a generator to fail to build up?
AReversed field connections
BSpeed too low
CGenerator is short-circuited
DAll of these
#105📘 EE Pocket Reviewer RojasEasy
Which of the following is true about a dc machine having four poles?
AAll four poles are north poles
BAll four poles are south poles
CTwo north poles follow two south poles
DAlternate poles are north and south
#106📘 EE Pocket Reviewer RojasEasy
Which type of dc generators is used for arc welding purposes?
ASeries generator
BShunt generator
CCumulatively compounded generator
DDifferentially compounded generator
#107📘 EE Pocket Reviewer RojasEasy
With a dc generator which of the following voltage regulation is more preferred?
A1%
B50%
C100%
D75%
#108📘 EE Pocket Reviewer RojasEasy
Which of the following generators is used for charging automobile batteries?
ASeries generators
BShunt generators
CLong shunt compound generators
DShort shunt compound generators
#109📘 EE Pocket Reviewer RojasEasy
What is the reason for the rapid brush wear in dc generators?
AImperfect contact
BSevere sparking
CRough commutator surface
DAll of these
#110📘 EE Pocket Reviewer RojasEasy
What do you mean by “flashing” in a dc generator?
ATo increase the flux density by adding more turns in the field poles
BTo create residual magnetism by a dc source
CTo perform a short circuit test in the generator
DTo increase the excitation current in the field by lowering the rheostat resistance
#111📘 EE Pocket Reviewer RojasEasy
Equalizer connections are required when connecting two or more what type of dc generators?
ASeries generators
BShunt generators
CCompound generators
DAll of these
#112📘 EE Pocket Reviewer RojasEasy
In dc generators, the wave windings are used in which applications?
ALow voltage and low current
BHigh voltage and high current
CLow voltage and high current
DHigh voltage and low current
#113📘 EE Pocket Reviewer RojasEasy
What is the reason why dc generators are installed near the load center?
ATo reduce the iron losses
BTo reduce the sparking at the brushes
CTo reduce the corona losses
DTo reduce the line losses
#114📘 EE Pocket Reviewer RojasEasy
What is the probable cause why a dc generator gives electric shock upon touching its body?
AWeak insulation on the armature coils
BLoose earth wire
CGrounded armature coils
DAll of these
#115📘 EE Pocket Reviewer RojasEasy
What is the proper color of a commutator?
AGlazed chocolate
BDark brown
CReddish brown
DShiny brown
#116📘 EE Pocket Reviewer RojasEasy
What is the coupling field between electrical and mechanical systems of a dc machine?
AElectric field
BMagnetic field
CMechanical field
DAll of these
#117📘 EE Pocket Reviewer RojasEasy
What is the effect of the armature magnetic field to the main magnetic field?
AIt will demagnetize or weakens the main field
BIt will cross magnetize or distort the main field
CIt will magnetize or strengthen the main field
DBoth A and B
#118📘 EE Pocket Reviewer RojasEasy
In the commutation process which of the following is getting reversed?
ACurrent
BVoltage
CPower
DAll of these
#119📘 EE Pocket Reviewer RojasEasy
Which of the following is a simple method of increasing the voltage of a dc generator?
AIncrease the length of armature
BIncrease the air gap of flux density
CIncrease the load on the generator
DIncrease the speed of rotation
#120📘 EE Pocket Reviewer RojasEasy
How do you call the armature winding pitch in which the coil sides are a pole pitch apart?
AFull pitch
BFractional pitch
CPole pitch
DUnity pitch

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