Electrical Engineering · Question Bank

DC Generators

196 questions · page 9 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
#161📘 EE Pocket Reviewer RojasEasy
How does a compensating winding be connected in a dc generator?
AIn series with the field windings
BIn parallel with the field windings
CIn parallel with the armature windings
DIn series with the armature windings
#162📘 EE Pocket Reviewer RojasEasy
What is the insulating medium used between commutator segments?
AMica
BGraphite
CPaper
DVarnish
#163📘 EE Pocket Reviewer RojasEasy
How much is the commutator pitch for a simplex wave winding?
AEqual to 1
BEqual to the pole pitch
CEqual to half the pole pitch
DEqual to twice the pole pitch
#164📘 EE Pocket Reviewer RojasEasy
Which of the following would cause one bar of a commutator segment to blacken?
AA shorted coil
BAn open coil
CA grounded coil
DA loose brush connection
#165📘 EE Pocket Reviewer RojasEasy
Which of the following type of brushes has the least voltage drop?
AGraphite brush
BCarbon brush
CCast iron brush
DMetal graphite brush
#166📘 EE Pocket Reviewer RojasEasy
What is the emf induced in a conductor rotating in a bipolar field?
ADC
BAC
CBoth DC and AC
DNone of these
#167📘 EE Pocket Reviewer RojasEasy
High mica between commutator bars is removed by which of the following?
AHot air blowing
BChiseling
CUndercutting
DWiping with a clean cloth
#168📘 EE Pocket Reviewer RojasEasy
How do you call the resistance of the windings of a generator?
AInternal resistance
BInduced resistance
CCritical resistance
DTerminal resistance
#169📘 EE Pocket Reviewer RojasEasy
What is the simplest way to shift load from one dc shunt generator running in parallel with another?
AUse equalizer connections
BAdjust their field rheostat
CInsert resistance in their armature circuit
DAdjust the speed of their prime movers
#170📘 EE Pocket Reviewer RojasEasy
What is the primary purpose of a commutator in a dc generator?
ATo increase the output voltage
BTo reduce sparking at the brushes
CTo provide smoother output voltage
DTo convert the ac induced voltage to dc
#171📘 EE Pocket Reviewer RojasEasy
What is the primary reason for providing compensating windings in a dc generator?
ATo compensate for decrease in main flux
BTo neutralize the armature mmf
CMaintain uniform flux distribution
DNeutralize cross-magnetizing flux
#172📘 EE Pocket Reviewer RojasEasy
The field coils of a dc generator are usually made from which of the following?
ACopper
BMica
CCast iron
DSilicon steel
#173📘 EE Pocket Reviewer RojasEasy
What is the voltage regulation of an ideal dc generator?
APositive value
BZero
CNegative value
DVery-high value
#174📘 EE Pocket Reviewer RojasEasy
In dc shunt generator which one is called constant loss?
AIron and field circuit losses
BIron and mechanical losses
CFriction, windage and stray load losses
DFriction, windage iron and field circuit losses
#175📘 EE Pocket Reviewer RojasEasy
Which of the following will restrict the voltage build up in a shunt generator?
ASaturation of iron
BSpeed of the prime mover
CArmature core heating
DNumber of armature coils
#176📘 EE Pocket Reviewer RojasEasy
What is the purpose of having an equalizer bar when connecting two compound generators in parallel?
ATo make the operation stable
BTo make the operation regular
CTo make the operation possible
DTo make the operation smooth
#177📘 EE Pocket Reviewer RojasEasy
Which of the following dc generators will have a terminal voltage that varies widely with changes in load current?
AShunt generator
BSeries generator
CLong shunt compound generator
DShort shunt compound generator
#178📘 EE Pocket Reviewer RojasEasy
Which of the following is the excitation current of the series field in a short-shunt compound dc generator?
AArmature current
BShunt field current
CLoad current
DExternal current
#179📘 EE Pocket Reviewer RojasEasy
How would you determine, from visual inspection that the armature winding is lap or wave connection?.
AIts connection to the field windings
BIts connection to the brushes
CIts direction of the end connection
DThrough the number of commutator segments
#180📘 EE Pocket Reviewer RojasEasy
According the Fleming's right hand rule for finding the direction of the induced emf, the forefinger points the direction of which of the following?
AMotion of conductor
BLines of force
CCurrent
DPower

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