Electrical Engineering · Question Bank

DC Generators

127 of 196 questions match · page 1 of 7. Answer in your head first, then check the solution.

📘 EE Mock Board Exam
TypeAll 196Problem solving 69Objective 127
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#1📜 EE Pre-Board August 2012📘 PowerhouseEasy
What is the nature of the current flowing in the armature of DC machine?
Apulsating dc
Bpure dc
Crectified dc
Dalternating current
#2📜 EE Pre-Board March 2013📘 PowerhouseEasy
The number of parallel paths in a simplex lap winding is equal to
A2
BNumber of poles
CNumber of pair of poles
D1
#3📜 EE Pre-Board March 2013📘 PowerhouseEasy
If the resistance of the field winding of a dc generator is increased the output voltage will
Adecrease
Bincrease
Cremain the same
Dfluctuate heavily
#4📜 EE Pre-Board March 2013📘 PowerhouseEasy
Brushes of dc machine are usually made of
Acarbon
Bhard copper
Csoft copper
Diron
#5📜 EE Pre-Board August 2013📘 PowerhouseEasy
A device that repeatedly reverse the polarity of a magnetic field in order to keep a dc motor rotating is known as
Aa solenoid
Ban armature coil
Ca commutator
Da field coil
#6📜 EE Pre-Board August 2013📘 PowerhouseEasy
The dc generator used as pilot exciter is
Aseries
BShunt
Cover compound
Dflat compound
#7📜 EE Pre-Board March 2014📘 PowerhouseEasy
In DC machines, lap winding is used for
Ahigh voltage, low current
Blow voltage, low current
Chigh voltage, high current
Dlow voltage, high current
#8📜 EE Pre-Board August 2014📘 PowerhouseEasy
Shunt generators are used where the main requirement is constant
Acurrent and voltage
Bcurrent
Cvoltage over a narrow load range
Dvoltage over a wide load range
#9📜 EE Pre-Board August 2014📘 PowerhouseEasy
What is the nature of the current flowing in the armature of dc machine?
Apulsating dc
Bpure dc
Crectified ac
Dalternating current
#10📜 EE Pre-Board March 2015📘 PowerhouseEasy
The current flowing in the armature conductors of a dc motor is
Aac
Bdc
Cac as well as dc
Dtransients
#11📜 EE Pre-Board March 2015📘 PowerhouseEasy
Lap winding is best siuited for voltage, current dc generators.
AHigh, Low
BLow, High
CHigh, High
DLow, Low
#12📜 EE Pre-Board March 2015📘 PowerhouseEasy
The dc armature winding in which the coil sides are placed a pole pitch apart is called winding.
AMultiplex
BFull-pitch
CFractional-pitch
DPole-pitch
#13📜 EE Pre-Board March 2016📘 PowerhouseEasy
Once residual magnetism of a shunt generator is lost, it may be restored by connecting its shunt field.
Ato earth
Bin reverse
Cto an external battery
Dto an alternator
#14📜 EE Pre-Board March 2017📘 PowerhouseEasy
With reference to armature windings, wave windings are often called __________ windings.
Acascade
Bring
Cmultiple or parallel
Dseries
#15📜 EE Pre-Board March 2017📘 PowerhouseEasy
The purpose of providing dummy coils in a generator is
Ato reduce eddy current losses
Bto enhance flux density
Cto amplify voltage
Dto provide mechanical balance for the rotor
#16📜 EE Pre-Board August 2017📘 PowerhouseEasy
In a shunt generator the voltage builds up until constrained by
Aarmature reaction
Bfield resistance
Csaturation of iron
Dbrush drop
#17📜 EE Pre-Board August 2017📘 PowerhouseEasy
The series field of a short-shunt compound dc generator is excited by ______ current.
Aarmature
Bshunt field
Cno
Dload (line)
#18📜 EE Pre-Board March 2018📘 PowerhouseEasy
In dc machines, lap winding is used for
Ahigh voltage low current
Blow voltage low current
Chigh voltage high current
Dlow voltage high current
#19📜 EE Pre-Board March 2018📘 PowerhouseEasy
The number of parallel paths in a simplex lap winding is equal to
A2
Bnumber of poles
Cnumber of pairs of poles
D1
#20📜 EE Pre-Board August 2018📘 PowerhouseEasy
The dummy coil in dc machines is used to
Aeliminate reactance voltage
Beliminate armature reaction
Cbring about mechanical balance of armature
Deliminate harmonics developed in the machine

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