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Why is the armature of DC generator laminated?
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asked
Mar 3, 2018
by
anonymous
Why is the armature of DC generator laminated?
armature
dc
generator
laminated
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answered
Mar 3, 2018
by
anonymous
The armature of DC generator is laminated
to reduce eddy current losses.
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Related questions
asked
Mar 20, 2018
by
anonymous
The armature of D.C. generator is laminated to
armature
dc
generator
laminated
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answers
asked
May 8, 2018
by
anonymous
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ohm. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is
Last answer:
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ohm. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is 0.87
dc
machine
supplies
generator
armature
resistance
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1
answer
asked
Mar 20, 2018
by
anonymous
The armature core of a D.C. generator is usually made of?
Last answer:
The armature core of a D.C. generator is usually made of silicon steel.
armature
core
dc
generator
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85
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1
answer
asked
Mar 20, 2018
by
anonymous
The demagnetising component of armature reaction in a D.C. generator?
Last answer:
The demagnetising component of armature reaction in a D.C. generator reduces generator e.m.f.
demagnetising
component
armature
reaction
dc
generator
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72
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1
answer
asked
Apr 27, 2020
by
anonymous
Why poles of dc machine are laminated?
Why poles of dc machine are laminated?
Last answer:
Poles of DC machines are laminated to reduce the eddy current losses in the poles.
why
poles
of
dc
machine
are
laminated
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asked
Apr 28, 2018
by
anonymous
The armature reaction in a synchronous generator supplying leading power factor load is
The armature reaction in a synchronous generator supplying leading power factor load is (A) magnetizing (B) demagnetizing (C) demagnetizing and cross-magnetizing (D) magnetizing and cross-magnetizing
Last answer:
The armature reaction in a synchronous generator supplying leading power factor load is magnetizing and cross-magnetizing
armature
reaction
synchronous
generator
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1
answer
asked
Apr 29, 2018
by
anonymous
Aluminium is not used as winding wire for the armature of a dc machine because
Aluminium is not used as winding wire for the armature of a dc machine because (1) aluminium has low resistivity (2) a large winding space is taken by aluminium conductors and creates jointing problems (3) the thermal conductivity of aluminium is low (4) aluminium has low conductivity as compared to copper
Last answer:
Aluminium is not used as winding wire for the armature of a dc machine because (2) a large winding space is taken by aluminium conductors and creates jointing problems (3) the thermal conductivity of aluminium is low (4) aluminium has low conductivity as compared to copper
aluminium
winding
wire
armature
dc
machine
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1
answer
asked
May 3, 2018
by
anonymous
A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance
A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is
Last answer:
A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is 36 Ohm
dc
shunt
motor
running
current
armature
winding
resistance
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175
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1
answer
asked
May 1, 2018
by
anonymous
In dc machines, the armature windings are placed on the rotor because of the necessity for
In dc machines, the armature windings are placed on the rotor because of the necessity for (1) electromechanical energy conversion (2) generation of voltage (3) commutation (4) development of torque
Last answer:
3 Commutation
dc
machines
armature
windings
rotor
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2
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asked
Apr 29, 2018
by
anonymous
The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors
The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors rotating at 600 rpm and with 1 Wb flux per pole is (1) 1000V (2) 100V (3) 600V (4) 10,000V
Last answer:
The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors rotating at 600 rpm and with 1 Wb flux per pole is 1000V
induced
emf
armature
lap-wound
four-pole
dc
machine
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1
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asked
Aug 9, 2017
by
anonymous
Armature control of DC motor
Armature control of DC motor
Last answer:
Armature control of DC motor
armature
control
dc
motor
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2
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asked
Mar 21, 2018
by
anonymous
A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave?
Last answer:
A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave will be of 5 Hz.
sinusoidal
field
shunt
generator
armature
voltage
wave
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1
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asked
Mar 21, 2018
by
anonymous
Armature reaction in a generator results in?
Last answer:
Armature reaction in a generator results in demagnetisation of leading pole tip and magnetisation of trailing pole tip.
armature
reaction
generator
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1
answer
asked
Mar 15, 2018
by
anonymous
What is the principle of DC generator?
What is the principle of DC generator?
principle
dc
generator
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answers
asked
Mar 15, 2018
by
anonymous
What is the difference between an AC and DC generator?
What is the difference between an AC and DC generator?
Last answer:
The generator which generates DC voltage is called DC generator and generator which generates AC voltage is called AC generator (or) Alternator. In DC generator armature is rotated and field winding ... generator. A DC generator can generate low voltages but an AC generator can generate upto 11kv.
difference
between
ac
dc
generator
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1
answer
asked
May 1, 2018
by
anonymous
The fall in speed of a dc generator due to increase in load can be corrected by
The fall in speed of a dc generator due to increase in load can be corrected by (1) cooling the armature.. (2) increasing the excitation. (3) reducing the load voltage. (4) increasing the input to the prime mover
Last answer:
It can be corrected by increasing the input to the prime mover.
speed
dc
generator
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2
answers
asked
Apr 29, 2018
by
anonymous
In a DC generator the windings of interpoles are connected :
In a DC generator the windings of interpoles are connected : (A) in series with main field winding, to create a pole,of same polarity as the main pole ahead in the direction of rotation. (B) in series with main field winding, to create a pole of opposite polarity as the main pole ahead in the direction of ... in the direction of rotation. (D) in series with the armature winding, to create a pole of opposite polarity as the main pole ahead in the direction of rotation.
Last answer:
In a DC generator the windings of interpoles are connected : in series with the armature winding, to create a pole of same polarity as the main pole ahead in the direction of rotation.
dc
generator
windings
interpoles
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1
answer
asked
Mar 3, 2018
by
anonymous
From which material field coils of DC generator are made of?
From which material field coils of DC generator are made of?
Last answer:
Field coils of DC generator are usually made of copper.
material
field
coils
dc
generator
made
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1
answer
asked
Mar 20, 2018
by
anonymous
The armature torque of the D.C. shunt motor is proportional to?
Last answer:
The armature torque of the D.C. shunt motor is proportional to armature current.
armature
torque
dc
shunt
motor
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88
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1
answer
asked
Mar 20, 2018
by
anonymous
The armature voltage control of D.C. motor provides?
Last answer:
The armature voltage control of D.C. motor provides constant torque drive.
armature
voltage
control
motor
dc
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1
answer
asked
Mar 20, 2018
by
anonymous
In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be?
Last answer:
In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be more than full-load current.
dc
shunt
motor
conditions
maximum
power
current
armature
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1
answer
asked
Mar 20, 2018
by
anonymous
For a D.C. generator when the number of poles and the number of armature conductors is fixed...
For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f. ?
Last answer:
Wave winding
dc
generator
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1
answer
asked
Apr 30, 2018
by
anonymous
The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density.
The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is : (A) 256 W (B) 320 W (C) 500 W (D) 625 W
Last answer:
The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is : 625 W
eddy
current
loss
dc
generator
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79
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1
answer
asked
Apr 28, 2018
by
anonymous
The terminal characteristics of a dc generator suitable for electric welders is
The terminal characteristics of a dc generator suitable for electric welders is (A) separately excited generator (B) shunt generator (C) series generator (D) differentially compounded generator
Last answer:
The terminal characteristics of a dc generator suitable for electric welders is differentially compounded generator
terminal
characteristics
dc
generator
electric
welders
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1
answer
asked
Sep 30, 2017
by
anonymous
why the Transformer core is laminated?
Last answer:
Transformer core is laminated to reduce Eddy current losses.
transformer
core
laminated
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87
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1
answer
asked
Mar 14, 2018
by
anonymous
Why does the core of a transformer need to be laminated?
Why does the core of a transformer need to be laminated?
Last answer:
Transformer cores are laminated to reduce eddy current loss.
core
transformer
need
laminated
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1
answer
asked
Jul 27, 2019
by
anonymous
State the function of commutator in DC generator and name the material used for commutator.
State the function of commutator in DC generator and name the material used for commutator.
Last answer:
Function of Commutator: Commutator converts AC induced in armature winding into DC for external load. Material: i) Commutator segments are made up of Copper. ii) Commutator segments are insulated from each other by Mica.
commutator
dc
generator
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1
answer
asked
Mar 26, 2018
by
anonymous
The normal value of the armature resistance of a d.c. motor is?
The normal value of the armature resistance of a d.c. motor is?
Last answer:
The normal value of the armature resistance of a d.c. motor is 0.5.
dc
motor
armature
resistance
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1
answer
asked
Mar 20, 2018
by
anonymous
When the armature of a D.C. motor rotates, e.m.f. induced is
Last answer:
When the armature of a D.C. motor rotates, e.m.f. induced is back e.m.f.
armature
dc
motor
rotates
emf
induced
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1
answer
asked
Mar 20, 2018
by
anonymous
Open circuited armature coil of a D.C. machine is?
Last answer:
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 and indicated by a spark completely around the commutator.
open
circuited
armature
coil
dc
machine
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1
answer
asked
Mar 21, 2018
by
anonymous
The critical resistance of the D.C. generator is the resistance of?
Last answer:
The critical resistance of the D.C. generator is the resistance of field.
critical
resistance
dc
generator
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143
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1
answer
asked
Mar 21, 2018
by
anonymous
In a D.C. generator in case the resistance of the field winding is increased, then output voltage will?
Last answer:
In a D.C. generator in case the resistance of the field winding is increased, then output voltage will decrease.
dc
generator
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1
answer
asked
Mar 21, 2018
by
anonymous
If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be?
Last answer:
If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be zero.
residual
magnetism
dc
generator
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190
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1
answer
asked
Mar 21, 2018
by
anonymous
A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be?
Last answer:
A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be about 2 V.
generator
dc
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264
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1
answer
asked
Mar 21, 2018
by
anonymous
The e.m.f. generated in a D.C. generator is directly proportional to?
Last answer:
The e.m.f. generated in a D.C. generator is directly proportional to speed of armature.
dc
generator
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303
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1
answer
asked
Mar 20, 2018
by
anonymous
The condition for maximum efficiency for a D.C. generator is?
Last answer:
The condition for maximum efficiency for a D.C. generator is variable losses equal to constant losses.
condition
maximum
efficiency
dc
generator
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153
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1
answer
asked
Mar 21, 2018
by
anonymous
In a level compounded D.C. generator, full load terminal voltage is?
Last answer:
In a level compounded D.C. generator, full load terminal voltage is equal to no-load terminal voltage.
level
compounded
dc
generator
full
load
terminal
voltage
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75
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1
answer
asked
Mar 20, 2018
by
anonymous
D.C. generator generally preferred for charging automobile batteries is?
Last answer:
D.C. generator generally preferred for charging automobile batteries is long shunt compound generator.
dc
generator
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1
answer
asked
Mar 20, 2018
by
anonymous
Magnetic field in a D.C. generator is produced by?
Last answer:
Magnetic field in a D.C. generator is produced by electromagnets.
magnetic
field
dc
generator
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100
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1
answer
asked
Mar 21, 2018
by
anonymous
In a D.C. generator the critical resistance refers to the resistance of?
Last answer:
In a D.C. generator, the critical resistance refers to the resistance of field.
dc
generator
resistance
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1
answer
asked
Mar 21, 2018
by
anonymous
Flashing the field of D.C. generator means?
Last answer:
Flashing the field of D.C. generator means creating residual magnetism by a D.C. source.
flashing
field
generator
dc
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1
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asked
Mar 20, 2018
by
anonymous
In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when?
Last answer:
In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when number of poles is 2.
generator
dc
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597
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1
answer
asked
Mar 20, 2018
by
anonymous
In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be?
Last answer:
In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be 8.
dc
generator
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1
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asked
Mar 20, 2018
by
anonymous
The total losses in a well designed D.C. generator of 10 kW will be nearly?
Last answer:
The total losses in a well designed D.C. generator of 10 kW will be nearly 500 W.
losses
dc
generator
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97
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1
answer
asked
Mar 20, 2018
by
anonymous
If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be?
Last answer:
If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be crossmagnetisation as well as demagnetising.
generator
dc
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1
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asked
Mar 25, 2018
by
anonymous
In AC. circuits, laminated iron is invariably used in order to?
In AC. circuits, laminated iron is invariably used in order to?
Last answer:
In AC. circuits, laminated iron is invariably used in order to reduce eddy current loss.
ac
circuits
laminated
iron
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76
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1
answer
asked
Mar 21, 2018
by
anonymous
If a D.C. generator fails to build up the probable cause could not be?
Last answer:
If a D.C. generator fails to build up the probable cause could not be field resistance less than the critical resistance.
generator
dc
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71
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1
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asked
Mar 21, 2018
by
anonymous
In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when?
Last answer:
In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when there is no load on|he generator.
dc
generator
magnetic
neutral
geometrical
axis
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126
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1
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asked
Mar 20, 2018
by
anonymous
In a D.C. generator the actual flux distribution depends upon?
dc
generator
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0
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asked
Mar 20, 2018
by
anonymous
In a D.C. generator the ripples in the direct e.m.f. generated are reduced by?
Last answer:
In a D.C. generator the ripples in the direct e.m.f. generated are reduced by using carbon brushes of superior quality.
dc
generator
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