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Course Co-ordinated by
IIT Kharagpur
NPTEL
>>
Courses
>>
Electrical Engineering
>> Electrical Machines -I (Video) >>
Introduction
Question in Lecture
Electrical Machines -I
Introduction
Operating Principles and Construction of Single Phase Transformers
Modeling of Single Phase Transformers
Equivalent Circuits of Single Phase Transformers
Testing of Single Phase Transformers
Efficiency of Single Phase Transformers
Voltage Regulation of Single Phase Transformers
Parallel Operation of Single Phase Transformers
Harmonics and Switching Transients in Single Phase Transformers
Introduction to Three Phase Transformer
Construction of Three Phase Transformers
Three Phase Transformer Connections
Three Phase Transformer Phase Groups Part - I
Three Phase Transformer Phase Groups Part - II
Analysis and Testing of Three Phase Transformers
Operation of Three Phase Transformers
Auto Transformers
Three Winding Transformers
Scott Connected Transformers
Potential and Current Transformers
Operating Principles of DC Machines
Constructional Features of DC Machines
Generated EMF and Torque in DC Machines
Armature Reaction
Commutation in DC Machines
Separately Excited DC Generators
DC Shunt Generators
Compound DC Generators
Interconnected DC Generators
Characteristics of DC Shunt Motors
Starting of DC Shunt Motors
Speed Control of DC Shunt Motors
Braking of DC Shunt Motors
Electronic Control of DC Shunt Motors
Testing of DC Shunt Motors
Characteristics of DC Series Motors
Starting and Braking of DC Series Motors
Speed Control and of DC Series Motors
Testing of DC Series Motors
Characteristics of Compound DC Series Motors
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Question:
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NOTE: Before you post question check if your question already exists.Please do not repeat questions.
All Questions
Question:
thanx a lot for uploading this.!!waiting eagerly for electrical machines part 2.
By:
levicorpus
Date:
2012-07-11
The co-ordinator will post his answer
Question:
sir can you offer MCQ ...
By:
gopal
Date:
2012-07-12
The co-ordinator will post his answer
Question:
sir when will electrical machines-2 uploaded
By:
gopal
Date:
2012-07-12
The co-ordinator will post his answer
Question:
I take this opportunity to thank you you uploading this series on Electrical machine.At around time 50:00 min you have mentioned the direction of current in the coil in downward direction mentioning that its obvious.The fundamental behind is not clear to me.If you can explain,it will help.
By:
Rishi
Date:
2012-07-12
The co-ordinator will post his answer
Question:
Sir,will the induction machine portion be covered in electrical machines 2? As when i am checking the syllabus,it shows that dc machine is to be covered in part 2 whereas induction machine in part 1.however the contents seem to interchanged..is it??jst wanted to be assured!!
By:
levicorpus
Date:
2012-07-13
The co-ordinator will post his answer
Question:
in lecture 8,prof. kastha mentions that it is preferable to do no-load test in a 1-phase transformer by applying the voltage across a variac rather than a large supply with resistance in series to drop the extra voltage just bcoz hysteresis loop in later case leading to large current peak(harmonic)
By:
levicorpus
Date:
2012-07-17
The co-ordinator will post his answer
Question:
(continuing from last question..)but even if one applies supply voltage with a variac then also due to nonlinear nature of transformer core,currents do turn nonsinusoidal and large current peak occur thru 3rd harmonic summation.so how doing no load test with variac on this ground is justified?
By:
levicorpus
Date:
2012-07-17
The co-ordinator will post his answer
Question:
*sorry,it will be lecture 9
By:
levicorpus
Date:
2012-07-17
The co-ordinator will post his answer
Question:
it will be a great help if the lectures on synchronous and induction m/c can be uploaded.please upload electrical machine -II SOON.IS LOST WITHOUT IT.
By:
ranojay
Date:
2012-07-19
The co-ordinator will post his answer
Question:
sir,it would be very helpful to every ee student, if further video course on electrical machines is also uploaded,
By:
rakesh92
Date:
2012-07-22
The co-ordinator will post his answer
Question:
Please upload electrical machines - II lectures
By:
Rizwan
Date:
2012-08-01
The co-ordinator will post his answer
Question:
nnnnnnnnnnnnnnn
By:
viswanathan
Date:
2012-08-03
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Question:
sir is it possible for generating power by using circular magnets, construction wise both the stator and rotor are in magnet like our induction motor
By:
viswanathan
Date:
2012-08-03
The co-ordinator will post his answer
Question:
Why transformer is rated in Kva ? please answer this question
By:
Muhammad Wajid Sarwar
Date:
2012-08-04
The co-ordinator will post his answer
Question:
why is there no reply to any posts???atleast inform us when machine 2 lectures will be uploaded...that way we can be sure whether it is before GATE 2013 or not!!
By:
ranojay
Date:
2012-08-07
The co-ordinator will post his answer
Question:
sir ,how to purchase thids electrical machine1......video cd........... c.d are copy right proctected or not
By:
abhishek
Date:
2012-08-08
The co-ordinator will post his answer
Question:
What will happen when direction of field current is changed (i.e, field excitation is reversed) in the following machines? 1) Alternator 2) Synchronous Motor 3) D.C Generator ( Shunt or Seies ) 4) D.C Motor ( Shunt or Seies )
By:
Somenath Das
Date:
2012-08-09
The co-ordinator will post his answer
Question:
how capacitor opposes change of voltage?
By:
shilpi
Date:
2012-08-10
The co-ordinator will post his answer
Question:
example of linear and non linear element with explanation?
By:
shilpi
Date:
2012-08-10
The co-ordinator will post his answer
Question:
why inductor do not change currentand capacitor do not change voltage instanteneously
By:
shilpi
Date:
2012-08-10
The co-ordinator will post his answer
Question:
Please upload the Electrical Machines -II. Thank you for your considerations. How can we order the course DVDs?
By:
Mehrdad
Date:
2012-08-13
The co-ordinator will post his answer
Question:
I am interested in practical winding motors. Could you please provide me some books which mane subject is armature winding. thanks
By:
Hassan
Date:
2012-08-27
The co-ordinator will post his answer
Question:
can you please tell 1.what is meant by induction? 2.what is the difference between induction and conduction motor ? thanks & regards, suba
By:
SUBA
Date:
2012-08-27
The co-ordinator will post his answer
Question:
what is relation between field excitation and reactive power in 3 phase synchronous generator ?? how reactive power changes with change in field current??
By:
Puran Dhakrey
Date:
2012-09-01
The co-ordinator will post his answer
Question:
about magnetising inrush in transformer
By:
roshan
Date:
2012-10-06
The co-ordinator will post his answer
Question:
what is magnetising inrush in transformer ?
By:
roshan
Date:
2012-10-06
The co-ordinator will post his answer
Question:
How to calculate time constant of any circuit in PSPiCE?
By:
sathya
Date:
2012-10-06
The co-ordinator will post his answer
Question:
what is the difference between alternator and syvchronous motor ohasor diagram?
By:
Date:
2012-10-09
The co-ordinator will post his answer
Question:
Can i get the videos for Starting Methods Of Induction Motor?
By:
Dasarathy
Date:
2012-11-02
The co-ordinator will post his answer
Question:
sir in dc machine we are connecting dc supply across field winding,then how we are getting flux and steady magnetic field?????because inductor act as short ckt when dc is applied na
By:
girija
Date:
2012-11-04
The co-ordinator will post his answer
Question:
respected sir, what about motivation stuff and things that make study a fun.
By:
er. sanjay kumar
Date:
2012-11-04
The co-ordinator will post his answer
Question:
sir i want to know that in dc excitation system why we use two exciter main and pilot. why we cant feed output of one exciter to directly feed to field winding of alternator
By:
kunal harsh
Date:
2012-11-12
The co-ordinator will post his answer
Question:
sir i want to know that in dc excitation system why we use two exciter main and pilot. why we cant feed output of one exciter to directly feed to field winding of alternator
By:
kunal harsh
Date:
2012-11-12
The co-ordinator will post his answer
Question:
Is Machine I & II syllabus of NPTEL complete the whole subject?
By:
Shyamal
Date:
2012-11-18
The co-ordinator will post his answer
Question:
what is the relation between load angle & frequency in synchronous motor???if f increased 10% ,then what happen in load angle??
By:
subham aditya
Date:
2012-11-27
The co-ordinator will post his answer
Question:
explain about the failure northern grid due to mismatch of demandand output
By:
c.manju nath venkata
Date:
2012-11-30
The co-ordinator will post his answer
Question:
consider an d.c generator,where no external load is connected,what is the converted form of mechanical energy,as no electrical energy is delivered? what about law of conversation of energy?
By:
c.manju nath venkata
Date:
2012-11-30
The co-ordinator will post his answer
Question:
smart grid system
By:
mahmoud ibrahim el desouki
Date:
2012-12-01
The co-ordinator will post his answer
Question:
RESPECTED SIR , I am student of electrical engineering from Pakistan. Pakistani students are deeply impressed with your quality of education. Unfortunately we don't have such qualified faculty in our country. Sir can you please arrange a separate topic on STEPPER MOTORS in future lectures?
By:
SAAD
Date:
2013-02-05
The co-ordinator will post his answer
Question:
thanks for uploading this great series . please upload machines 2 as soon as possible. and is induction motor is uploaded in part 2 . thank you very much again sir.
By:
Date:
2013-02-05
The co-ordinator will post his answer
Question:
can u offer sppeed control using advance power electronics...
By:
prashant agrawal
Date:
2013-02-09
The co-ordinator will post his answer
Question:
how to explain three phase induction motor?
By:
priya
Date:
2013-03-16
The co-ordinator will post his answer
Question:
dear sir why inductor dosent allow sudden change in current?
By:
gopal
Date:
2013-03-26
The co-ordinator will post his answer
Question:
why syn reactance change during short circuits?
By:
gopal
Date:
2013-03-26
The co-ordinator will post his answer
Question:
sir why the field resistance is below the critical resistance in a shunt generator?
By:
Biswesh Sharma
Date:
2013-04-04
The co-ordinator will post his answer
Question:
Sir what is the difference between armature winding and field winding in DC rotating machine
By:
SHAILESH
Date:
2013-04-05
The co-ordinator will post his answer
Question:
Sir what is the difference between armature winding and field winding in DC rotating machine
By:
SHAILESH
Date:
2013-04-05
The co-ordinator will post his answer
Question:
By:
SHAILESH
Date:
2013-04-05
The co-ordinator will post his answer
Question:
how to clear the gate exam
By:
krishna
Date:
2013-05-02
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Question:
what is the main constructional difference in generator and motor?
By:
krishna
Date:
2013-05-02
The co-ordinator will post his answer
Question:
why alternator,generator,synchronous motor field is excited by dc only why not ac
By:
nagarjuna
Date:
2013-05-10
The co-ordinator will post his answer
All Questions for this Course
Question:
thanx a lot for uploading this.!!waiting eagerly for electrical machines part 2.
By:
levicorpus
Date:
2012-07-11
The co-ordinator will post his answer
Question:
sir can you offer MCQ ...
By:
gopal
Date:
2012-07-12
The co-ordinator will post his answer
Question:
sir when will electrical machines-2 uploaded
By:
gopal
Date:
2012-07-12
The co-ordinator will post his answer
Question:
I take this opportunity to thank you you uploading this series on Electrical machine.At around time 50:00 min you have mentioned the direction of current in the coil in downward direction mentioning that its obvious.The fundamental behind is not clear to me.If you can explain,it will help.
By:
Rishi
Date:
2012-07-12
The co-ordinator will post his answer
Question:
Sir,will the induction machine portion be covered in electrical machines 2? As when i am checking the syllabus,it shows that dc machine is to be covered in part 2 whereas induction machine in part 1.however the contents seem to interchanged..is it??jst wanted to be assured!!
By:
levicorpus
Date:
2012-07-13
The co-ordinator will post his answer
Question:
the load current is minimum only if (iff) i1 and i2 are out of phase and not in phase unlike what was said. Sir , please clearify (really) soon..??
By:
erc
Date:
2012-07-16
The co-ordinator will post his answer
Question:
in lecture 8,prof. kastha mentions that it is preferable to do no-load test in a 1-phase transformer by applying the voltage across a variac rather than a large supply with resistance in series to drop the extra voltage just bcoz hysteresis loop in later case leading to large current peak(harmonic)
By:
levicorpus
Date:
2012-07-17
The co-ordinator will post his answer
Question:
(continuing from last question..)but even if one applies supply voltage with a variac then also due to nonlinear nature of transformer core,currents do turn nonsinusoidal and large current peak occur thru 3rd harmonic summation.so how doing no load test with variac on this ground is justified?
By:
levicorpus
Date:
2012-07-17
The co-ordinator will post his answer
Question:
*sorry,it will be lecture 9
By:
levicorpus
Date:
2012-07-17
The co-ordinator will post his answer
Question:
it will be a great help if the lectures on synchronous and induction m/c can be uploaded.please upload electrical machine -II SOON.IS LOST WITHOUT IT.
By:
ranojay
Date:
2012-07-19
The co-ordinator will post his answer
Question:
what does phase practically means?how can we get feel phase whether it is 2phase ,3phase,sixphase.....etc?
By:
pranav manavat
Date:
2012-07-21
The co-ordinator will post his answer
Question:
why transformer ratings are in KVA rather in KW?
By:
pranav manavat
Date:
2012-07-21
The co-ordinator will post his answer
Question:
sir,it would be very helpful to every ee student, if further video course on electrical machines is also uploaded,
By:
rakesh92
Date:
2012-07-22
The co-ordinator will post his answer
Question:
Sir Please clear the fundamental when a current is flow in downward to upward direction in plain paper ,then how we can define N & S poles? and In the last minutes of lectures how we can find the direction of current in field windings
By:
Ravi Prasad
Date:
2012-07-25
The co-ordinator will post his answer
Question:
Please upload electrical machines - II lectures
By:
Rizwan
Date:
2012-08-01
The co-ordinator will post his answer
Question:
nnnnnnnnnnnnnnn
By:
viswanathan
Date:
2012-08-03
The co-ordinator will post his answer
Question:
sir is it possible for generating power by using circular magnets, construction wise both the stator and rotor are in magnet like our induction motor
By:
viswanathan
Date:
2012-08-03
The co-ordinator will post his answer
Question:
Why transformer is rated in Kva ? please answer this question
By:
Muhammad Wajid Sarwar
Date:
2012-08-04
The co-ordinator will post his answer
Question:
why is there no reply to any posts???atleast inform us when machine 2 lectures will be uploaded...that way we can be sure whether it is before GATE 2013 or not!!
By:
ranojay
Date:
2012-08-07
The co-ordinator will post his answer
Question:
sir ,how to purchase thids electrical machine1......video cd........... c.d are copy right proctected or not
By:
abhishek
Date:
2012-08-08
The co-ordinator will post his answer
Question:
What will happen when direction of field current is changed (i.e, field excitation is reversed) in the following machines? 1) Alternator 2) Synchronous Motor 3) D.C Generator ( Shunt or Seies ) 4) D.C Motor ( Shunt or Seies )
By:
Somenath Das
Date:
2012-08-09
The co-ordinator will post his answer
Question:
how capacitor opposes change of voltage?
By:
shilpi
Date:
2012-08-10
The co-ordinator will post his answer
Question:
example of linear and non linear element with explanation?
By:
shilpi
Date:
2012-08-10
The co-ordinator will post his answer
Question:
why inductor do not change currentand capacitor do not change voltage instanteneously
By:
shilpi
Date:
2012-08-10
The co-ordinator will post his answer
Question:
Please upload the Electrical Machines -II. Thank you for your considerations. How can we order the course DVDs?
By:
Mehrdad
Date:
2012-08-13
The co-ordinator will post his answer
Question:
I am interested in practical winding motors. Could you please provide me some books which mane subject is armature winding. thanks
By:
Hassan
Date:
2012-08-27
The co-ordinator will post his answer
Question:
can you please tell 1.what is meant by induction? 2.what is the difference between induction and conduction motor ? thanks & regards, suba
By:
SUBA
Date:
2012-08-27
The co-ordinator will post his answer
Question:
what is relation between field excitation and reactive power in 3 phase synchronous generator ?? how reactive power changes with change in field current??
By:
Puran Dhakrey
Date:
2012-09-01
The co-ordinator will post his answer
Question:
we have find vth then why we have find E1.??
By:
Ankit singh
Date:
2012-09-09
The co-ordinator will post his answer
Question:
since we know our houses r supplied with ac if ac changes its magnitiude and direction per cycle... then there should be reversal of terminals for every cycle na.. but its not happening as nuetral is supplied seperately to houses.....wich means there is a zero potential always......?
By:
vishnu reddy
Date:
2012-09-16
The co-ordinator will post his answer
Question:
since we know there is a generator action in motor with wich back emf is produced y dont we talk about motor action in generator however current carrying conductors r in magnetic feild.....?
By:
vishnu reddy
Date:
2012-09-16
The co-ordinator will post his answer
Question:
Respected Sir,Please guide for derivation of inrush current equation of three phase transformer?
By:
Ashish Vinodrao Joshi
Date:
2012-09-18
The co-ordinator will post his answer
Question:
sir please tell if we connect capacitor in series with series fiel motor then what would be its impact on the motor speed and performance?
By:
sheetanshu
Date:
2012-09-21
The co-ordinator will post his answer
Question:
about magnetising inrush in transformer
By:
roshan
Date:
2012-10-06
The co-ordinator will post his answer
Question:
what is magnetising inrush in transformer ?
By:
roshan
Date:
2012-10-06
The co-ordinator will post his answer
Question:
Is it possible to generate power without any harmonics?
By:
sathya
Date:
2012-10-06
The co-ordinator will post his answer
Question:
How to calculate time constant of any circuit in PSPiCE?
By:
sathya
Date:
2012-10-06
The co-ordinator will post his answer
Question:
what is the difference between alternator and syvchronous motor ohasor diagram?
By:
Date:
2012-10-09
The co-ordinator will post his answer
Question:
Can i get the videos for Starting Methods Of Induction Motor?
By:
Dasarathy
Date:
2012-11-02
The co-ordinator will post his answer
Question:
sir in dc machine we are connecting dc supply across field winding,then how we are getting flux and steady magnetic field?????because inductor act as short ckt when dc is applied na
By:
girija
Date:
2012-11-04
The co-ordinator will post his answer
Question:
respected sir, what about motivation stuff and things that make study a fun.
By:
er. sanjay kumar
Date:
2012-11-04
The co-ordinator will post his answer
Question:
what Equivalent Circuits of Single Phase Transformers
By:
mukesh jangra
Date:
2012-11-09
The co-ordinator will post his answer
Question:
how tha connection are made Three Phase Transformer
By:
mukesh jangra
Date:
2012-11-09
The co-ordinator will post his answer
Question:
Please explain the configuration of a coil in an AC/synchronous machine. Also, I read somewhere that the length of coil side is 1/2 B-wavelength. How and what does it mean? Book referred was ElectricMachines by DP KOTHARI
By:
Shrey
Date:
2012-11-09
The co-ordinator will post his answer
Question:
what will happen if supply frequency is increased to 500Hz in transformer
By:
naveen ranjan
Date:
2012-11-10
The co-ordinator will post his answer
Question:
what will happen if frequency is decreased to 2hz
By:
naveen ranjan
Date:
2012-11-10
The co-ordinator will post his answer
Question:
sir i want to know that in dc excitation system why we use two exciter main and pilot. why we cant feed output of one exciter to directly feed to field winding of alternator
By:
kunal harsh
Date:
2012-11-12
The co-ordinator will post his answer
Question:
sir i want to know that in dc excitation system why we use two exciter main and pilot. why we cant feed output of one exciter to directly feed to field winding of alternator
By:
kunal harsh
Date:
2012-11-12
The co-ordinator will post his answer
Question:
Is Machine I & II syllabus of NPTEL complete the whole subject?
By:
Shyamal
Date:
2012-11-18
The co-ordinator will post his answer
Question:
what is the relation between load angle & frequency in synchronous motor???if f increased 10% ,then what happen in load angle??
By:
subham aditya
Date:
2012-11-27
The co-ordinator will post his answer
Question:
explain about the failure northern grid due to mismatch of demandand output
By:
c.manju nath venkata
Date:
2012-11-30
The co-ordinator will post his answer
Question:
consider an d.c generator,where no external load is connected,what is the converted form of mechanical energy,as no electrical energy is delivered? what about law of conversation of energy?
By:
c.manju nath venkata
Date:
2012-11-30
The co-ordinator will post his answer
Question:
smart grid system
By:
mahmoud ibrahim el desouki
Date:
2012-12-01
The co-ordinator will post his answer
Question:
If the field winding of an unloaded dc shunt motor gets opened while running,how will it affect the speed,Torque,Back Emf? Please reply soon.
By:
Ashutosh
Date:
2013-01-15
The co-ordinator will post his answer
Question:
why the shunt field winding of a DC shunt motor has more turns
By:
Abhilash
Date:
2013-01-16
The co-ordinator will post his answer
Question:
why DC shunt motors are used in centrifugal and reciprocating pumps why not other pumps are not used
By:
Abhilash
Date:
2013-01-16
The co-ordinator will post his answer
Question:
what is the effect of increasing or decreasing the core dimension of a transformer on its rating
By:
shoeb ashraf
Date:
2013-01-24
The co-ordinator will post his answer
Question:
current direction given how we can find the direction of magnetic field in a coil. I know flemings rule but..
By:
Deepak Mishra
Date:
2013-01-28
The co-ordinator will post his answer
Question:
RESPECTED SIR , I am student of electrical engineering from Pakistan. Pakistani students are deeply impressed with your quality of education. Unfortunately we don't have such qualified faculty in our country. Sir can you please arrange a separate topic on STEPPER MOTORS in future lectures?
By:
SAAD
Date:
2013-02-05
The co-ordinator will post his answer
Question:
thanks for uploading this great series . please upload machines 2 as soon as possible. and is induction motor is uploaded in part 2 . thank you very much again sir.
By:
Date:
2013-02-05
The co-ordinator will post his answer
Question:
What will happen if speed & excitation are changed in dc shunt generator in no load test?
By:
VIKASH KUMAR
Date:
2013-02-05
The co-ordinator will post his answer
Question:
can u offer sppeed control using advance power electronics...
By:
prashant agrawal
Date:
2013-02-09
The co-ordinator will post his answer
Question:
how to explain three phase induction motor?
By:
priya
Date:
2013-03-16
The co-ordinator will post his answer
Question:
Sir, a transformer cannot be shorted on its secondary. We call an induction motor as a rotating transformer. But, how does it hold in case of a squirrel cage induction motor whose secondary is shorted?
By:
Siddhartha
Date:
2013-03-21
The co-ordinator will post his answer
Question:
dear sir why inductor dosent allow sudden change in current?
By:
gopal
Date:
2013-03-26
The co-ordinator will post his answer
Question:
why syn reactance change during short circuits?
By:
gopal
Date:
2013-03-26
The co-ordinator will post his answer
Question:
the field resistance is fixed lie 50 ohm but when we plot occ then the corresponding voltage and field current gives the field resistance so can you expain how come the field resistance varies?
By:
Kishen
Date:
2013-03-30
The co-ordinator will post his answer
Question:
sir why the field resistance is below the critical resistance in a shunt generator?
By:
Biswesh Sharma
Date:
2013-04-04
The co-ordinator will post his answer
Question:
Sir what is the difference between armature winding and field winding in DC rotating machine
By:
SHAILESH
Date:
2013-04-05
The co-ordinator will post his answer
Question:
Sir what is the difference between armature winding and field winding in DC rotating machine
By:
SHAILESH
Date:
2013-04-05
The co-ordinator will post his answer
Question:
By:
SHAILESH
Date:
2013-04-05
The co-ordinator will post his answer
Question:
tell me why 3 phase
By:
rajan
Date:
2013-04-08
The co-ordinator will post his answer
Question:
how to clear the gate exam
By:
krishna
Date:
2013-05-02
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Question:
what is the main constructional difference in generator and motor?
By:
krishna
Date:
2013-05-02
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Question:
ajxka
By:
Aabir Chowdhury
Date:
2013-05-04
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Question:
When brush is shifted from GNA to MNA to reduce AR, the arm. mmf also shifts (180 degree to brush axis) which in turn shifts the resultant mmf as the arm. mmf has shifted which result in shifting of MNA again, but that does not happen. WHY??
By:
Aabir Chowdhury
Date:
2013-05-04
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Question:
why alternator,generator,synchronous motor field is excited by dc only why not ac
By:
nagarjuna
Date:
2013-05-10
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Question:
why we not use other type of core like aluminium irrespective of crgo core in transformer?
By:
sandeep dwivedi
Date:
2013-05-17
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