Every power transformer carries a vector group listed by its manufacturer. Fundamentally it tells you the information about how the windings are connected (delta or wye) and the phase difference between the current and voltage. EG. DYN11 means Delta primary, Wye Secondary and the current is at 11 o clock referred to the voltage.
Thursday, January 30, 2014
In the motors starting purpose why the armature rheostats at maximum position while the field rheostat is kept in minimum position?
In the time of starting a motor the field rheostat is kept in minimum state for the high starting torque.
In the time of starting a motor the armature rheostats is used to control or reduce the high starting current. This high starting current can damage the motors starting systems.
In the time of starting a motor the armature rheostats is used to control or reduce the high starting current. This high starting current can damage the motors starting systems.
Name power losess in rotating electrical machines.
Power losess in rotating electrical machines are Copper losses, core losses, mechanical losses and stray losses.
Name the different types of motors used in vacuum cleaners, phonographic appliances, vending machines, refrigerators, rolling mills, lathes, power factor improvement and cranes
• Vacuum cleaners- Universal motor.
• Phonographic appliances – Hysteresis motor.
• Vending machines – Shaded pole motor.
• Refrigerators – Capacitor split phase motors.
• Rolling mills – Cumulative motors.
• Lathes – DC shunt motors.
• Power factor improvement – Synchronous motors.
• Phonographic appliances – Hysteresis motor.
• Vending machines – Shaded pole motor.
• Refrigerators – Capacitor split phase motors.
• Rolling mills – Cumulative motors.
• Lathes – DC shunt motors.
• Power factor improvement – Synchronous motors.
Advantages of speed control using thyristor
1. Fast Switching Characterstics than MOSFET, BJT, IGBT
2. Low cost
3. Higher Accuracy.
2. Low cost
3. Higher Accuracy.
4. Low power consumption. The drive is voltage controlled one rather then rheostat control.So power loss will be reduced which will improve the efficiancy
5. Easy Operation
6. No rotating parts
7. Smoother control can be possible unlike step variation in the speed in the general rheostat control
8. Wide range of control is possible with the provision of firing angle control
9.Ssize of controller will be small and the heat dissipation provisions are also not much larger as in case of rheostat controllers.
10. With the advancement of electronic devices its manufacturing cost is very much reduced so will be cheaper than the rheostatic.
Sunday, January 26, 2014
Engineering Service Examination (ESE) 2013 Interview Experience - Electrical Engineering-5
EE interview:
CP : Chairperson ( DEWAN Sir) M1, M2 , M3 : three members
CP:
1 how many national parks can you name in india . ( Question picked from my DAF where a NP was mentioned )
2 Can u draw the map of india
3. Mark port blair in d map.Distance from mainland ? (Diwan sir is from navy . This justifies questions from ports and sea distance )
4 Mark as many ports on the west coast of india
5 Give details of women reservation bill
6 Which lady apart from political would be your role model
7 What olympic medal did Mary kom win and when?
M1
1 How many chapters are there in Bhagwad Gita ? ( hobby - reading bhagvad gita as it is frm ISKON)
2 Name all chapters of Gita
3 Two chapters that according to you are the essense of Gita
4 Have you done any training ? Elaborate
5 Test done on transformers to ensure their proper working?
6 Explain how oil test is done
7 what all equipments are found in switchyard?
8 If you had a switchyard and a substation what changes would you do to improve it
M2
1 What was your final year project on?( Matlab ANN)
2 Why did you chose matlab?
3 What is artificial intelligence?
4 What is ANN
5 Importamce of synapses?
6 What activation function you used in your project and why?
7 Training methods of ANN?
8 full form of IEEE?( Vice chairman of ieee chapter in college)
9 Its Branches?
10 What you organized in your IEEE student chapter and how many members wer there? fee?
M3
1 why 11 kv is used for generation?
2 What is cyber crime? ( Had won gold medal in national cyber olympiad)
CP interrupts .. What is recent cyber crime of international level that took place and who revealed it?
3 How would you instruct someone regarding cyber security through a seminar?
4 Importance of earth wire?
5 List some instructions you would give to a person regarding care that has to be taken while handling and using electrical equipment /electricity?
CP: In railways one is posted in very remote locations also. If you are selected will you be able to manage?
PS :
My interview was very general nature an not very theoretical qns wer asked. While others were asked the same.
The board was cordial though but they were also putting up situations where it was easy to lose ones cool and easyness. They were probably testing personality traits through that.
Questions were repeated in same panel as my friend and me interviewd on same day same panel had 2 similar qns.
UPSC members are some of the finest people one can come across and its hard to pretend to be someone you are not in front of them ( unless one is extreamly good at pretending). So honesty is the best policy.
Prepare from the background of panel members too.
DAF is your bible for interview. Prepare thoroughly from that. Expect indirect questions from that too. Example in my case - cyber olympiad->cyber crime-recenylt crime of international level and exposer?
Interview is a lot of luck and depends on board too.
All the best to future aspirants!
CP : Chairperson ( DEWAN Sir) M1, M2 , M3 : three members
CP:
1 how many national parks can you name in india . ( Question picked from my DAF where a NP was mentioned )
2 Can u draw the map of india
3. Mark port blair in d map.Distance from mainland ? (Diwan sir is from navy . This justifies questions from ports and sea distance )
4 Mark as many ports on the west coast of india
5 Give details of women reservation bill
6 Which lady apart from political would be your role model
7 What olympic medal did Mary kom win and when?
M1
1 How many chapters are there in Bhagwad Gita ? ( hobby - reading bhagvad gita as it is frm ISKON)
2 Name all chapters of Gita
3 Two chapters that according to you are the essense of Gita
4 Have you done any training ? Elaborate
5 Test done on transformers to ensure their proper working?
6 Explain how oil test is done
7 what all equipments are found in switchyard?
8 If you had a switchyard and a substation what changes would you do to improve it
M2
1 What was your final year project on?( Matlab ANN)
2 Why did you chose matlab?
3 What is artificial intelligence?
4 What is ANN
5 Importamce of synapses?
6 What activation function you used in your project and why?
7 Training methods of ANN?
8 full form of IEEE?( Vice chairman of ieee chapter in college)
9 Its Branches?
10 What you organized in your IEEE student chapter and how many members wer there? fee?
M3
1 why 11 kv is used for generation?
2 What is cyber crime? ( Had won gold medal in national cyber olympiad)
CP interrupts .. What is recent cyber crime of international level that took place and who revealed it?
3 How would you instruct someone regarding cyber security through a seminar?
4 Importance of earth wire?
5 List some instructions you would give to a person regarding care that has to be taken while handling and using electrical equipment /electricity?
CP: In railways one is posted in very remote locations also. If you are selected will you be able to manage?
PS :
My interview was very general nature an not very theoretical qns wer asked. While others were asked the same.
The board was cordial though but they were also putting up situations where it was easy to lose ones cool and easyness. They were probably testing personality traits through that.
Questions were repeated in same panel as my friend and me interviewd on same day same panel had 2 similar qns.
UPSC members are some of the finest people one can come across and its hard to pretend to be someone you are not in front of them ( unless one is extreamly good at pretending). So honesty is the best policy.
Prepare from the background of panel members too.
DAF is your bible for interview. Prepare thoroughly from that. Expect indirect questions from that too. Example in my case - cyber olympiad->cyber crime-recenylt crime of international level and exposer?
Interview is a lot of luck and depends on board too.
All the best to future aspirants!
Engineering Service Examination (ESE) 2013 Interview Experience - Mechanical-3
Mech engg. Panel 4
Chairperson(ch). Chattar Singh
1. About job profile ( as i m in Ongc)2. Place of posting nd my experience 3. Gas nd oil quality control measures.3. Diff parameters of crude oil to be tkn in to consideration.
Panel 2. Diff bw fuel nd battery., convective heat transfer, adiabatic reversible nd isentropic process diff,
3rd person. How to measure the water content in diesel nd its effect on engine. Performance.
4th person. Tolerance, allowance diff bw them, hole nd shaft Basis system, why these two systems nd there application in industry., diff types of fits ,
CH.: abt my hobby .....
Thank you ur int z over...
Chairperson(ch). Chattar Singh
1. About job profile ( as i m in Ongc)2. Place of posting nd my experience 3. Gas nd oil quality control measures.3. Diff parameters of crude oil to be tkn in to consideration.
Panel 2. Diff bw fuel nd battery., convective heat transfer, adiabatic reversible nd isentropic process diff,
3rd person. How to measure the water content in diesel nd its effect on engine. Performance.
4th person. Tolerance, allowance diff bw them, hole nd shaft Basis system, why these two systems nd there application in industry., diff types of fits ,
CH.: abt my hobby .....
Thank you ur int z over...
Engineering Service Examination (ESE) 2012 Interview Experience - Civil Engieering - 3
date of interview-15th jan 2014 at 4.00 to 4:20 pm
branch-civil
board-AP singh
1.why u want to leave da job frm UPRVUNL
2.why u want to go in railways
?
3. Wat is diamond crossing
member1- 1.what is quick sand and based on this he asked 10 ques like piping,effective stress, how to overcum frm this situation at site and wich typ of filters may b provided for its nd wat size of particles can b retaind and frm these filters nd filters used in water resourece wat r da differences....i ans most of da ques except size of particles..
Member 2-from job ....how u do da strength chek for cement and wat is da size of cube2.how u chek da strnth of concrete at site nt in da lab
3.viats apparatus k baare me batao
4.machines used at
construction site?
5.how materials r feed in batching plant and wat is da use of silo?
6-what is da grade of concrete used at ur site?
I ans all of these
member 3-wat is retaining wall explain why it is used and askd many qus on this....
I ans most of his ques
head -
from hobby-wat does exactly sudoku means?
2.ques frm history of sukoku frm wher it cum in world nd yr etc ?
3.frm wher u solve dis nd name of news paper.......
Now u may go and i came out wid my satisfactory intrw ....
branch-civil
board-AP singh
1.why u want to leave da job frm UPRVUNL
2.why u want to go in railways
?
3. Wat is diamond crossing
member1- 1.what is quick sand and based on this he asked 10 ques like piping,effective stress, how to overcum frm this situation at site and wich typ of filters may b provided for its nd wat size of particles can b retaind and frm these filters nd filters used in water resourece wat r da differences....i ans most of da ques except size of particles..
Member 2-from job ....how u do da strength chek for cement and wat is da size of cube2.how u chek da strnth of concrete at site nt in da lab
3.viats apparatus k baare me batao
4.machines used at
construction site?
5.how materials r feed in batching plant and wat is da use of silo?
6-what is da grade of concrete used at ur site?
I ans all of these
member 3-wat is retaining wall explain why it is used and askd many qus on this....
I ans most of his ques
head -
from hobby-wat does exactly sudoku means?
2.ques frm history of sukoku frm wher it cum in world nd yr etc ?
3.frm wher u solve dis nd name of news paper.......
Now u may go and i came out wid my satisfactory intrw ....
Engineering Service Examination (ESE) 2012 Interview Experience - Civil Engieering - 2
20th jan,2014....civil branch
Board :- alka sirohi mam
ch - what kind of books do you read?(answer-recently read= my experiments with truths by mahatma gandhi)what is the message you got from this book? recently it was said in south africa that you gave us gandhi and we gave you mahatma.do you agree with it?what is apartheid?
m1- what is the difference between national and international system in chess?(my hobby is chess)suppose one knight moves two squares vertically and one square horizontally ,how will it get denoted by the computer?what is your favorite subject?(ans -som , geotech)what is the difference between compaction and consolidation?when raft foundation is used?when pile foundation is used?how will you measure the ultimate load that can be bear by pile?is there any contribution by shaft?what is scaffolding?what are your other favourite subjects?(ans-concrete and steel)what is the effect of water cement ratio?suppose one sample has water cement ratio as .4 and other has .8,which will have more strength?is there any engineering reason?
m2- how will you measure bearing capacity of soil?explain the method of plate load test?what is the unit in which answer come?what is the size of plate?what are the consistency limits?what is liquid limit,plastic limit,plasticity index?suppose a soil has plasticity index as 40,will it be suitable?
m3- what is narmada sewer project?what is its effects?what is duty and delta?
ch(again)-what energy transformations take place in hydroelectric power plant?
Board :- alka sirohi mam
ch - what kind of books do you read?(answer-recently read= my experiments with truths by mahatma gandhi)what is the message you got from this book? recently it was said in south africa that you gave us gandhi and we gave you mahatma.do you agree with it?what is apartheid?
m1- what is the difference between national and international system in chess?(my hobby is chess)suppose one knight moves two squares vertically and one square horizontally ,how will it get denoted by the computer?what is your favorite subject?(ans -som , geotech)what is the difference between compaction and consolidation?when raft foundation is used?when pile foundation is used?how will you measure the ultimate load that can be bear by pile?is there any contribution by shaft?what is scaffolding?what are your other favourite subjects?(ans-concrete and steel)what is the effect of water cement ratio?suppose one sample has water cement ratio as .4 and other has .8,which will have more strength?is there any engineering reason?
m2- how will you measure bearing capacity of soil?explain the method of plate load test?what is the unit in which answer come?what is the size of plate?what are the consistency limits?what is liquid limit,plastic limit,plasticity index?suppose a soil has plasticity index as 40,will it be suitable?
m3- what is narmada sewer project?what is its effects?what is duty and delta?
ch(again)-what energy transformations take place in hydroelectric power plant?
Saturday, January 11, 2014
The Constituent Assembly Of India Was Created Under:- (ESE 2013)
- Cripps Proposals
- Cabinet Mission Plan
- Simla Agreement
- Mountbatten Recommendations
Who among the following is credited with the introduction of local self government in India? (ESE 2013)
- Lord Mayo
- Lord Ripon
- Lord Lytton
- Lord Curzon
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