IOCL Electrical Interview Preparation

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IOCL(GD, GT, PI)

Dear IOCL interview aspirants,

IOCL is one the maharatnacompany ,IOCL invites the candidates who got clear their GATE exam. The very important subjects for EE interview are Electrical machines, Power systems ,Powerelectronics and Electrical measurements. The below are the previously asked questions in the IOCL interview.YourPedia is the largest and best platform for mentoring students for various interview preparation. YourPedia offers a very good module for your interview preparation. This module contains unlimited snaps(snap is 10 min interview with individual subject experts) with faculties and full mock interviews(mock interview is similar to the actual interview conducted by IOCL). At the end of the snaps and mocks mentors provide you with feedback, suggestions and improvements which is very important.

IOCL Electrical Interview Questions



  • Significance of V and inverted V curves?

  • Relays used in transformer protection?

  • Explain Buchholz relay?

  • Use of silica gel in transformer?

  • Differential protection?

  • Different transformer connections?

  • Explain CT connections for protection?

  • Hysterisis and eddy current losses and how to minimize?

  • Transformer oil ? purposes?

  • OLTC?

  • What is Synchronous condenser?

  • How to increase torque in Slip ring induction motor?

  • What is the difference between Alternator and Induction generator?

  • Purpose of classifying Transmission lines?

  • Different transmission voltage levels?

  • Different types of conductors used in transmission and distribution ?

  • Advantages of and disadvantages of AC and DC transmission ?

  • Purpose of transposition of transmission lines?

  • What is corona and what is corona loss?

  • Positive, negative and zero sequence impedance of a line transmission line?

  • Installed capacity and average load in India?

  • Thermal power plant basics?

  • What is economiser?

  • What Air preheater?

  • What are various equipment in switch yard?

  • What is switch gear?

  • Various equipment in sub station?

  • Explain Bus bar, surge arrester, CT, PT, CVT, Circuit breaker, Lightning Arrester, switches / Isolator, Insulator, Busbar?

  • Different CT for protection and metering?

  • Explain Circuit breaker operation?

  • What are auto-reclose type circuit breaker?

  • What is Arc quenching?

  • Why we try to extinguish the arc at current zero?

  • How much time does it usually take for a CB to break the circuit?

  • What is the suppression time and break time of a CB?

  • How can we improve the transient stability of a system?

  • What PLCC?

  • Insulation resistance?

  • Earthing resistance?

  • Explain skin effect, Ferranti effect , proximity effect?

  • Parallel operation of generators?

  • How will you measure frequency?

  • why harmonics and how to eliminate harmonics?

  • What PLC?

  • What SCADA?

  • What Smart grid and how it differs from conventional grid?

  • What are the advantage &disadvantages of HVDC?

  • What are the devices connected at terminal of HVDC or converting substation?

  • Method of Neutral grounding?

  • How can we solve the unbalanced system problem in power system?

  • How can we differentiate between symmetrical and asymmetrical faults?

  • Define steady state stability limit and transient stability limit?

  • Why after steady state stability limit the synchronism will loose?

  • Among steady state stability limit and transient stability limit which one is higher?

  • Given some methods to improve steady state stability limit?

  • How can we reduce reactance of the line?

  • What is the purpose of series of reactance?

  • What is the effect of series capacitor on fault current?

  • Why can’t we use hydel load plant?

  • Why thermal plant cannot be used as peak load plant?

  • Give some examples of base load and peak load plants?

  • How we categorize the power plant into base load and peak load plants?

  • What is the role of governor?

  • What is AVR (Automatic voltage regulator)?

  • What is Ferranti effect?

  • What are the advantages of ACSR conductors?

  • What are the advantages of HVDC over HVAC?

  • What is neutral grounding?

  • What are the methods?

  • What grounding is used for synchronous generator?

  • Why resistance grounding is preferred for synchronous generator?

  • Why reactance grounding is used for synchronous motor?

  • What is the power factor of an over excited synchronous generator?

  • What is the power factor of an under excited synchronous motor?

  • What is synchronous condenser?

  • What is synchronous coil?

  • What is synchronous phase modifier?

  • What is need of classification of transmission lines?

  • What is wave length of transmission line operating at 50Hz.

  • What are the performance indices of a transmission line?

  • Why receiving voltage is mentioned in the given data of a transmission line?

  • Distribution transformer winding sense and phasor groups?

  • Testing of transformer?

  • Why we use dy on distribution advantages of star on Distribution side?

  • Dielectric strength of oil before and after filtration which we use in transformer?

  • All Motors ( DC and AC) applications?

  • starting methods of different motors?

  • speed control of induction and dc motors?

  • What is VFD?

  • What is VVFD?



For any Query or to attend Mock Interview session, fill this form or feel free to call 98552-73076

For IOCL interview important topics from Electrical machines are Transformers, Induction motor and alternator, Important topics from Power systems are Power generation , transmission and protection, important topics from Power electronics are power electronic devices, rectifiers , choppers and inverters , important topics from Electrical measurement,PT,Energy meter, Power measurement etc. YourPedia is the best platform for interview preparation. Join your hands with YourPedia to accelerate your interview preparation.

50+ Actual IOCL GT Topics
1. You have to make a rural tourism hub near Delhi city for the urban people to experience village life. Make a whole plan for this tourism hub.
2. If you go on a cold desert, what things you will take with you. Make a list of 7 things.
3. You are a committee member and you have to eliminate the dowry system. What steps will you take?
4. You are in the top position of a company and you have to aware your workers about “Health is Wealth”. What steps will you take?
5. We have a large population but still our number of medals are less so how we can increase the number of medals in sports.
6. You have to setup a framework to reduce sexual harassment at your workplace.What steps you will take.
7. You have 10 engineers and you have to give them training in 7 days and you have a budget of 5 lakh so that they can work for a year. How will you allocate this budget?
8. You are an officer of IOCL and you have to plan a vacation for your staff including your CMD. What steps will you take?
9. You are in IOCL and have to increase the health index of your employee. What steps you will take.
10. We all are alumni of a college. Because of Covid our college is facing issues and our principal is seeking help from us to resolve the problem. So plan and budget for this.
11. You are working in a refinery and suddenly an explosion happens and you have no data connection or any other communication and there are around 100 members there including women, children and senior citizens. What steps you will take. (There is also another refinery nearby).
12. They give a white paper to everyone and we all have to make something on this paper but when we put this on their table, it should come out with some meaning or some creative thing.
13. You have to allocate funds to different sectors like defense, agriculture, education, health, Industries,politics etc.
14. You have funds for water conservation and saving water in urban areas. How will you use this money?
15. Delhi is a fast growing city. As a technical engineer how can you make this city good for living?
16. You are an IOCL manager and you are handling a project. Your team is having some non-technical issues like emotional and personal. How will you tackle this?
17. Our economy fell due to Covid. You are a government employee so you have to prepare some plan to improve this situation and increase rupee value.
18. Discuss about women safety. What additional measures should we take for women safety in India?
19. You are an IOCL employee. There is a garbage disposal problem in your society. What will you do for this?
20. How to increase our medals in next Olympics
21. What steps should the government take to reduce violence and harassment on women in rural areas.
22. What are problems in democracy and how can we manage the protests that happen in democracy?
23. Make 7 strategies in a short term manner to bring the Indian economy back from Covid
24. You have to conduct an online get together for students. How will you do this so that maximum students involve in this.
25. IIT have good rankings in India but in World ranking it is not that good. Suggest some points to the government to improve this.
26. How will you make a transmission line from Utrakhand to Bihar & UP rural areas.
27. If you are stuck in a dense forest. What 7 things you will choose for survival.
28. NPA are increasing day by day in India and common people are suffering because of this. You have to make steps to improve this.
29. We want to make India a popular travel destination after Covid. What steps you will take.
30. Give solutions for climate change and global warming.
31. How can renewable energy be used to move from darkness to light?
32. You are a member of a committee and you have to take some steps for Women empowerment.
33. A ship is sinking and there are 13 people there. You have 2-3 hours and to rescue 1 person it takes roughly 15 minutes. There are people of different age groups. What will be your order of saving people and why?
34. You are an IOCL executive. There are 1200 outlets in Rajasthan of IOCL. You have to increase the sales of these outlets as compared to its competitors. What steps you will take.
35. You are in lockdown phase-1. People are moving to their native places. Make a plan so that these people can reach their places while maintaining social distance.
36. We have 400 petrol pumps working in Rajasthan and you have increase their sales. Give your points for that.
37. You are an IOCL employee. You have to make your work environment Eco-friendly. What steps you will take.
38. You are an IOCl employee, what steps you will take to take strong feedback from your customers about your products.
39. How can unemployed youth of India be made skillful?
40. You have to make a hit bollywood film. What will be three important for this and what should be their proportion.
41. You are a member of a committee and you have to plan something for the welfare of the youth of Kashmir. Give your points.
42. You are in the BCCI.You have to take care of your players in this Covid time but at the same time you have to earn money as well. What steps you will take to make a balance in both.
43. You have to divide 100 rupee in household work according to work priority.
44. The Supreme court passed a judgment that employees don’t have the right to choose their posting location.It is the employer's decision. Now you are CEO of IOCL. You have to develop a posting system in IOCL.
45. Discuss points how BCCI can increase its revenue during Covid and how can we encourage our players as they have to travel Covid and they can’t meet anyone.
46. Upper management(Us) and labor (them). This Us vs them is creating anger and issues in the labor class(them). You're an IOCL officer, what will you do?
47. You are a NGO team member and working in a village. Here girls are not comfortable in going to school as school is situated outside of the village. You have to plan something to increase the girl education in this area.
48. You are a civil engineer and you have to make a high rise building with commercial in the bottom and then institutional. Make sure it is a green building.
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