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.

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