5 Petrofac Commissioning Field Operator Interview Questions & Answers | Complete Prep Guide 2025

Petrofac Commissioning Field Operator Interview Experiences

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Commissioning Field Operator Interview Questions & Answers

Anonymous

posted on 28 Dec 2019

Interview Questionnaire

5 Questions

Q1. What is saturated steam?

Ans.

Saturated steam is steam that is in equilibrium with liquid water at the same temperature and pressure.

Saturated steam is commonly used in industrial processes for heating and sterilization.
It is often produced by boiling water in a closed vessel, such as a boiler.
Saturated steam has a high heat content and can transfer heat efficiently.
It is important to control the quality of saturated steam to prevent damage to equi...

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Q2. ESDV levels?

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Q3. Process of before experienced plant

Ans.

I have experience in commissioning and operating various types of plants.

I have worked with oil and gas plants, chemical plants, and power plants.
I am familiar with the process of pre-commissioning, commissioning, and start-up of plants.
I have experience in troubleshooting and resolving issues during plant operations.
I am knowledgeable in safety procedures and regulations in plant operations.
I have worked with various ...

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Q4. Compressor startup procedures?

Ans.

Compressor startup procedures involve several steps to ensure safe and efficient operation.

Check oil levels and pressure
Inspect for leaks and damage
Open suction and discharge valves
Start motor and monitor for abnormal vibrations or sounds
Gradually increase speed and monitor pressure and temperature
Close bypass valve once operating conditions are stable

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Q5. How to monitor delta D on steam line?

Ans.

Delta D on steam line can be monitored using differential pressure transmitter.

Install a differential pressure transmitter across the steam line.
Calibrate the transmitter to measure the pressure difference between two points.
Convert the pressure difference to delta D using the known properties of the fluid.
Monitor the delta D reading regularly to detect any changes in the steam line.
Take corrective actions if the delta

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Cairn Energy

krishna chaitanya Konduri

posted on 2 Dec 2015

Interview Questionnaire

6 Questions

Q1. Tell me about your internships

Ans.

I have completed two internships, one in a software development company and the other in a manufacturing firm.

Interned as a software developer at XYZ Technologies for 6 months
Worked on developing a web application using ReactJS and NodeJS
Assisted in testing and debugging the application
Interned as a production engineer at ABC Manufacturing for 3 months
Assisted in the production process and quality control
Learned about ...

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Q2. Tell me about yourself ?

Ans.

I am a recent engineering graduate with a passion for problem-solving and innovation.

I graduated with a degree in Mechanical Engineering from XYZ University.
During my time at university, I completed several projects that involved designing and building prototypes.
I am proficient in CAD software such as SolidWorks and have experience with programming languages like Python.
I am a quick learner and enjoy working in a team...

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Q3. Tell me about your hobbies?

Ans.

I enjoy reading, playing sports, and exploring new places.

Reading books on various topics such as science fiction, biographies, and history
Playing basketball and badminton with friends
Traveling to new cities and trying local cuisine
Learning new languages and cultures through books and travel

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Q4. Tell me about 2 failures and how did you overcome them ?

Ans.

I failed to meet a project deadline and failed to secure an internship. I overcame them by learning from my mistakes and improving my skills.

Failed to meet a project deadline due to poor time management
Overcame it by creating a detailed schedule and prioritizing tasks
Failed to secure an internship due to lack of experience
Overcame it by taking online courses and gaining relevant skills
Learned from both failures and imp

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Q5. What were the other companies you are going to sit during your placements?

Ans.

I am sitting for placements in companies like ABC, XYZ, and PQR.

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Q6. Why Oil and gas sector?

Ans.

Oil and gas sector offers challenging work, global exposure, and opportunities for growth.

Oil and gas sector is a dynamic and constantly evolving industry.
It offers a wide range of challenging work, from exploration to production and refining.
Working in this sector provides global exposure and opportunities to work on projects in different parts of the world.
The sector offers opportunities for growth and career advance...

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Interview Preparation Tips

Round: Group Discussion
Experience: There were 10 candidates in each group and I guess there were around 5 such groups, and all are from chemical engineering department. Group discussion for the GG students were held separately. Duration of the group discussion was only 5 min and so each candidate will get a chance to speak for less than 1-2 min. During the GD I made good conclusion which was also supported by the whole group which gave an added advantage to my points. GD's with my batch mates really helped me because discussing with your friends gives you broader perspective, better understanding of the topics, get to to know your weaknesses, reduce fear and stress during the GD's.The Key is ' be confident, put relevant points and try to convince the group in a smart way'. FInally only 2 students from each group got shortlisted and around 12 students were selected for the final Technical & HR Interview.
Tips: Be updated with the recent topics and better to do some group discussions with your wing mates or batch mates. This really helped me. Do not shout in the GD, put your points in smart way and make a good conclusion... :)
Duration: 5 Min minutes

Round: Technical Interview
Experience: My Interview started with ' Tell me about yourself' and then they grilled me on my internships. I did my third year Intern in Haldia Petrochemicals Ltd. Q1. What are the different types of pumps and their parts? (Centrifugal, positive displacement pumps and their parts) Q2. Different types of valves and their application? (Like gate, globe, butterfly, Non return valves (NRV)- check valves, ball valves etc.) Q3. Calculation of pressure drop through a pipe in turbulent flow (Not hagen poiseuille equation,it is for Laminar flow)
Q4. Pinch temperature Q5. Temperature profiles for cold fluid and hot fluid in cocurrent and counter current heat exchanger. Q6. Advantages of counter current heat exchanger over co current heat exchanger. (Other than LMTD, Check DQ Kern)- Ans. Hot fluid outlet temperature can go below cold fluid inlet temperature in counter current HEx which is not possible in case of co current HEx.
Q7. JT Expansion. MY 4th year internship was in U of S, canada where I developed two processes for manufacturing of glycerol carbonate and propylene glycol using Aspen hysys. They asked me regarding mass, energy balance (utilities) involved in the process and how I applied pinch analysis for the processes.

Tips: Be Confident, Be completely prepared with your projects, should be strong in your core concepts and try to answer logically.

Round: HR Interview
Experience: These are all basic standard questions
Tips: Be yourself, state real life examples and make some good stories.

General Tips: Be positive, keep smiling and make proper plan for the placements and work accordingly.
Skills: Chemical Engineering Basics
College Name: IIT Kharagpur
Motivation: I am interested to pursue my career in core chemical engineering and CAIRN is one of the best options available in oil and gas industry.

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Cairn Energy

Anonymous

posted on 20 May 2017

I was interviewed in Oct 2016.

Interview Preparation Tips

Round: Resume Shortlist
Experience: The shortlist had 26 students and it was completely on the basis of OGPA
Tips: Maintain good grades throughout

Round: Group Discussion
Experience: Initially it was a bit chaotic but everyone calmed down in a few minutes. I gave in some good points ,others also contributed in a healthy discussion and we came to a common conclusion that whenever players come on to the field they give their 100%
Tips: Try to pitch in at the right moment with good points rather than constant blabbering
Duration: 20 minutes

Round: Technical + HR Interview
Tips: Stay Calm and answer confidently. Take time to revive and frame your answer properly. Do not be in a hurry

College Name: IIT ISM Dhanbad

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Cairn Energy

Anonymous

posted on 23 May 2017

Interview Preparation Tips

Round: Resume Shortlist
Experience: Conventional Resume Shortlisting

Round: Group Discussion
Duration: 20 minutes

Round: Technical + HR Interview
Experience: I will try and narrate the entire interview experience here. I1 refers to the technical interviewer, I2 refers to the HR interviewer and C refers to the interviewee (me)
I2: Good evening, So you interned in Schlumberger, what happened?
C: I did not get a PPO.
I2: But they came on campus, right?
C: Ya, but I did not get shortlisted.
I1 (surprised): They did not even shortlist you?
C: Initially, they did not but today morning I got a call again.
I2: Then, what happened?
C: I do not know, haven't checked the result.
I2: You did not even bother to check the result? Shows your utter disinterest in Schlumberger..
C: No, it shows my interest in Cairn India.

At this point, I2 got silenced and urged I1 to continue..

I1: So Kartik, tell us about your work in Schlumberger?
C: Explained him all the technical details, without divulging any confidential information.
I1: Can you tell me the block name?
C: No sir, I am not allowed to do so.
Please remember , questions like these are asked just to c

College Name: IIT Kharagpur

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Reliance Industries

Suyash Jain

posted on 14 Mar 2015

Interview Preparation Tips

Round: Resume Shortlist
Tips: Make a good Core Resume if you are targetting this company

Round: Test
Experience: The paper was same for Mechanical and Metallurgy students.
Tips: A basic understanding of the mechanics and the various material properties like elasticity, stress-strain curve etc. will help you a lot in clearing the test.

Round: HR Interview
Experience: It was good. Basic HR questions were asked and a few questions relating to the current affairs as well were asked.
Tips: Decent HR prep required.

Round: Technical Interview
Experience: Reasonably well.
Tips: In depth knowledge of the projects and technical work(s) mentioned in the resume/spoken of in the interview is necessary.

General Tips: Be Yourself, Have confidence, Have a thorough understanding of your field (as a lot is asked of it in the interview) with a decent HR preparation and Crack the Job.
Skills: Articulation skills, Technical Background, Understanding Ability, Confidence
College Name: IIT Bombay

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Reliance Industries

Navratan Kedia

posted on 27 Mar 2015

Interview Questionnaire

3 Questions

Q1. Tell me about ur project

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Q2. Asked ques from training(go through training properly)

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Q3. Ques from transformer , induction machine and its protection

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Interview Preparation Tips

Round: Test
Experience: It was fine...
Tips: Be fast and accurate...practice ques from R S Agarwal,for technical just take easy u have not mug up the things ques is quite easy.
Total Questions: 60

Round: Technical Interview
Experience: It was an half hour interview...I explained all the things in a proper manner.
Tips: Be calm and comfortable,go through ur resume in a proper manner.

General Tips: Believe in urself....cpi should be greater than 7
College Name: NIT ALLAHABAD
Motivation: It is an oil industry so it has a vast scope in future.
Funny Moments: Have a little discussion about Lalu prasad yadav

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Reliance Industries

Avinav Prakash

posted on 30 Mar 2015

Interview Questionnaire

12 Questions

Q1. 1. Some basic Qs on Fluid like: which pump would you use for high head? On what parameters efficiency of pump depend?

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Q2. 2. What were the unit operations used in the plant I did my summer training?

Ans.

The unit operations used in the plant during summer training.

Distillation
Filtration
Crystallization
Extraction
Drying
Mixing

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Q3. 3. A numerical on Black body radiation. There are 2 bodies one absorbing 0.4 of others’ energy and the other absorbing .6 by another. (I had solved the Q by view factor method)

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Q4. 4. Some Qs on design of heat exchanger. How would the heat transfer coefficient change when baffle spacing is changed? What are other such important factors?

Ans.

Heat transfer coefficient changes with baffle spacing in heat exchangers. Other important factors include fluid properties, flow rate, and surface roughness.

Heat transfer coefficient increases with decreasing baffle spacing
Fluid properties such as viscosity and thermal conductivity affect heat transfer
Higher flow rates can increase heat transfer coefficient
Surface roughness can affect heat transfer by creating turbulen

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Q5. 5. What is catalytic hydrocracking? And related Qs. Whether it is endothermic or exo?

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Q6. 6. What is the significance of Viscosity Index of lube?

Ans.

Viscosity Index of lube measures its resistance to change in viscosity with temperature.

Viscosity Index (VI) is an important property of lubricating oils.
It measures the oil's ability to maintain its viscosity under different temperature conditions.
Higher VI means the oil's viscosity changes less with temperature, indicating better performance.
VI is calculated using kinematic viscosity measurements at two different tem...

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Q7. What are the different kinds of distillation you know?

Ans.

Different kinds of distillation include simple distillation, fractional distillation, steam distillation, and vacuum distillation.

Simple distillation is used to separate liquids with different boiling points.
Fractional distillation is used to separate liquids with similar boiling points.
Steam distillation is used to extract essential oils from plants.
Vacuum distillation is used to separate liquids with high boiling poi...

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Q8. What factors will you take in consideration to check evaporator efficiency?

Ans.

Factors to consider for checking evaporator efficiency

Temperature difference between inlet and outlet air
Airflow rate
Refrigerant flow rate
Frost buildup on evaporator coils
Cleanliness of evaporator coils
Type of refrigerant used

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Q9. Tell us about yourself

Ans.

I am a highly motivated individual with a passion for learning and a strong work ethic.

I have a Bachelor's degree in Computer Science
I have completed several internships in software development
I am proficient in multiple programming languages including Java and Python
I enjoy working in a team environment and collaborating on projects
I am always looking for new challenges and opportunities to grow

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Q10. 2. Why would I like to move to Gujarat?

Ans.

Gujarat offers a rich cultural heritage, diverse cuisine, and a thriving business environment.

Gujarat is home to several UNESCO World Heritage Sites such as the Rani ki Vav stepwell and the Champaner-Pavagadh Archaeological Park.
The state is known for its delicious cuisine, including dishes like dhokla, thepla, and fafda.
Gujarat has a strong economy, with a focus on industries such as textiles, chemicals, and pharmaceu...

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Q11. 3. Do you think you can inspire?

Ans.

Yes, I believe I can inspire others through my actions and words.

I have a positive attitude and outlook on life
I am passionate about my work and hobbies
I enjoy helping others and sharing my knowledge and experiences
I have received positive feedback and recognition for my leadership and motivational skills

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Q12. 4. Convince me under 3 minutes why we should take you.

Ans.

I have the skills, experience, and passion to excel in this role.

I have a proven track record of success in similar roles.
I am highly motivated and dedicated to achieving results.
I have excellent communication and interpersonal skills.
I am a quick learner and adaptable to new situations.
I am passionate about this industry and eager to contribute my expertise.
I am confident that I can make a valuable contribution to you

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Interview Preparation Tips

Round: Test
Experience: Aptitude:
Time was short. 3O Qs in 30 minutes was a time-crunch. As my aptitude is weak, I had put in prior efforts to put up a decent performance. I could solve around 14-15 Qs in that time.

Technical:
50 Qs in 30 minutes. The Qs were fairly on easier side. Just that, Qs spanned all across chemical engineering, with almost equal weightage on all topics. Most Qs were from past years' GATE papers. I attempted around 40 Qs.
Tips: 1. For aptitude, prepare well in advance if you are weak.
2. Strengthen technical by solving MCQs from Indiabix.com
3. Since there are no negatives, go for most Qs.
Duration: 60 minutes
Total Questions: 80

Round: Technical Interview
Experience: I had a good technical interview. Most of the Qs were logical. The interviewer made sure I was comfortable through out the interview, each Qs was followed by a light Q.
Tips: 1. Be cool as a cucumber. 2. Be thorough with all subjects.3. If you think you don't know answer, think logically.4. Try to deviate the Qs to your strengths.

Round: HR Interview
Experience: It was the most relieving interview ever! It was very jovial and open-hearted interview.
Tips: 1. Again, be cool
2. Work on your speaking skills.
3. Know yourself well.

General Tips: Prepare for each, well in advance.
Skills: Technical skills., Speaking skills
College Name: NIT DURGAPUR
Motivation: It was one of the finest to be recruiting from Chemical.
Funny Moments: The HR interviewer asked me why does each member of my family have a different surname.
And he got very emotional when I told him I am from Odisha, because that reminded him of how his old Odia friend used to feed him Odia dishes.

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Reliance Industries

Aayush Agarwal

posted on 3 Apr 2015

Interview Questionnaire

6 Questions

Q1. Tell me about yourself?

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Q2. Why do u want to join RIL?

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Q3. Why the gibbs free energy is called free energy?

Ans.

Gibbs free energy is called free energy because it is the energy available to do work at constant temperature and pressure.

Gibbs free energy is the maximum amount of work that can be obtained from a system at constant temperature and pressure.
It takes into account both the enthalpy and entropy of a system.
If the Gibbs free energy is negative, the reaction is spontaneous and can do work.
Examples include the combustion o...

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Q4. What are the maxwell's equations?

Ans.

Maxwell's equations describe the behavior of electromagnetic fields.

There are four equations: Gauss's law, Gauss's law for magnetism, Faraday's law, and Ampere's law with Maxwell's addition.
Together, these equations explain how electric and magnetic fields interact and propagate through space.
Maxwell's equations are fundamental to the study of electromagnetism and have many practical applications, such as in the design...

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Q5. Some questions from conduction

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Q6. Designing of Distillation Column?

Ans.

Designing of Distillation Column

Determine the desired separation
Select the appropriate column type
Calculate the number of theoretical plates
Determine the feed location and reflux ratio
Design the reboiler and condenser
Select appropriate materials of construction
Consider safety and environmental factors

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Interview Preparation Tips

Round: Test
Experience: Overall it is a balanced paperIn aptitude, No of questions is 30 in 30 min. most of the question were easy and mostly they are from topics like work, speed, time, distance, series. Some questions are from English like word meaning, antonym, synonym etc.In technical, no. of questions is 50 in 30 min. The questions were from whole of the chemical engg like from thermo, mass, heat, cre but not from process control or instrumentation or from chemical technology. Most of the questions were conceptual and are just theoretical.
Tips: For apti, try to solve questions from www.indiabix.comFor technical, brush up ur conceptual knowledge and try to learn more and more of mass, heat, themo and cre.
Duration: 60 minutes
Total Questions: 80

Round: Technical Interview
Experience: Overall my interview experience is good. I gave around 70 percent of the answers. My interview is purely technical but it was not so with my friend. His interview is 90% HR.So u never know what type of interview u r going to face when u walk in there.In my interview the questions were mostly asked from thermodynamics and its applications.
Tips: Be calm and confident.Try not to get nervous.Never try to attempt the questions of which u don't know the answers. Attempting those questions and thereafter not giving answers properly gives a bad impression.

General Tips: As I previously told try to remain calm and not get nervous.If u do so no one can take that job from u.And by chance u don't get selected, then do not get disheartened and just think about ur mistakes and try to improve them as U are the best judge of yourself.
Skill Tips: Do not get nervous in the interview.Do not try to solve the whole technical paper rather go through it and attempt the questions u think u can do.For improving communication skill, try to communicate with ur friends in English. Read newspaper and communicate with urself in mirror ( this method will particularly help u a lot in improving ur communication skills and will also free u from any kind of presentation fears).
Skills: Confidence, Time Management, Communication
College Name: MNIT
Motivation: yeah RIL is a very good company, very large and with a lot of scope.So just go for it as if u want to build ur repo then it is one of the best platform to do so.
Funny Moments: one of my friend got injured before the interview. So when he entered for the interview,HR saw his hand and asked what happened. So he hold HR that he got slipped on stairs. After that HR said to him "khudko ko sambhal nhi pa rhe company ko kya sambhaloge".. So try not to lose ur senses if u face such kind of things .They just purposely do that to check how u can perform under pressure.And that friend of mine was also selected for the job.

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Reliance Industries

Anonymous

posted on 6 Dec 2016

I applied via Campus Placement and was interviewed in Dec 2016. There were 4 interview rounds.

Interview Preparation Tips

Round: Test
Experience: The test consists of two sections. First section is Aptitude and it has 30 questions (30 minutes). This section has questions on numerical ability, logical reasoning and verbal ability. Each question carries 2 marks and no negative marks. Second section is technical section and this section has 50 questions and each one carries 1 mark (30 minutes). For mechanical engineering stream, the questions were asked mainly from materials science, strength of materials. Remaining questions were asked from other core subjects. All the technical questions were theoretical questions and no problem solving.
Tips: Briefly touch up all the core mechanical subjects and you will be through the test.
Duration: 1 hour

Round: Technical + HR Interview
Experience: Firstly, a form was given before the interview. In the form, they asked us to fill all our bio data, projects we have done and some basic HR questions. There's only one interviewer. The first question was "Tell me about yourself". He asked based on what we have written in the form. He asked about my goals, role model and also about the company. He mostly checked whether I am interested in the company or not.
Feedback from others - Projects, Interns and technical questions on material science.

Skills: Managerial, Communication
College Name: IIT Madras

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Reliance Industries

Anonymous

posted on 6 Dec 2016

I applied via Campus Placement and was interviewed in Dec 2016. There were 3 interview rounds.

Interview Preparation Tips

Round: Test
Experience: The test was for 1 hour . It consisted of aptitude and technical sections each for 30 mins. Technical was of gate level questions and aptitude was a basic math test with some verbal ability questions.
Duration: 1 hour

Round: HR Interview
Experience: It was a basic HR interview for about 30 minutes. And mostly the selection was based on the test scores so if you have done well in the test you are almost selected for the job

College Name: IIT Madras

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Petrofac Commissioning Field Operator Interview Questions, Process, and Tips

Petrofac Commissioning Field Operator Interview Experiences

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