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Oil And Natural Gas Corporation Refrigeration and Air Conditioning Mechanic Interview Questions and Answers

Updated 14 Feb 2023

Oil And Natural Gas Corporation Refrigeration and Air Conditioning Mechanic Interview Experiences

1 interview found

Interview experience
5
Excellent
Difficulty level
Easy
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Recruitment Consulltant and was interviewed in Jan 2023. There were 2 interview rounds.

Round 1 - Resume Shortlist 
Pro Tip by AmbitionBox:
Keep your resume crisp and to the point. A recruiter looks at your resume for an average of 6 seconds, make sure to leave the best impression.
View all Resume tips
Round 2 - Technical 

(4 Questions)

  • Q1. 1. What is the VAV, HVAC, AHU, full froms 2. What are the refrigeration cycle 3. Types of chillers
  • Ans. 

    This interview question is about VAV, HVAC, AHU, refrigeration cycle, and types of chillers.

    • VAV stands for Variable Air Volume, HVAC stands for Heating, Ventilation, and Air Conditioning, and AHU stands for Air Handling Unit.

    • The refrigeration cycle is a process that removes heat from a low-temperature area and transfers it to a high-temperature area.

    • Types of chillers include air-cooled chillers, water-cooled chillers,

  • Answered by AI
  • Q2. 1. Variable air volume, Heating variable Air conditioning, Air handler unit, 2. Compressor condenser Drive filter expansion evaporator 3. Water cooled chiller & Air cooled chiller
  • Q3. 4. Type of compressors
  • Ans. 

    There are several types of compressors used in refrigeration and air conditioning systems.

    • Reciprocating compressors use pistons to compress refrigerant gas.

    • Rotary compressors use rotating blades or vanes to compress refrigerant gas.

    • Scroll compressors use two spiral-shaped scrolls to compress refrigerant gas.

    • Centrifugal compressors use a high-speed impeller to compress refrigerant gas.

    • Screw compressors use two interlock...

  • Answered by AI
  • Q4. Screw compressor Piston compressor Centrifugal compressor Reciprocating compressor Rotary-screw compressor Scroll compressor

Interview Preparation Tips

Topics to prepare for Oil And Natural Gas Corporation Refrigeration and Air Conditioning Mechanic interview:
  • HVAC System
  • Chiller Plant
Interview preparation tips for other job seekers - Hvac, chillers, package ac, vrf, split ac, window ac,

Interview questions from similar companies

I was interviewed in Apr 2017.

Interview Questionnaire 

3 Questions

  • Q1. Favourite sportsperson
  • Ans. 

    My favourite sportsperson is Serena Williams.

    • Serena Williams is a professional tennis player

    • She has won numerous Grand Slam titles

    • She is known for her powerful serve and aggressive playing style

  • Answered by AI
  • Q2. How is crude oil separated from water?
  • Ans. 

    Crude oil is separated from water through a process called oil-water separation.

    • Oil-water separation is achieved by using various techniques such as gravity separation, centrifugation, and filtration.

    • Gravity separation involves allowing the mixture of crude oil and water to settle, with the oil rising to the top due to its lower density.

    • Centrifugation utilizes the centrifugal force to separate the oil and water by spin...

  • Answered by AI
  • Q3. Questions about memberships in student societies and activities.

Interview Preparation Tips

Round: Resume Shortlist
Experience: On the basis of CGPA

Round: Technical + HR Interview
Experience: I was extremely nervous as this was going to be my first interview as a fresher. Adding to that, their first question was ' who is your favourite basket ball player?' as my CV mentioned that I used to play basketball in school-life. I just didn't know whether I should blabber an arbitrary name or give the honest answer. After giving the latter I was asked how crude oil is seperated from water. I told them that if some time is allowed then crude oil and water will be separated in two layers. Now I dont know why it seemed to me that crude oil having asphalts, coke should have greater specific gravity than water and should appear at bottom. After giving the answer, from their expressions I knew that I had screwed this as well. Now they asked some more teasing questions like why I had joined IIChE, how many meeting I had attended and so on and I don't remember the rest as I was close to tears by then.
Tips: At the end, one of the panelists gently told me 'Please don't be so much nervous from next time'.

College Name: Jadavpur University, Kolkata

I was interviewed in Apr 2017.

Interview Preparation Tips

Round: Technical + HR Interview
Experience: They first asked me to tell me about myself. Then I was asked to briefly explain what I did in my internship at SAIL in summer'16.Then they asked a few technical questions on the project (Modelling of a bio refinery using Indian agrowastes for energy and environmental analysis) that I was doing in that semester under one of my professors. Then they asked me about my favourite subject to which I answered, "Heat Transfer". So they asked me some basic questions on heat exchangers and related graphs.
Then one of the HRs asked me to tell about my career objectives followed by a few other questions like my strength, why CAIRN, what I would have pursued if not engineering,which location would I prefer- Rajasthan(where there is main plant of CAIRN) or Gurgaon(where there is main office of CAIRN but no plant).
Then they asked me if I had any questions to ask to which I asked them a few internship related queries. And this way, the interview ended.

College Name: Jadavpur University, Kolkata

Interview Questionnaire 

3 Questions

  • Q1. How can you handle if there any emergency in production plant
  • Ans. 

    In case of an emergency in production plant, I would follow the emergency protocol and take necessary actions to ensure safety.

    • Immediately alert the emergency response team and follow the established emergency protocol

    • Evacuate the affected area and ensure all employees are accounted for

    • Assess the situation and take necessary actions to contain the emergency

    • Communicate with management and stakeholders to keep them infor...

  • Answered by AI
  • Q2. What are the hazards in your plant and its controle
  • Ans. 

    Hazards in the plant and their control

    • Chemical hazards: Proper storage and handling of hazardous chemicals

    • Electrical hazards: Regular inspection and maintenance of electrical equipment

    • Mechanical hazards: Implementation of safety guards and procedures

    • Fire hazards: Installation of fire detection and suppression systems

    • Ergonomic hazards: Providing ergonomic workstations and equipment

    • Noise hazards: Use of hearing protectio

  • Answered by AI
  • Q3. Type and details of permits
  • Ans. 

    Permits required for production engineering

    • Building permits for construction and modification of production facilities

    • Environmental permits for compliance with regulations on emissions and waste management

    • Operating permits for the operation of specific equipment or processes

    • Safety permits for ensuring workplace safety and adherence to safety standards

    • Export permits for exporting products to other countries

    • Import permit...

  • Answered by AI

Interview Preparation Tips

Round: Resume Shortlist
Experience: Oil and gas specifically from strong back ground like RELIANCE,GSPC

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Approached by Company and was interviewed before Jul 2023. There were 2 interview rounds.

Round 1 - HR 

(2 Questions)

  • Q1. What is your name
  • Q2. Tell me about yourself
Round 2 - One-on-one 

(2 Questions)

  • Q1. Why ongc join u want
  • Q2. Tell us about ongc
  • Ans. 

    ONGC (Oil and Natural Gas Corporation) is a multinational oil and gas company headquartered in India.

    • ONGC is one of the largest oil and gas exploration and production companies in India.

    • It is a public sector undertaking (PSU) under the Ministry of Petroleum and Natural Gas.

    • ONGC has operations both in India and abroad, including countries like Russia, Vietnam, and Brazil.

    • The company is involved in exploration, productio...

  • Answered by AI

I applied via Naukri.com and was interviewed before May 2021. There was 1 interview round.

Round 1 - Technical 

(1 Question)

  • Q1. Which týpes uses valve in chemical industries
  • Ans. 

    Various types of valves are used in chemical industries for different purposes.

    • Gate valves are commonly used in chemical industries for on/off control of flow.

    • Globe valves are used for regulating flow and controlling pressure.

    • Ball valves are suitable for high-pressure applications and provide tight shut-off.

    • Butterfly valves are used for throttling and controlling flow.

    • Diaphragm valves are used for handling corrosive an...

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - I'm very hard working in this Chemical field

Interview Preparation Tips

Round: Test
Experience: aptitude reasoning and base techanical.

Round: Group Discussion
Experience: techanical core branch.

I was interviewed before Jun 2016.

Interview Preparation Tips

Round: Group Discussion
Experience: After topic was announced , we were given one minute time to think about it. We wrote our points on a paper given to us. After some time ,One person started to speak about the topic . Peoples were giving their views one after other. I got chance to speak two times in the time period of 15 minutes. I put my points . Finally it ended well.
Tips: Speak at least for two times , put yr points as early as possible otherwise some other might have same view.if he would speak before u then u have to think something different again.u might not get chance to speak again.
Duration: 15 minutes

Round: Technical + HR Interview
Experience: Selection process was mainly depends on your performance in GATE exam and academic results. 15-20 % weightage was for this round and GD.
They asked few questions (basic ) related to technical and HR.

College Name: NIT Jalandhar

I applied via Recruitment Consultant and was interviewed before Dec 2020. There were 3 interview rounds.

Interview Questionnaire 

4 Questions

  • Q1. Mechanical questions
  • Q2. Mechanical pump
  • Q3. Compressor two staze reciprocating
  • Ans. 

    A compressor with two stages of reciprocating motion.

    • Two-stage reciprocating compressors have two cylinders that compress the air twice.

    • The first stage compresses the air and sends it to the second stage for further compression.

    • This type of compressor is commonly used in industrial applications such as refrigeration and air conditioning.

    • The two-stage design allows for higher efficiency and greater pressure output compa

  • Answered by AI
  • Q4. Tribune questions

Interview Preparation Tips

Interview preparation tips for other job seekers - Mechanical questions and gk current affairs and real life

I applied via Naukri.com and was interviewed in Nov 2019. There were 3 interview rounds.

Interview Questionnaire 

5 Questions

  • Q1. Tell me about your previous job ?
  • Q2. What is deference between RS 485 and RS 232
  • Ans. 

    RS 485 is a multi-point communication standard while RS 232 is a point-to-point communication standard.

    • RS 485 supports up to 32 devices on a single bus while RS 232 only supports two devices.

    • RS 485 uses differential signaling for noise immunity while RS 232 uses single-ended signaling.

    • RS 485 can transmit data over longer distances than RS 232.

    • RS 485 is commonly used in industrial automation and control systems while RS

  • Answered by AI
  • Q3. What is protocol?
  • Ans. 

    Protocol is a set of rules and guidelines that govern the communication between devices or systems.

    • Protocols ensure that devices or systems can communicate with each other effectively and efficiently.

    • They define the format, timing, sequencing, and error checking of messages exchanged between devices or systems.

    • Examples of protocols include TCP/IP, HTTP, FTP, and SMTP.

    • Protocols can be implemented in hardware, software, ...

  • Answered by AI
  • Q4. What is PLC?
  • Ans. 

    PLC stands for Programmable Logic Controller. It is a digital computer used for automation of electromechanical processes.

    • PLC is used in industrial automation to control machinery and processes.

    • It is programmed using ladder logic or other programming languages.

    • PLC can be used in various applications such as manufacturing, transportation, and energy.

    • Examples of PLC brands include Siemens, Allen-Bradley, and Mitsubishi.

    • P...

  • Answered by AI
  • Q5. How many types of PLC?
  • Ans. 

    There are several types of PLCs, including modular, compact, rack-mounted, and software-based PLCs.

    • Modular PLCs are designed to be expandable and customizable.

    • Compact PLCs are smaller and more cost-effective than modular PLCs.

    • Rack-mounted PLCs are designed to be mounted in a standard equipment rack.

    • Software-based PLCs run on a computer and use specialized software to emulate a physical PLC.

    • Other types of PLCs include s...

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - First of all preparation on previous job , what is your role and what to do , how to do ,
* Should be 2 year experience in electronics and automation related., Communication, PLC etc.

Skills evaluated in this interview

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Oil And Natural Gas Corporation Interview FAQs

How many rounds are there in Oil And Natural Gas Corporation Refrigeration and Air Conditioning Mechanic interview?
Oil And Natural Gas Corporation interview process usually has 2 rounds. The most common rounds in the Oil And Natural Gas Corporation interview process are Resume Shortlist and Technical.
What are the top questions asked in Oil And Natural Gas Corporation Refrigeration and Air Conditioning Mechanic interview?

Some of the top questions asked at the Oil And Natural Gas Corporation Refrigeration and Air Conditioning Mechanic interview -

  1. 1. What is the VAV, HVAC, AHU, full froms 2. What are the refrigeration cycle ...read more
  2. 4. Type of compress...read more
  3. Screw compressor Piston compressor Centrifugal compressor Reciprocating compres...read more

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