Tamilnadu Petroproducts Senior Instrument Engineer Interview Questions and Answers

Q1. How will you identify if a pump is cavitating while working on a DCS panel?
Ans. 
To identify if a pump is cavitating while working on a DCS panel, you can look for certain indicators.
• Monitor the pump's suction pressure. If it is fluctuating or dropping below the specified range, it may indicate cavitation.

• Check the pump's discharge pressure. If it is higher than normal, it could be a sign of cavitation.

• Listen for unusual noises such as a rattling or grinding sound coming from the pump.

• Inspect the p...read more
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Q2. How would you prepare a hydrocarbon vessel for vessel entry?
Ans. 
To prepare a hydrocarbon vessel for vessel entry, follow these steps:
• Ensure the vessel is properly isolated from the process and all sources of energy

• Ventilate the vessel to remove any flammable or toxic gases

• Perform a thorough inspection of the vessel for any signs of leaks or damage

• Implement proper lockout/tagout procedures to prevent accidental activation of equipment

• Provide appropriate personal protective equipment...read more
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My GD topic was renewable energy.

Q1. Tell me about yourself
Ans. 
I am a Senior Engineer with 10+ years of experience in designing and implementing complex systems.
• 10+ years of experience in engineering

• Specialize in designing and implementing complex systems

• Strong problem-solving skills

• Experience with various programming languages such as Java, Python, and C++
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Q2. Why do you want to leave your previous company and join GAIL
Ans. 
Seeking new challenges and growth opportunities at GAIL.
• Desire for new challenges and opportunities for growth

• Interested in working in a different industry or with different technologies

• Attracted to GAIL's reputation and projects

• Seeking a more collaborative and innovative work environment
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Q3. What do your parents do
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My parents are both retired now, but my father used to work as a civil engineer and my mother was a teacher.
• Father worked as a civil engineer

• Mother was a teacher

• Both are retired now
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Q4. Have you ever visited Delhi earlier
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Yes, I have visited Delhi earlier for a business trip.
• Visited Delhi for a business trip

• Explored historical sites like Red Fort and Qutub Minar

• Enjoyed local cuisine like butter chicken and chaat
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Q5. How did you reach Noida for interview
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Q6. Where are you staying in Noida for interview process
Ans. 
I am staying at a hotel in Sector 18, Noida for the interview process.
• Staying at a hotel in Sector 18, Noida

• Close to the interview location

• Comfortable accommodation for the duration of the process
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Q7. Related family background
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Q1. Detailed technical questions about bearing, pump, furnace tubes (1st and 2nd pass)MOC, TLE MOC, heat exchanger tube MOC, TEMA codes and classification etc.
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Q2. Decoking process of cracking furnace, Naphtha circuit of furnace with sketches,
Ans. 
Decoking process involves removing coke deposits from cracking furnace and naphtha circuit to maintain efficiency.
• Decoking process involves burning off coke deposits using controlled combustion.

• Mechanical decoking involves using high-pressure water jets to remove coke deposits.

• Chemical decoking involves using solvents or acids to dissolve coke deposits.

• Regular decoking is essential to prevent blockages and maintain fur
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Q3. Detailed refrigeration cycles
Ans. 
Refrigeration cycles are thermodynamic processes used in refrigerators and air conditioners to transfer heat from a low temperature reservoir to a high temperature reservoir.
• Refrigeration cycles typically involve four main components: compressor, condenser, expansion valve, and evaporator.

• The refrigerant undergoes a cycle of compression, condensation, expansion, and evaporation to absorb heat from the space being coole...read more
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Q4. Safety related questions which I couldn't answer well
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Q5. Safety procedures before starting of hot job
Ans. 
Safety procedures before starting a hot job include obtaining a hot work permit, conducting a hazard assessment, ensuring proper ventilation, and having fire extinguishing equipment nearby.
• Obtain a hot work permit before starting any hot job

• Conduct a hazard assessment to identify potential risks

• Ensure proper ventilation in the work area to prevent buildup of flammable gases

• Have fire extinguishing equipment nearby and r
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Q6. Furnace tubes Welding related questions
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Q7. Scaffolding and insulation related general questions (easy)
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Q1. I was asked to make a presentation on laser technology.
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Knowledge of the English language, its vocabulary and comprehension. Ability to solve basic mathematical problem, which shows the capacity to use an analytical approach to everyday puzzles.

Q1. Tell me about your self
Ans. 
I am an experienced Instrument Engineer with a passion for problem-solving and a track record of successful project delivery.
• I have over 10 years of experience in the field of instrumentation, working on projects ranging from small-scale upgrades to large-scale installations.

• I am skilled in the use of a variety of instrumentation software and hardware, including PLCs, DCSs, and SCADA systems.

• I have a strong understandi...read more
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Q2. What type of instruments do you have in plant?
Ans. 
In our plant, we have a wide range of instruments including pressure transmitters, temperature sensors, flow meters, level indicators, control valves, and analyzers.
• Pressure transmitters

• Temperature sensors

• Flow meters

• Level indicators

• Control valves

• Analyzers
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Q3. Working principle of mass flow meter.
Ans. 
Mass flow meter measures the mass flow rate of a fluid in a pipeline.
• Mass flow meter works on the principle of Coriolis effect or thermal dispersion.

• It measures the mass flow rate of a fluid in a pipeline.

• The fluid flows through a vibrating tube and the frequency of vibration is proportional to the mass flow rate.

• It is commonly used in industries such as oil and gas, chemical, and food processing.

• It provides accurate a
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Q4. Last issue faced in any instrument and solutions.
Ans. 
Last issue faced was with a pressure transmitter.
• The pressure transmitter was giving erratic readings.

• Checked the wiring and found a loose connection.

• Tightened the connection and calibrated the transmitter.

• Verified the readings and ensured proper functioning of the instrument.
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Q5. Working principle of Radar level gauge.
Ans. 
Radar level gauge uses electromagnetic waves to measure the level of liquid or solid in a tank or vessel.
• Radar level gauge emits high-frequency electromagnetic waves towards the surface of the liquid or solid in the tank.

• The waves are reflected back to the gauge by the surface of the liquid or solid.

• The time taken for the waves to travel to the surface and back is measured and used to calculate the level of the liquid ...read more
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Q6. What is the name of device which generates microwave in radar
Ans. 
The device which generates microwave in radar is called a magnetron.
• Magnetron is a type of vacuum tube that generates microwaves using the interaction of a stream of electrons with a magnetic field.

• It is commonly used in radar systems, microwave ovens, and other electronic devices that require high-frequency electromagnetic waves.

• Examples of radar systems that use magnetrons include weather radar, air traffic control r
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Q7. Control valve components and it's characteristic and it's use as per its characteristic in various applications
Ans. 
Control valve components, characteristics, and applications
• Control valve components include actuator, positioner, and valve body

• Characteristics include linear, equal percentage, and quick opening

• Linear valves are used for on/off applications, equal percentage for modulating flow, and quick opening for emergency shutdown

• Applications include oil and gas, chemical, and power generation industries
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Q8. Why so many holes metal pipe which is inside the tank for radar gauge.
Ans. 
The holes in the metal pipe inside the tank for radar gauge are for pressure equalization.
• The holes allow the pressure inside the pipe to equalize with the pressure inside the tank.

• This prevents any false readings due to pressure differences.

• The number and size of the holes are designed based on the tank size and fluid properties.

• The holes also prevent any vacuum formation inside the tank during fluid withdrawal.

• Exampl...read more
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Q9. Various instruments and it's make
Ans. 
Various instruments and their makes
• Pressure Transmitter - Rosemount, Yokogawa, Honeywell

• Flow Meter - Endress+Hauser, Siemens, Emerson

• Temperature Transmitter - ABB, Siemens, Yokogawa

• Level Transmitter - Vega, Magnetrol, Krohne
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Q1. Tell me about your self.
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Q2. Notice period discussion
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Q3. CTC discussion and accomodation
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Q1. Mark VIe related questions were asked
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Q2. What specific is related to the terminal board
Ans. 
Terminal board is a device used to connect multiple wires or cables in an organized manner.
• Used for connecting multiple wires or cables

• Helps in organizing the connections

• Commonly used in electrical and electronic systems
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Q3. Barcode are specific to each terminal boards
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Q1. About project in depth
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Q2. What are some technical questions related to your job description?
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