Mahanagar Gas Service Engineer Interview Questions and Answers

Q1. What is upper yield and lower yield in stress strain diagram
Ans. 
Upper and lower yield refer to the stress values at which a material begins to deform plastically.
• Upper yield is the stress value at which a material begins to deform plastically under increasing stress.

• Lower yield is the stress value at which a material begins to deform plastically under decreasing stress.

• These values are important in determining the strength and ductility of a material.

• For example, if a material has ...read more
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Q2. What is difference between toughness and hardness
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Toughness is the ability to withstand stress without breaking, while hardness is the ability to resist indentation or scratching.
• Toughness is a measure of a material's ability to absorb energy before breaking or fracturing.

• Hardness is a measure of a material's resistance to indentation or scratching.

• Toughness is important in materials that are subjected to impact or shock loading, while hardness is important in materia...read more
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Q1. Explain All the laws of Thermodynamics
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The laws of thermodynamics are fundamental principles governing energy and heat transfer in physical systems.
• First Law: Energy cannot be created or destroyed, only transferred or converted.

• Second Law: Heat naturally flows from hot to cold objects, and entropy tends to increase over time.

• Third Law: As temperature approaches absolute zero, entropy approaches a minimum value.

• Examples: A car engine converting fuel into mot...read more
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Q2. One should have good Engineeringskills
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Q1. Salary Expectation
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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
Ans. 
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
Ans. 
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. Simple pump related questions
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