Indian Oil Corporation Production Graduate Engineer Trainee Interview Questions and Answers

Q1. About yourself and simple mechanical basics
Add your answer

Question are simple and easy to solve

Q1. How the vcr works
Add your answer
Q2. What is navier stokes equation
Add your answer

Q1. What is quenching, normalising and properties of martensite
Ans. 
Quenching, normalising, and properties of martensite are heat treatment processes used to alter the properties of metals.
• Quenching is a rapid cooling process used to harden metals by trapping the atoms in a specific crystalline structure.

• Normalising is a slower cooling process used to refine the grain structure of metals, improving their toughness and ductility.

• Martensite is a hard, brittle phase of steel formed by que...read more
Answered by AI
Add your answer
Q2. What is melting point of plain steel
Ans. 
The melting point of plain steel is approximately 2,500 degrees Fahrenheit.
• Melting point of plain steel can vary depending on the specific composition of the steel.

• Generally, plain carbon steel melts at around 2,500 degrees Fahrenheit.

• Alloy steels may have different melting points due to the addition of other elements.

• Melting point can also be affected by the rate of heating and cooling.
Answered by AI
Add your answer

The aptitude test wasnt easy to crack

Q1. Corrosion reaction
Add your answer
Q2. Questions on thermodynamics
Add your answer

About basic information about subject

Q1. Why do you join RIL
Add your answer

Time distance, time speed

Q1. Explain performance curves of centrifugal pump
Ans. 
Performance curves of centrifugal pump show the relationship between flow rate, head, and efficiency.
• Performance curves show how a pump performs at different flow rates and heads.

• The curve typically includes lines for efficiency, power consumption, and NPSH requirements.

• The shape of the curve can indicate the pump's operating range and efficiency.

• Operating a pump outside of its recommended range can lead to issues like
Answered by AI
Add your answer
Q2. Explain best efficency point of centrifugal pump
Ans. 
The best efficiency point of a centrifugal pump is the operating point where the pump achieves the highest efficiency.
• The best efficiency point is typically located near the pump's BEP (Best Efficiency Point) on the pump curve.

• At the best efficiency point, the pump operates with the least amount of energy consumption and highest output.

• Operating the pump away from the best efficiency point can lead to decreased efficie...read more
Answered by AI
Add your answer
Q3. Explain joule Thomson effect
Ans. 
Joule Thomson effect is the change in temperature of a gas when it is allowed to expand without performing work.
• Occurs when a gas expands through a valve or porous plug

• No external work is done on or by the gas

• Temperature change depends on the gas properties and initial conditions

• Used in natural gas processing to cool the gas for further processing
Answered by AI
Add your answer
Q4. Explain iron carbon phase diagram
Ans. 
Iron carbon phase diagram shows the phases of iron and carbon at different temperatures and compositions.
• Shows the phases of iron and carbon at different temperatures and compositions

• Consists of regions for austenite, ferrite, cementite, and pearlite

• Helps in understanding the microstructure of steel

• Critical points like eutectic point and eutectoid point are important

• Used in heat treatment processes to control the prope
Answered by AI
Add your answer
Q5. Explain series and parallel operation of pumps
Ans. 
Series and parallel operation of pumps involve connecting multiple pumps together to achieve desired flow rates and pressures.
• In series operation, pumps are connected one after the other to increase the total head or pressure that the system can deliver.

• In parallel operation, pumps are connected side by side to increase the total flow rate that the system can deliver.

• Series operation is used when high pressure is requi...read more
Answered by AI
Add your answer