Chennai Petroleum Corporation Draughtsman Mechanical Interview Questions and Answers

Mineral oil is a clear, colorless, odorless, and tasteless oil derived from petroleum.

• Mineral oil is commonly used in cosmetics, pharmaceuticals, and as a lubricant.

• It is often used as a laxative to relieve constipation.

• Mineral oil can also be found in baby oil and various skincare products.

• It is important to note that mineral oil should not be ingested in large quantities as it can cause health issues.

I have 5 years of experience in selling lubricants to industrial clients, achieving 20% growth in sales each year.

• Developed strong relationships with key clients in the industrial sector

• Identified and pursued new business opportunities in the lubricants market

• Provided technical expertise and support to clients in selecting the right lubricants for their needs

• Consistently met or exceeded sales targets through effective

Lubricants are substances used to reduce friction between surfaces in mutual contact, which ultimately reduces the heat generated when the surfaces move.

• Lubricants can be in the form of oils, greases, or solid lubricants.

• They are used in various industries such as automotive, manufacturing, and aerospace.

• Lubricants help to extend the lifespan of machinery by reducing wear and tear on moving parts.

• They also help to impr...read more

MCO, PCMO, and CVO lubricants are different types of lubricants used in various industries for different purposes.

• MCO stands for Marine Cylinder Oil, used in marine engines to reduce friction and wear.

• PCMO stands for Passenger Car Motor Oil, used in automotive engines to lubricate moving parts and reduce heat.

• CVO stands for Commercial Vehicle Oil, used in heavy-duty vehicles like trucks and buses to provide lubrication

Lubricants 20w40 and 10w30 differ in their viscosity grades, with 20w40 being thicker and better suited for high temperatures.

• 20w40 has a higher viscosity grade compared to 10w30

• 10w30 is thinner and flows more easily in cold temperatures

• 20w40 is better suited for high temperature environments

• 10w30 may provide better fuel economy due to lower viscosity

15w40 and 5w30 are different types of lubricants used in vehicles, with varying viscosity and temperature ranges.

• 15w40 has a higher viscosity compared to 5w30

• 5w30 is better suited for colder temperatures due to its lower viscosity

• 15w40 is commonly used in diesel engines while 5w30 is used in gasoline engines

The business model for the coming day energy solution should focus on utilizing renewable resources in the most cost-effective way.

• Identify the most viable renewable resources available in the region

• Analyze the cost of implementing and maintaining the infrastructure for utilizing these resources

• Develop a pricing strategy that is competitive with traditional energy sources

• Consider government incentives and regulations t...read more

Safety refers to the condition of being protected from harm, danger, or injury.

• Safety involves taking measures to prevent accidents and injuries

• It includes following rules and regulations to ensure a safe environment

• Safety can be achieved through proper training and education

• Examples of safety measures include wearing protective gear, using safety equipment, and practicing safe behaviors

• Safety is important in all indus...read more

LEL stands for Lower Explosive Limit and is the minimum concentration of a gas or vapor in air that can ignite.

• LEL is a safety term used in industries dealing with flammable gases and liquids.

• It is expressed as a percentage of the gas or vapor in air.

• If the concentration of the gas or vapor is below the LEL, it is too lean to ignite.

• If the concentration is above the LEL, it is too rich and can ignite.

• For example, the L...read more

JSA/JHA stands for Job Safety Analysis/Job Hazard Analysis. It is a process of identifying potential hazards and risks in a job or task.

• JSA/JHA is a systematic approach to identify and mitigate potential hazards in a job or task

• It involves breaking down a job or task into steps and analyzing each step for potential hazards

• The analysis includes identifying the hazards, assessing the risks, and implementing controls to m...read more

HSE plays a crucial role in ensuring the safety and well-being of employees and the environment.

• HSE stands for Health, Safety, and Environment.

• It involves identifying and assessing potential hazards and implementing measures to control or eliminate them.

• HSE also includes training employees on safety procedures and emergency response plans.

• Examples of HSE measures include wearing personal protective equipment, conductin...read more

Hchem is not a known term or acronym in the engineering field.

• Hchem is not a commonly used term in engineering

• It is possible that the interviewer misspoke or meant to ask a different question

• Without more context, it is difficult to provide a more specific answer

Hazop is a structured and systematic technique used to identify potential hazards and operability problems in industrial processes.

• Hazop stands for Hazard and Operability Study

• It involves a team of experts analyzing a process to identify potential hazards and operability issues

• Hazop is commonly used in the chemical, oil and gas, and pharmaceutical industries

• The process involves breaking down the process into smaller pa...read more

Confined space refers to an area that is enclosed and has limited access and ventilation.

• Examples include tanks, silos, sewers, and tunnels.

• Workers entering confined spaces must follow safety protocols and use specialized equipment.

• Hazards in confined spaces include lack of oxygen, toxic gases, and physical obstructions.

• Proper training and communication are crucial for working in confined spaces.

Work at height refers to any task performed at a height where a person could fall and injure themselves.

• Work at height involves working on ladders, scaffolding, roofs, or any other elevated surface

• It is important to use appropriate safety equipment such as harnesses, guardrails, and safety nets

• Workers should be trained on how to safely work at height and how to properly use safety equipment

• Examples of work at height in...read more

Confined spaces pose a significant hazard due to limited entry and exit points, poor ventilation, and potential for hazardous substances.

• Limited entry and exit points can make it difficult to escape in case of an emergency

• Poor ventilation can lead to a buildup of toxic gases or lack of oxygen

• Potential for hazardous substances such as chemicals, fumes, or dust

• Examples include tanks, silos, sewers, and tunnels

• Proper trai...read more

Precautions to be taken while working in confined spaces

• Proper ventilation and air quality testing

• Use of personal protective equipment

• Proper lighting and communication equipment

• Training and certification for workers

• Emergency rescue plan in place

LEL&UEL stands for Lower Explosive Limit and Upper Explosive Limit respectively. They are the minimum and maximum concentrations of a flammable gas or vapor in air that can ignite.

• LEL is the lowest concentration of a gas or vapor that can ignite

• UEL is the highest concentration of a gas or vapor that can ignite

• Concentrations between LEL and UEL are considered flammable

• LEL and UEL vary depending on the gas or vapor

• LEL an...read more

Fire is a chemical reaction that releases heat, light, and various gases.

• Fire is a rapid oxidation process that occurs when fuel (such as wood, paper, or gasoline) combines with oxygen in the presence of heat or a spark.

• It releases heat, light, and various gases such as carbon dioxide, water vapor, and nitrogen oxides.

• Fire can be beneficial (such as for cooking or heating) or destructive (such as in wildfires or house ...read more

There are four types of fire: Class A, Class B, Class C, and Class D.

• Class A fires involve ordinary combustibles such as wood, paper, or cloth.

• Class B fires involve flammable liquids or gases such as gasoline, oil, or propane.

• Class C fires involve electrical equipment such as appliances, wiring, or circuit breakers.

• Class D fires involve combustible metals such as magnesium, titanium, or sodium.

There are different types of fire extinguishers for different types of fires.

• Water extinguishers for Class A fires (wood, paper, cloth, etc.)

• CO2 extinguishers for Class B and C fires (flammable liquids and electrical fires)

• Dry chemical extinguishers for Class A, B, and C fires

• Foam extinguishers for Class A and B fires

• Wet chemical extinguishers for Class K fires (cooking oils and fats)

Modes of heat transfer include conduction, convection, and radiation.

• Conduction is the transfer of heat through a material without any movement of the material itself.

• Convection is the transfer of heat through the movement of fluids, such as air or water.

• Radiation is the transfer of heat through electromagnetic waves, such as from the sun or a fire.

Preventing fire requires proper handling of flammable materials and regular maintenance of electrical equipment.

• Store flammable materials in designated areas away from heat sources

• Regularly inspect and maintain electrical equipment

• Install smoke detectors and fire extinguishers in appropriate locations

• Train employees on fire safety procedures and evacuation plans

MSDS stands for Material Safety Data Sheet.

• MSDS provides information about hazardous chemicals and substances.

• It includes information about the physical and chemical properties of the substance, health hazards, precautions for safe handling and use, and emergency procedures.

• MSDS is required by law for all hazardous chemicals and substances used in the workplace.

• It is important to read and understand the MSDS before usi...read more

Firefighting involves identifying and extinguishing fires to prevent damage and loss of life.

• Assess the situation and determine the type and size of fire

• Use appropriate firefighting equipment such as fire extinguishers, hoses, and pumps

• Follow safety protocols and wear protective gear

• Coordinate with other firefighters and emergency responders

• Evacuate people from the affected area

• Monitor the situation and ensure the fire

Prevent accidents by identifying potential hazards and implementing safety measures.

• Conduct regular safety audits and risk assessments

• Provide proper training and education to employees

• Implement safety protocols and procedures

• Use appropriate safety equipment and gear

• Encourage a culture of safety and accountability

• Regularly review and update safety policies and procedures

To investigate an accident, follow a systematic approach involving data collection, analysis, and identification of root causes.

• Gather all available information about the accident, including eyewitness accounts, photographs, and any relevant documents or records.

• Conduct interviews with individuals involved in the accident to gather their perspectives and insights.

• Examine the accident scene for physical evidence, such a...read more

H2S is a colorless, flammable, and toxic gas with a strong odor of rotten eggs.

• H2S is commonly known as hydrogen sulfide.

• It is produced naturally by the breakdown of organic matter and is found in natural gas, crude oil, and volcanic gases.

• It is highly toxic and can cause respiratory failure, loss of consciousness, and even death.

• H2S is used in various industries such as oil and gas, mining, and pulp and paper.

• It is al...read more

H2S is a colorless, flammable, and toxic gas with a strong odor of rotten eggs.

• H2S is highly flammable and can ignite easily

• It is toxic and can cause respiratory failure

• It has a distinctive odor of rotten eggs

• H2S is used in the production of sulfuric acid and in the petroleum industry

Permissible exposure limits (PEL) are the maximum allowable concentrations of hazardous substances in the workplace.

• H2S: PEL is 10 ppm (parts per million) over an 8-hour workday

• CO: PEL is 50 ppm over an 8-hour workday

• CO2: No specific PEL, but recommended exposure limit is 5,000 ppm over an 8-hour workday

• Methane: No specific PEL, but recommended exposure limit is 1,000 ppm over an 8-hour workday

Short term exposure limit (STEL) of H2S is 10 ppm.

• STEL is the maximum concentration of a substance that a worker can be exposed to for a short period of time without suffering from immediate or long-term health effects.

• The STEL for H2S is set at 10 ppm (parts per million) by OSHA (Occupational Safety and Health Administration).

• Exposure to H2S at levels above the STEL can cause symptoms such as eye irritation, headache,...read more

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

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...read more