Renault Nissan Technology & Business Centre India Automobile Engineer Interview Questions and Answers

Q1. What is 2 stroke and 4 stroke engine?
Ans. 
A 2-stroke engine completes a power cycle in two strokes of the piston, while a 4-stroke engine completes it in four strokes.
• 2-stroke engine: Combustion occurs every revolution of the crankshaft.

• 4-stroke engine: Combustion occurs every two revolutions of the crankshaft.

• 2-stroke engines are simpler, lighter, and have higher power-to-weight ratio.

• 4-stroke engines are more fuel-efficient and have better emissions control.

• ...read more
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Q2. What is automobile engine? Brief description.
Ans. 
An automobile engine is a device that converts fuel into mechanical energy to power the vehicle.
• An automobile engine is the heart of a vehicle, responsible for generating power to propel the vehicle forward.

• It works on the principle of internal combustion, where fuel is burned inside the engine to produce energy.

• There are different types of automobile engines, such as gasoline engines, diesel engines, and electric moto...read more
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Q3. Why we use 4 stroke engine?
Ans. 
4 stroke engines are used in automobiles for their efficiency, power output, and reduced emissions.
• 4 stroke engines provide better fuel efficiency compared to 2 stroke engines.

• They have a higher power output due to separate intake, compression, power, and exhaust strokes.

• 4 stroke engines produce fewer emissions as they have a dedicated exhaust stroke.

• Examples of automobiles using 4 stroke engines include cars, trucks,
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Q4. Why we not use 2 stroke engine?
Ans. 
2 stroke engines are not commonly used due to their higher emissions, lower fuel efficiency, and shorter lifespan.
• 2 stroke engines produce more emissions compared to 4 stroke engines.

• They have lower fuel efficiency as they consume more fuel per power stroke.

• The lubrication system in 2 stroke engines is less effective, leading to shorter engine lifespan.

• Examples of vehicles that still use 2 stroke engines include some m
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Q5. What is Hybrid engine vehicle?
Ans. 
A hybrid engine vehicle is a vehicle that combines two or more power sources, typically an internal combustion engine and an electric motor.
• Hybrid vehicles use regenerative braking to recharge their batteries.

• They can operate on either the internal combustion engine, the electric motor, or both.

• Hybrid engines improve fuel efficiency and reduce emissions.

• Examples of hybrid vehicles include the Toyota Prius, Honda Insigh
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Q6. What is BS standard in India?
Ans. 
BS stands for Bharat Stage, which is the emission standards set by the Indian government for vehicles.
• BS standards are used to regulate the emission of pollutants from vehicles in India.

• These standards are based on European emission standards and are implemented in a phased manner.

• Each stage of BS standards sets stricter limits on the emission of pollutants such as carbon monoxide, nitrogen oxides, and particulate matt...read more
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Q1. Hello sir I'm saravanakumar I have three years experience in hyundai motors india and now working in bmw.
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Safety and quality, Team work & collaboration,Time management, manpower handling, quick learner.

Q1. How many types of manifold?
Ans. 
There are two types of manifolds: intake manifold and exhaust manifold.
• Intake manifold: It supplies the air-fuel mixture to the cylinders.

• Exhaust manifold: It collects and expels the exhaust gases from the cylinders.

• Examples: Cast iron and stainless steel manifolds.
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Q2. How many types of gasket are used in automobile?
Ans. 
There are several types of gaskets used in automobiles for various purposes.
• Cylinder head gasket

• Exhaust manifold gasket

• Intake manifold gasket

• Valve cover gasket

• Oil pan gasket

• Water pump gasket

• Transmission gasket

• Differential gasket

• Timing cover gasket

• Turbocharger gasket
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Q3. What kind of material is used in making cylinder gasket heads ?
Ans. 
Cylinder gasket heads are typically made of materials like graphite, asbestos, or metal.
• Graphite is a common material used in cylinder gasket heads due to its excellent sealing properties.

• Asbestos was previously used in gaskets but has been phased out due to health concerns.

• Metal gaskets, such as those made of steel or aluminum, are also used in certain applications.

• Other materials like rubber or composite materials ma...read more
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Q4. How many kind of material is used in making oil pan gaskets?
Ans. 
Oil pan gaskets are typically made from materials such as rubber, cork, silicone, or a combination of these.
• Rubber is a common material used in oil pan gaskets due to its flexibility and resistance to oil and heat.

• Cork is another material used in gaskets as it provides a good seal and is resistant to oil and chemicals.

• Silicone gaskets are known for their durability and ability to withstand high temperatures.

• Some gasket...read more
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Q5. How many types of manifold gaskets ?
Ans. 
There are several types of manifold gaskets used in automobile engines.
• Exhaust manifold gaskets

• Intake manifold gaskets

• Throttle body gaskets

• EGR (Exhaust Gas Recirculation) gaskets

• Turbocharger gaskets

• Supercharger gaskets
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Q6. The fly wheel is used as a part of mechanism?
Ans. 
Yes, the flywheel is used as a part of a mechanism.
• The flywheel is a mechanical device used to store rotational energy.

• It is typically used in engines to maintain a steady rotational speed and provide smooth power delivery.

• In automobiles, the flywheel is connected to the crankshaft and helps in starting the engine, storing energy during deceleration, and providing rotational inertia.

• It also helps in reducing engine vib...read more
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Q7. How many types of air cleaner
Ans. 
There are two types of air cleaners: mechanical air cleaners and electronic air cleaners.
• Mechanical air cleaners use filters to trap dust and other particles from the air.

• Electronic air cleaners use an electric charge to attract and trap particles.

• Examples of mechanical air cleaners include panel filters, pleated filters, and HEPA filters.

• Examples of electronic air cleaners include electrostatic precipitators and ioniz
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Q8. Pump gaskets are made of kinds of material?
Ans. 
Pump gaskets are made of various materials.
• Pump gaskets can be made of rubber, cork, paper, or metal.

• Rubber gaskets are commonly used due to their flexibility and resistance to fluids.

• Cork gaskets are known for their compressibility and ability to seal irregular surfaces.

• Paper gaskets are used in low-pressure applications.

• Metal gaskets, such as those made of steel or copper, are used in high-temperature and high-pressu
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Q9. One some each manifold is connected to a separate exhaust pipe,muffler and tail pipe ?
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Q10. Wankel engine originated by a engineer?
Ans. 
Felix Wankel, a German engineer, originated the Wankel engine.
• The Wankel engine was invented by Felix Wankel in the 1950s.

• Felix Wankel was a German mechanical engineer.

• The Wankel engine is a type of internal combustion engine that uses a rotary design.

• It is known for its compact size, high power-to-weight ratio, and smooth operation.

• Mazda is one of the most well-known manufacturers to have used the Wankel engine in the
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Q11. Wankel engine is originated in ?
Ans. 
The Wankel engine was originated in Germany.
• The Wankel engine was invented by Felix Wankel in the 1950s.

• It was first developed and produced by the German company NSU Motorenwerke AG.

• The engine design features a rotary combustion chamber instead of the traditional reciprocating pistons.

• It offers advantages such as compact size, high power-to-weight ratio, and smooth operation.

• Mazda is one of the most well-known manufact...read more
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Q12. How many types of engine with respect to the number of cylinder ?
Ans. 
There are various types of engines based on the number of cylinders.
• Engines can have 1, 2, 3, 4, 5, 6, 8, 10, 12, or even more cylinders.

• The number of cylinders affects the engine's performance, power, and fuel efficiency.

• Examples include inline engines (4-cylinder), V engines (6-cylinder), and W engines (12-cylinder).
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Q13. How many kinds of two stroke engine
Ans. 
There are two kinds of two-stroke engines: spark ignition and compression ignition.
• Spark ignition two-stroke engines: These engines use a spark plug to ignite the fuel-air mixture, commonly found in motorcycles, chainsaws, and outboard motors.

• Compression ignition two-stroke engines: These engines rely on the heat generated by compression to ignite the fuel-air mixture, commonly found in large marine engines and some in
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Q14. 4 stoke engine is classi
Ans. 
4 stroke engine is classified as an internal combustion engine.
• It has four strokes: intake, compression, combustion, and exhaust.

• It is commonly used in automobiles, motorcycles, and small aircraft.

• It is more fuel-efficient and produces less pollution than a 2-stroke engine.
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Q1. Experience related questions
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Q2. Theory related questions
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Q3. Family background
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Q4. Character and hobbies
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Q1. What is automobile
Ans. 
An automobile is a vehicle designed for transportation that is powered by an engine, typically with four wheels and seating for passengers.
• Automobiles come in various types such as cars, trucks, vans, and SUVs.

• They are used for personal transportation, commercial purposes, and emergency services.

• Automobiles require regular maintenance and servicing to ensure optimal performance and safety.
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Q1. Explain the significance of governor in automobiles?
Ans. 
Governor regulates the speed of the engine and prevents it from exceeding the maximum limit.
• Governor is a device that controls the fuel supply to the engine.

• It maintains a constant speed of the engine by adjusting the fuel supply.

• It prevents the engine from exceeding the maximum limit of speed.

• Governor is used in automobiles, generators, and other machines that require a constant speed.

• Types of governors include centri
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Q2. What is the use of Natural gas in automobiles
Ans. 
Natural gas is used as an alternative fuel in automobiles to reduce emissions and increase fuel efficiency.
• Natural gas is a cleaner burning fuel compared to gasoline or diesel

• It produces lower emissions of harmful pollutants such as carbon monoxide, nitrogen oxides, and particulate matter

• It is cheaper than gasoline or diesel in many countries

• It can be used in both compressed natural gas (CNG) and liquefied natural gas ...read more
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Q3. What is an automotive differential and how does it work?
Ans. 
Automotive differential is a device that allows wheels to rotate at different speeds while maintaining power to both wheels.
• It is located between the drive wheels of a vehicle.

• It consists of a set of gears that allows the wheels to rotate at different speeds.

• It works by taking power from the engine and splitting it between the two wheels.

• It allows the outer wheel to rotate faster than the inner wheel during a turn.

• It i...read more
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Q4. What is oil grade SAE stands for?
Ans. 
SAE stands for Society of Automotive Engineers.
• SAE is a professional organization for engineers in the automotive industry.

• SAE sets standards for various aspects of automotive engineering, including oil grades.

• Oil grade SAE refers to the viscosity of the oil, which is a measure of its resistance to flow.

• Common oil grades include SAE 5W-30, SAE 10W-40, and SAE 15W-50.

• The first number in the oil grade refers to its visco...read more
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Q5. What is the use of Natural gas in automobiles?
Ans. 
Natural gas is used as an alternative fuel in automobiles to reduce emissions and save costs.
• Natural gas is a cleaner burning fuel compared to gasoline or diesel.

• It produces fewer emissions of harmful pollutants like carbon monoxide, nitrogen oxides, and particulate matter.

• It is cheaper than gasoline or diesel, making it a cost-effective alternative fuel.

• Natural gas can be used in compressed natural gas (CNG) vehicles ...read more
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