L&T Construction Plant Machinery Engineer Interview Questions and Answers

Engines typically use engine oil as a lubricant, which is circulated through the engine by a pressurized lubrication system.

• Engines typically use engine oil as a lubricant to reduce friction between moving parts

• The lubrication system in engines includes components such as oil pumps, oil filters, and oil passages

• There are different types of lubrication systems such as splash lubrication, pressure lubrication, and dry su...read more

Pumps are mechanical devices used to move fluids by applying pressure. Pressure is the force applied over a specific area.

• Pumps are used to increase the pressure of a fluid to move it from one place to another.

• Pressure is the force applied perpendicular to the surface of an object per unit area.

• Different types of pumps include centrifugal pumps, positive displacement pumps, and diaphragm pumps.

• Pressure can be measured ...read more

Thermal analysis of engines involves studying heat transfer, combustion efficiency, and cooling systems to optimize performance.

• Thermal analysis helps in understanding how heat is generated and transferred within the engine.

• It also involves evaluating combustion efficiency to ensure maximum power output.

• Cooling systems are analyzed to prevent overheating and maintain optimal operating temperatures.

• Examples include usin...read more

Plant & Machinery refers to the equipment and machinery used in industrial settings for production and manufacturing processes.

• Plant refers to the large machinery and equipment used in industrial processes

• Machinery includes tools, devices, and equipment used for specific tasks

• Examples include conveyor belts, forklifts, cranes, and manufacturing equipment

High strength engines and structures require materials with specific properties such as high tensile strength, toughness, and corrosion resistance.

• High tensile strength to withstand high loads and stresses

• Toughness to resist fracture and deformation

• Corrosion resistance to protect against environmental factors

• Lightweight materials to reduce overall weight of the engine or structure

• Heat resistance to withstand high tempe...read more

Turbocharger, intercooler, cooling system, and lubrication system are components used in machinery to enhance performance and efficiency.

• Turbocharger is a device that increases the efficiency and power output of an engine by forcing extra air into the combustion chamber.

• Intercooler is used to cool the compressed air from the turbocharger before it enters the engine, increasing its density and performance.

• Cooling system...read more

RPM stands for Revolutions Per Minute.

• RPM stands for Revolutions Per Minute

• It is a unit of rotational speed

• Commonly used in the context of engines, motors, and other rotating machinery

There are various types of motors including DC motors, AC motors, stepper motors, and servo motors.

• DC motors: used in applications where speed control is important, such as in electric vehicles.

• AC motors: commonly used in household appliances and industrial machinery.

• Stepper motors: used in applications requiring precise position control, like 3D printers.

• Servo motors: used in robotics and automation for accurate contr

Earthing is the process of connecting electrical systems to the ground to prevent electric shock and protect equipment.

• Earthing provides a path for fault currents to flow safely into the ground.

• It helps in stabilizing voltage levels and protecting against lightning strikes.

• Earthing is essential for safety in electrical systems to prevent electric shocks.

• Examples of earthing systems include grounding rods, grounding pla

Insulators are materials that do not conduct electricity and are used to prevent the flow of current.

• Insulators are materials with high resistivity, such as rubber, glass, porcelain, and plastic.

• They are used to separate conductors in electrical systems to prevent short circuits.

• Insulators are crucial for safety in electrical installations to avoid electric shocks and fires.