Larsen & Toubro Limited Service Engineer Interview Questions and Answers

There are two types of fuel systems in IC engines: carburetor and fuel injection.

• Carburetor fuel system mixes fuel and air before entering the engine.

• Fuel injection system directly injects fuel into the combustion chamber.

• Examples of carburetor fuel systems include older cars and motorcycles.

• Examples of fuel injection systems include modern cars and motorcycles.

Check hydraulic fluid levels, inspect swing motor, test swing motor solenoid, check for electrical issues

• Check hydraulic fluid levels to ensure there is enough fluid for proper operation

• Inspect the swing motor for any signs of damage or wear that may be causing the issue

• Test the swing motor solenoid to see if it is functioning correctly

• Check for any electrical issues that may be affecting the operation of the swing mechanism

Yes, I am familiar with hydraulic circuits and their components.

• Understanding the basic components of a hydraulic circuit such as pumps, actuators, valves, and reservoirs

• Knowledge of how hydraulic circuits work to transmit power using fluid pressure

• Ability to troubleshoot and repair issues in hydraulic circuits

• Experience in designing and maintaining hydraulic systems

• Familiarity with hydraulic symbols and diagrams

IC Engine work refers to the process of converting chemical energy into mechanical energy in an internal combustion engine.

• IC Engine work involves the combustion of fuel inside the engine to produce power.

• The process includes four strokes: intake, compression, combustion, and exhaust.

• The work is performed by pistons, connecting rods, crankshafts, and valves.

• Examples of IC engines include gasoline engines, diesel engines, and rotary engines.

SCR stands for Selective Catalytic Reduction, a technology used to reduce nitrogen oxide emissions in diesel engines.

• SCR uses a catalyst to convert harmful nitrogen oxides into nitrogen, water, and small amounts of carbon dioxide.

• It requires a reducing agent, typically urea, to initiate the chemical reaction.

• The urea solution is injected into the exhaust stream where it reacts with the nitrogen oxides in the presence of the catalyst.

• The end result is cleaner emissions that me...read more

IGBT stands for Insulated Gate Bipolar Transistor. It is a power semiconductor device used for switching applications.

• IGBT combines the advantages of both MOSFET and bipolar transistors.

• It is commonly used in high power applications such as motor drives, inverters, and power supplies.

• IGBTs have three terminals: gate, collector, and emitter.

• They are used for switching high voltage and high current loads.

• Example: IGBTs are used in electric vehicles to control the power flow fro...read more