Larsen & Toubro Limited Railway Engineer Interview Questions, Process, and Tips

A current transformer is a type of instrument transformer that is used to step down high currents to a lower, more manageable level for measurement or protection purposes.

• Current transformers are typically used in conjunction with ammeters, wattmeters, and protective relays.

• They have a primary winding that is connected in series with the circuit carrying the current to be measured, and a secondary winding that is conne...read more

Various types of motors are used in railway engineering, including traction motors, auxiliary motors, and HVAC motors.

• Traction motors are used to propel the train and are typically electric motors such as DC or AC induction motors.

• Auxiliary motors are used for powering various systems on the train, such as pumps, compressors, and fans.

• HVAC motors are used for heating, ventilation, and air conditioning systems on the tr...read more

A lighting arrester is a device used to protect electrical systems from lightning strikes by diverting the excess voltage to the ground.

• Lightning arresters are also known as surge arresters or lightning rods.

• They are typically installed at the top of buildings or structures to intercept lightning strikes.

• The arrester works by providing a low-resistance path for the lightning current to flow safely to the ground, protec...read more

Used batteries in substations are used for backup power in case of power outages or emergencies.

• Provide backup power during power outages

• Ensure continuous operation of critical systems

• Used in emergency situations

• Help maintain stability of the electrical grid

The capacity consumed by a battery bank depends on factors like load, battery size, efficiency, and discharge rate.

• Capacity consumption is influenced by the load connected to the battery bank.

• Battery size plays a crucial role in determining the total capacity available for consumption.

• Efficiency of the battery bank affects how much capacity is actually utilized.

• The discharge rate at which the battery bank is used also ...read more

An insulator is a material that does not conduct electricity, heat, or sound.

• Insulators are used to prevent the flow of electricity, heat, or sound in a specific direction.

• Common examples of insulators include rubber, glass, plastic, and ceramic.

• Insulators are important in electrical engineering to prevent short circuits and ensure safety.

• They are also used in construction to reduce heat transfer and noise transmission