Larsen & Toubro Limited Electrical Foreman Interview Questions and Answers

DOL starter stands for Direct-On-Line starter, used to start motors by directly connecting them to the power supply.

• DOL starter is the simplest and most common type of motor starter.

• It directly connects the motor to the power supply without any intermediate starting method.

• It provides full voltage to the motor during starting, which can cause high inrush current.

• DOL starters are suitable for small to medium-sized motor...read more

APFC PANEL stands for Automatic Power Factor Correction Panel, used to maintain power factor in electrical systems.

• APFC PANEL automatically monitors and corrects the power factor of electrical systems.

• It helps in reducing electricity bills by maintaining a high power factor.

• APFC PANELs are commonly used in industries and commercial buildings.

• They consist of capacitors that are switched on and off based on the load requ...read more

ATS stands for Automatic Transfer Switch. It is used to transfer power supply between two sources. Transformer and motor maintenance procedures and protection methods are essential for their efficient operation. SAP is a software used for enterprise resource planning.

• ATS is used to automatically switch power supply between two sources, ensuring uninterrupted power supply.

• Transformer maintenance involves regular inspect...read more

HT motor rating is the maximum power it can handle and FLC is the current it draws at full load.

• HT motor rating is expressed in kilowatts (kW) or megawatts (MW).

• FLC of HT motor is the full load current it draws at rated voltage and frequency.

• FLC is expressed in amperes (A) and varies depending on the motor's power rating and efficiency.

• For example, a 1 MW HT motor may have a FLC of 1000 A at 11 kV.

• The rating and FLC of...read more

Plant EHT system and single line diagram of plants.

• EHT system refers to Extra High Tension system used in power plants

• Single line diagram shows the electrical connections between different components

• It is important to have a clear and accurate diagram for safety and maintenance purposes

Harness routing involves planning the layout of electrical cables for optimal performance and safety in devices.

• Minimize bends and twists to reduce signal loss and wear on cables.

• Maintain separation between power and signal wires to prevent interference.

• Use protective conduits in high-stress areas to enhance durability.

• Consider thermal management by routing away from heat sources.

• Plan for accessibility to facilitate ma