Larsen & Toubro Limited Electrical Technician 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

Synchronous motors operate at a constant speed determined by the frequency of the power source.

• Synchronous motors have a rotor that rotates at the same speed as the rotating magnetic field in the stator.

• They are used in applications where constant speed is required, such as in industrial processes or power generation.

• Synchronous motors are more efficient than induction motors at higher loads.

• They require a separate DC ...read more

Induction motors rely on induction to produce torque, while synchronous motors require a magnetic field to rotate at a constant speed.

• Induction motors do not require any external connections to the rotor, while synchronous motors need a DC power source to create the magnetic field.

• Induction motors are self-starting, while synchronous motors require external means to start.

• Induction motors are more commonly used in indu...read more