LOREAL Interview Questions and Answers

The color code of 3-phase supply varies depending on the country and electrical standards.

• In the United States, the color code for 3-phase supply is typically black, red, and blue.

• In Europe, the color code is often brown, black, and gray.

• Other countries may have different color codes, so it is important to consult local electrical standards.

• The color coding helps identify the different phases and ensure proper electrical connections.

Star and delta connections are two common methods used to connect three-phase electrical systems.

• Star connection, also known as Wye connection, is formed by connecting all three phases together at a common point and connecting the other ends to the respective loads.

• Delta connection, also known as Mesh connection, is formed by connecting the end of one phase to the start of the next phase in a circular loop.

• Star connection provides a neutral point and is commonly used in power...read more

A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.

• Transformers are used to increase or decrease the voltage of an alternating current (AC) power supply.

• They consist of two or more coils of wire, known as windings, that are wound around a core made of magnetic material.

• The primary winding is connected to the power source, while the secondary winding is connected to the load.

• When an alternating ...read more

Voltage neutral refers to the point in an electrical system where the voltage is close to zero.

• Voltage neutral is the reference point in an electrical circuit where the voltage is considered to be zero.

• It is typically the midpoint between the positive and negative terminals of a power source.

• In a balanced three-phase system, the neutral conductor carries the current resulting from the imbalance of the three phases.

• The voltage neutral is important for ensuring proper functioni...read more

Improving power factor involves reducing reactive power and increasing the ratio of real power to apparent power.

• Install power factor correction capacitors to offset reactive power.

• Avoid using inefficient or oversized motors and equipment.

• Implement energy-efficient lighting systems.

• Optimize the operation of power factor correction equipment.

• Educate employees on energy conservation practices.