L&T Realty Interview Questions and Answers

NF and 2NF are normal forms in database design. Cookies are small text files stored on a user's device. Digital signature and SSL are security measures for online communication.

• NF stands for Normal Form and is used in database design to ensure data is organized and free of redundancy.

• 2NF is a higher level of normalization that ensures each non-key attribute is dependent on the entire primary key.

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Induction motors are commonly used in thermal power plants.

• Induction motors are preferred due to their simplicity, reliability, and low cost.

• They are used for driving pumps, fans, compressors, and other auxiliary equipment in thermal power plants.

• Synchronous motors are also used for applications requiring precise speed control.

• DC motors may be used in some specific cases where variable speed control is needed.

Water has poor dielectric properties and can cause electrical failures in transformers.

• Water has poor dielectric properties, which can lead to electrical failures in transformers.

• Water can cause corrosion and rusting of transformer components.

• Water can also lead to insulation breakdown and reduced efficiency of the transformer.

• Mineral oil or synthetic esters are commonly used for transformer cooling due to their better dielectric properties.

Generator terminal voltage in a 210 MW unit is typically around 20-24 kV.

• Generator terminal voltage is usually maintained within a specific range to ensure proper functioning of the unit

• The voltage can vary based on the specific design and configuration of the generator

• In a 210 MW unit, the terminal voltage is typically around 20-24 kV

Major motors in a thermal power plant include boiler feed pump motor, forced draft fan motor, induced draft fan motor, and condensate extraction pump motor.

• Boiler feed pump motor: used to pump feedwater into a boiler

• Forced draft fan motor: used to supply air to the furnace for combustion

• Induced draft fan motor: used to remove flue gases from the furnace

• Condensate extraction pump motor: used to extract condensate from the condenser