NMDC Limited Erection & Commissioning Engineer Interview Questions and Answers

SF6 gas is used in GIS due to its excellent insulating properties and high dielectric strength.

• SF6 gas has high dielectric strength, making it an excellent insulator for high voltage equipment like GIS

• SF6 gas is non-toxic, non-flammable, and chemically stable, making it a safe choice for GIS

• SF6 gas has a high global warming potential, but its use in GIS is tightly regulated to minimize emissions

• Other gases like nitroge...read more

Various types of conductors are used in transmission lines depending on the application.

• Aluminum conductors are commonly used due to their lightweight and low cost.

• Copper conductors are used in high voltage and high current applications.

• ACSR (Aluminum Conductor Steel Reinforced) conductors are used for long distance transmission lines.

• High-temperature conductors like AAAC (All Aluminum Alloy Conductors) are used in are...read more

Press filter is a device used for separating solids from liquids.

• It works by applying pressure to the mixture to force the liquid through a filter media while retaining the solids.

• It is commonly used in industries such as chemical, pharmaceutical, and food processing.

• Examples of press filters include belt filter press, plate and frame filter press, and rotary vacuum-drum filter.

• Press filters are efficient and cost-effe...read more

To maintain pressure in press filter, ensure proper sealing, check for leaks, and adjust feed rate and pressure settings.

• Check for proper sealing of the filter plates and gaskets

• Inspect for any leaks in the system and repair them promptly

• Adjust the feed rate and pressure settings as per the manufacturer's recommendations

• Regularly clean and maintain the filter to prevent clogging and pressure drop

• Monitor the pressure ga...read more

The model of hydraulic cylinder in press filter depends on the specific press filter being used.

• The model of hydraulic cylinder can vary depending on the size and capacity of the press filter.

• Some common models of hydraulic cylinders used in press filters include tie rod cylinders and welded cylinders.

• The specific model of hydraulic cylinder used in a press filter can be determined by consulting the manufacturer's spec...read more

Roller bearings are commonly used in bogie wheels.

• Roller bearings are preferred over plain bearings due to their ability to handle heavy loads and reduce friction.

• Tapered roller bearings are commonly used in locomotive bogie wheels.

• Cylindrical roller bearings are also used in some bogie wheels.

• The type of bearing used depends on the specific application and load requirements.