TCS Interview Questions and Answers

There are four main components used in making cement.

• Limestone

• Clay

• Silica

• Iron oxide

Role of DP in Vrm and ball mill is to control the differential pressure between the inlet and outlet of the mill to ensure proper operation.

• DP stands for Differential Pressure.

• In VRM (Vertical Roller Mill) and ball mill, DP is used to monitor and control the pressure difference between the inlet and outlet of the mill.

• Maintaining the correct DP is crucial for efficient grinding and preventing blockages in the mill.

• DP can be adjusted by regulating the mill fan speed or adjusti...read more

The baghouse used is a pulse jet baghouse.

• Pulse jet baghouses are commonly used in industries for air pollution control.

• They use high-pressure air pulses to clean the bags and remove the collected dust.

• Examples of industries using pulse jet baghouses include cement plants, steel mills, and woodworking facilities.

VRM is a vertical roller mill used for grinding raw materials into cement while a ball mill is used for grinding raw materials into fine powder.

• VRM uses pressure and shear generated between the rollers and the rotating table to crush and grind raw materials.

• Ball mill uses impact and attrition between grinding balls and ore particles to crush and grind materials.

• VRM is more energy-efficient and has a higher grinding capacity compared to a ball mill.

• Ball mill is more suitable f...read more

Blaine is a measure of fineness of cement particles, while residue is the material left on a sieve after cement is passed through it.

• Blaine is a measure of the surface area of cement particles, indicating their fineness.

• Residue is the material left on a sieve after cement is passed through it, indicating the amount of coarse particles in the cement.

• Blaine value is typically expressed in cm²/g, with higher values indicating finer particles.

• Residue is usually expressed as a per...read more