HPCL Rajasthan Refinery Interview Questions, Process, and Tips

Stress and strain are measures of the internal forces within a material. Stress is the force applied per unit area, while strain is the deformation of the material.

• Stress is the force applied per unit area on a material, measured in units like Pascals or pounds per square inch.

• Strain is the deformation or change in shape of a material due to stress, measured as a ratio of the change in length to the original length.

• Str...read more

Fatigue failure is the weakening and eventual breaking of a material under repeated or fluctuating stress.

• Occurs due to repeated or fluctuating stress on a material

• Can lead to cracks, fractures, or complete failure

• Common in metal structures like bridges, aircraft, and machinery

Static loads do not change with time, while dynamic loads involve at least one changing parameter. Fatigue failure occurs when a body is subjected to continuous dynamic loading.

• Static loads have constant force magnitude, direction, and point of application

• Dynamic loads involve changes in at least one of the load parameters over time

• Fatigue failure occurs when a body is subjected to continuous dynamic loading, leading t...read more

NPSH of a pump stands for Net Positive Suction Head, which is a measure of the pressure available at the suction port of the pump.

• NPSH is important for determining if a pump will operate properly without cavitation.

• It is calculated by subtracting the vapor pressure of the fluid from the total suction head of the pump.

• NPSH is typically provided by the pump manufacturer and must be greater than the required NPSH for the