Q1: Volute casing of a centrifugal pump does not facilitate

ANS:D - conversion of the part of the pressure head to velocity head.

The volute casing of a centrifugal pump does not facilitate conversion of the part of the velocity head to the pressure head. In a centrifugal pump, the volute casing serves several important functions, including:

1. Uniform Flow: The volute casing helps to guide the flow of fluid coming out of the impeller and convert some of the kinetic energy of the fluid into pressure energy. This helps to create a more uniform flow profile and reduce turbulence.
2. Increase in Pump Efficiency: By efficiently converting kinetic energy into pressure energy, the volute casing contributes to the overall efficiency of the pump by ensuring that a greater proportion of the input power is transferred to the fluid as useful work.
3. Conversion of Pressure Head to Velocity Head: As the fluid flows through the volute casing, the increasing cross-sectional area of the casing allows the fluid velocity to decrease while the pressure increases. This results in the conversion of some of the pressure head (pressure energy) to velocity head (kinetic energy) as the fluid exits the pump discharge.

However, the volute casing does not facilitate the conversion of velocity head to pressure head. Instead, it performs the opposite function by converting some of the kinetic energy (velocity head) of the fluid into pressure energy (pressure head) as the fluid flows through the casing. Therefore, the correct statement is: conversion of the part of the velocity head to the pressure head.