ANS:A - kinetic head gets converted into static head.

The volute of a centrifugal pump should be designed in a fashion such that the kinetic energy of the fluid gets converted into pressure energy (static head).

Explanation:

1. Kinetic Head to Static Head Conversion:
   • As the fluid exits the impeller of a centrifugal pump, it possesses kinetic energy due to its velocity.
   • The volute casing of the pump is designed to gradually convert this kinetic energy into pressure energy (static head).
   • This conversion is achieved by allowing the fluid to decelerate and expand in the volute, thereby increasing the pressure of the fluid while reducing its velocity.
2. Moving Stream Gradually Reduces Velocity:
   • This statement is partially correct but does not fully describe the purpose of the volute. While the fluid does reduce velocity in the volute, the primary objective is to convert kinetic energy into pressure energy, not solely to reduce velocity.
3. Mean Velocity Remains Constant:
   • This statement is incorrect. In the volute, the velocity of the fluid typically decreases as kinetic energy is converted into pressure energy. The mean velocity does not necessarily remain constant; it decreases as pressure increases.
4. None of These:
   • This option would be incorrect because the purpose of the volute in a centrifugal pump is indeed to convert kinetic energy into pressure energy.

Conclusion: