Consider the following statements regarding the volute casing of a centrifugal pump: 1. Loss of head

Consider the following statements regarding the volute
casing of a centrifugal pump:

1. Loss of head due to change in the velocity is eliminated.

2. Efficiency of the pump is increased.

3. Water from the periphery of the impeller is collected and
transmitted to the pump at constant velocity.

Out of the above, the following statements are correct:

(a) 1, 2 and 3

(b) 1 and 2

(c) 2 and 3

(d) 1 and 3