question_answer

Consider the following statements in respect of centrifugal pumps:

1. Head developed is proportional to the square of the speed of rotation.

2. Backward curved bladed impellers arc generally used in centrifugal pumps.

3. These pumps generally do not require priming.

4. Multistage pumps would give higher discharge proportional to the number of stages. Which of these statements are correct?

A) 1 and 2            

B) 2 and 3

C) 3 and 4            

D) 1 and 4