Two centrifugal pumps P and R are available for use in a pipe flow system and their head-discharge characteristics are as follows.
|
Pump P |
Pump R |
||
|
Discharge |
Head |
Discharge |
Head |
|
0 |
40 |
0 |
45 |
|
0.12 |
35 |
0.14 |
40 |
|
0.2 |
28 |
0.24 |
35 |
|
0.3 |
18 |
0.3 |
28 |
The following statements (S1, S2, and S3) pertain to the head and discharge values during actual operation. Neglect losses in the system.
Which of the following statements are correct?
S1: When the two pumps P and R are connected in parallel, the discharge is 0.36 cumecs corresponding to a head of 35 m.
S2: When the two pumps P and R are connected in parallel, the discharge is 0.36 cumecs corresponding to a head of 70 m.
S3: When the two pumps P and R are connected in series, the discharge is 0.3 cumecs corresponding to a head of 46 m.