The head-discharge characteristic curve of two centrifugal pumps in 1. parallel can be obtained by doubling the ordinates 2. series can be obtained by doubling the abscissa Which of these statements is/are correct?
- A2 alone
- B1 alone
- CNeither 1 nor 2Correct
- DBoth 1 and 2
Solution
Concept
Combined characteristics
Step-by-step solution
1. Parallel: add discharges at the same head (double the abscissa). 2. Series: add heads at the same discharge (double the ordinate). 3. Both statements are reversed.
Explanation
In parallel the abscissa (Q) doubles, in series the ordinate (H) doubles.
Why the other options are wrong
Options with 1 or 2 are wrong.
Shortcut
Parallel: ΣQ; series: ΣH.
Correct answer: C) Neither 1 nor 2