# Bernoullis principle for constant total energy of system - Hydraulics & Pneumatics

**Q. Which of the following statements is/are true according to Bernoulli's principle?**

1. If a system has constant flow rate, change in cross-section area of the pipe affects the total energy of system

2. The change in cross-section has no effect on the total energy of the system and is constant if it has varying flow rate

3. A system has constant total energy, if flow rate is constant and change in cross-section has no effect on total energy

*- Published on 17 Aug 15***a.** Statement 1

**b.** Statement 2

**c.** Statement 3

**d.** all of the above

**ANSWER: Statement 3**