MCQOPTIONS
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MCQOPTIONS
This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Fluid Mechanics Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The below figure shows a pipe with a circular cross section of diameter 5 cm on the left end and a square cross section with diagonal 5 cm on the right end. Water enters the left end with a velocity 20 m/s and leaves the right end with a velocity V2. Find V2 (neglect losses in the pipe). |
| A. | V2 cannot be found as the length of the pipe is not given |
| B. | V2 cannot be found as the intermediate cross sections are not given. |
| C. | 31.41 m/s |
| D. | 20 m/s |
| Answer» D. 20 m/s | |
| 2. |
If compressibility force and surface tension force are neglected from the Newton’s second law of motion, which of the following equations result? |
| A. | Navier-Stokes equation |
| B. | Euler’s equation |
| C. | Bernoulli’s equation |
| D. | Reynolds equation |
| Answer» E. | |
| 3. |
A student wishes to find the velocity of air flowing through a pipe. He has a pressure gauge which displays only the dynamic pressure. The pressure gauge reads 0.018 mm Hg. Assume density of air to be 1.225 kg/m3, find the velocity V of air (ρHg = 13600 kg/m3). |
| A. | 4 m/s |
| B. | 2 m/s |
| C. | 20 m/s |
| D. | 40 m/s |
| Answer» C. 20 m/s | |
| 4. |
A water flows through a pipe at a velocity 2 m/s. The pressure gauge reading is 2 bar. The datum head is given to be 2 m. Find the piezometric head. (Assume all Bernoulli’s assumptions, Density of water = 1000 kg/m3, g = 9.8 m/s2). |
| A. | 22.4 m |
| B. | 22.6 m |
| C. | 20.4 m |
| D. | 20.6 m |
| Answer» B. 22.6 m | |
| 5. |
The Bernoulli’s equation in fluid dynamics is valid for _________ |
| A. | Compressible flows |
| B. | Transient flows |
| C. | Continuous flows |
| D. | Viscous flows |
| Answer» D. Viscous flows | |