MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Aerodynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Select the incompressible flow out of the following. |
| A. | High speed gaseous flow |
| B. | M=5 |
| C. | M=3 |
| D. | Liquid flow |
| Answer» E. | |
| 2. |
Mach number is defined as the ratio of local flow velocity to the _______ |
| A. | Speed of sound in vacuum |
| B. | Local speed of sound |
| C. | Speed of light |
| D. | Speed of sound at 25 C |
| Answer» C. Speed of light | |
| 3. |
The best estimate of whether the flow is compressible or not comes from ______ |
| A. | Pressure |
| B. | Mach number |
| C. | Compressibility values |
| D. | Experiments |
| Answer» C. Compressibility values | |
| 4. |
Gaseous flow over an airfoil is always compressible because of very high compressibility value of gases. |
| A. | Always true |
| B. | Always false |
| C. | True only for high speeds |
| D. | True for low speeds |
| Answer» D. True for low speeds | |
| 5. |
For the flow over an airfoil, which of the following is the incorrect statement if the fluid is liquid? |
| A. | High pressure change |
| B. | Incompressible fluid |
| C. | Compressibility is very small |
| D. | Density is constant |
| Answer» B. Incompressible fluid | |
| 6. |
In terms of compressibility, the density change when pressure of the fluid increases is ______ |
| A. | Density increases |
| B. | Density decreases |
| C. | Density is constant |
| D. | Insufficient data |
| Answer» B. Density decreases | |
| 7. |
T and S are precise thermodynamic properties of the gas and the values can be obtained easily. |
| A. | True always |
| B. | False always |
| Answer» B. False always | |
| 8. |
The isothermal compressibility for a gas is same as isothermal compressibility. |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
The subscript T in the formula for compressibility symbolize that temperature of the gas is kept constant in the process. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
Which of these is not true when a gas is compressed in a bicycle pump? |
| A. | Temperature increases |
| B. | Pressure increases |
| C. | Volume increases |
| D. | Heat is exchanged |
| Answer» D. Heat is exchanged | |
| 11. |
In physical sense, compressibility is the fractional change in volume of the fluid element per unit change in_____ |
| A. | Mass |
| B. | Temperature |
| C. | Pressure |
| D. | Density |
| Answer» D. Density | |
| 12. |
What is the most compressible substance of the following? |
| A. | Salt |
| B. | Liquid oxygen |
| C. | Water |
| D. | Laughing gas |
| Answer» E. | |