MCQOPTIONS
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MCQOPTIONS
This section includes 24 Mcqs, each offering curated multiple-choice questions to sharpen your Aerodynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Is turbulence flow is irregular? |
| A. | False |
| B. | True |
| Answer» C. | |
| 2. |
Is surface is perturb the boundary layer and promote turbulence? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
Consider the above problem, find the value of Nusselt number |
| A. | 40.46 |
| B. | 50.56 |
| C. | 60.66 |
| D. | 70.76 |
| Answer» B. 50.56 | |
| 4. |
Air flows through a 10 cm internal diameter tube at the rate of 75 kg/hr. Measurements indicate that at a particular point in the tube, the pressure and temperature of air are 1.5 bar and 325 K whilst the tube wall temperature is 375 K. Find heat transfer rate from one meter length in the region of this pointThe general non-dimensional correlation for turbulent flow in the tube isNu = 0.023 (Re) 0.8 (Pr) 0.4Where the fluid properties are evaluated at the bulk temperature |
| A. | 147.35 W |
| B. | 157.35 W |
| C. | 167.35 W |
| D. | 177.35 W |
| E. | 0.8 (Pr) 0.4Where the fluid properties are evaluated at the bulk temperaturea) 147.35 Wb) 157.35 Wc) 167.35 Wd) 177.35 W |
| Answer» E. 0.8 (Pr) 0.4Where the fluid properties are evaluated at the bulk temperaturea) 147.35 Wb) 157.35 Wc) 167.35 Wd) 177.35 W | |
| 5. |
The oil pan of 1.6 engine approximates a flat plate 0.3 m wide by 0.45 m long and protrudes below the framework of the automobile. The engine oil is at 95 degree Celsius and the ambient air temperature is 35 degree Celsius. If the automobile runs at 36 km/hr, make calculations for the rate of heat transfer from the oil-pan surface. Assume negligible resistance to conduction through the oil pan |
| A. | 190.37 W |
| B. | 180.37 W |
| C. | 170.37 W |
| D. | 160.37 W |
| Answer» D. 160.37 W | |
| 6. |
Investigate the effect of following condition on the average value of heat transfer coefficient in flow through a tubeTwo fold increases in flow velocity by varying mass flow rateIt may be presumed that there is no change in the temperature of the liquid and the tube wall, and that the flow through the tube is turbulent in character |
| A. | 64.1% decrease |
| B. | 64.1% increase |
| C. | 74.1%decrease |
| D. | 74.1% increases |
| Answer» E. | |
| 7. |
Which of the following is true for turbulent flow? |
| A. | G r P r > 108 |
| B. | G r P r > 109 |
| C. | G r P r > 103 |
| D. | G r P r > 1015 |
| Answer» C. G r P r > 103 | |
| 8. |
IS_SURFACE_IS_PERTURB_THE_BOUNDARY_LAYER_AND_PROMOTE_TURBULENCE??$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
Consider the above problem, find the value of Nusselt number$ |
| A. | 40.46 |
| B. | 50.56 |
| C. | 60.66 |
| D. | 70.76 |
| Answer» B. 50.56 | |
| 10. |
Is_turbulence_flow_is_irregular?$ |
| A. | False |
| B. | True |
| Answer» C. | |
| 11. |
The oil pan of 1.6 engine approximates a flat plate 0.3 m wide by 0.45 m long and protrudes below the framework of the automobile. The engine oil is at 95 degree Celsius and the ambient air temperature is 35 degree Celsius. If the automobile runs at 36 km/hr, make calculations for the rate of heat transfer from the oil-pan surface. Assume negligible resistance to conduction through the oil pa? |
| A. | 190.37 W |
| B. | 180.37 W |
| C. | 170.37 W |
| D. | 160.37 W |
| Answer» D. 160.37 W | |
| 12. |
Is flow over a golf ball is stationary? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 13. |
Consider the above problem, find the value of Reynolds number |
| A. | 166003 |
| B. | 177003 |
| C. | 188003 |
| D. | 199003 |
| Answer» B. 177003 | |
| 14. |
Example of turbulent flow? |
| A. | Smoking rises from cigarette |
| B. | Flow on a symmetric airfoil |
| C. | Laminar flow |
| D. | Turbulent flow on the airfoil |
| Answer» B. Flow on a symmetric airfoil | |
| 15. |
A heat treat steel plate measures 3 m by 1 m and is initially at 30 degree Celsius. It is cooled by blowing air parallel to 1 m edge at 9 km/hr. If the air is at 10 degree Celsius. Estimate the convection heat transfer from both sides of the plate |
| A. | 477.7 W |
| B. | 547.7 W |
| C. | 647.7 W |
| D. | 747.6 W |
| Answer» E. | |
| 16. |
Is Reynolds number is used to predict the turbulence? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 17. |
Calculate the rate of heat loss from a human body which may be considered as a vertical cylinder 30 cm in diameter, and 175 cm high while standing in a 30 km/hr wind at 15 degree Celsius. Human has a surface temperature of 35 degree Celsius |
| A. | 588.86 W |
| B. | 688.86 W |
| C. | 788.86 W |
| D. | 888.86 W |
| Answer» C. 788.86 W | |
| 18. |
Is laminar flow is used to increase the drag and reduce the lift? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 19. |
Consider the above problem for two fold increase in the diameter of the tube, the flow velocity is maintained constant by change in the rate of liquid flow |
| A. | 15% |
| B. | 14% |
| C. | 13% |
| D. | 12% |
| Answer» D. 12% | |
| 20. |
Is unsteady vortices appears at turbulent flow? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 21. |
Is turbulence is caused by excessive kinetic energy? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 22. |
Mc Adam relation is given by |
| A. | Nu = 0.023 (Re) <sup>0.8 </sup>(Pr) <sup>0.4</sup> |
| B. | Nu = 0.023 (Re) <sup>0.8 </sup>(Pr) <sup>0.3</sup> |
| C. | Nu = 0.023 (Re) <sup>0.8 </sup>(Pr) <sup>0.2</sup> |
| D. | Nu = 0.023 (Re) <sup>0.8 </sup>(Pr) <sup>0.1</sup> |
| Answer» B. Nu = 0.023 (Re) <sup>0.8 </sup>(Pr) <sup>0.3</sup> | |
| 23. |
Is turbulence is observed in the surf? |
| A. | False |
| B. | True |
| Answer» C. | |
| 24. |
Is turbulent flow is characterized by chaotic changes in pressure and flow velocity? |
| A. | True |
| B. | False |
| Answer» B. False | |