MCQOPTIONS
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MCQOPTIONS
This section includes 25 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 laminar flow used in the smooth flow of a viscous liquid through a tube? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
The correlation for liquid metal is given by |
| A. | Nu = 0.465 (Re) (Pr) |
| B. | Nu = 0.565 (Re) (Pr) |
| C. | Nu = 0.665 (Re) (Pr) |
| D. | Nu = 0.765 (R |
| E. | (Pr)b) Nu = 0.565 (Re) (Pr)c) Nu = 0.665 (Re) (Pr)d) Nu = 0.765 (Re) (Pr) |
| Answer» C. Nu = 0.665 (Re) (Pr) | |
| 3. |
For a plate of length l, an average value of Nusselt number is given by |
| A. | Nu = 0.664 (Re) 0.5 (Pr) 0.54 |
| B. | Nu = 0.664 (Re) 0.5 (Pr) 0.74 |
| C. | Nu = 0.664 (Re) 0.5 (Pr) 0.27 |
| D. | Nu = 0.664 (R |
| E. | 0.5 (Pr) 0.54b) Nu = 0.664 (Re) 0.5 (Pr) 0.74c) Nu = 0.664 (Re) 0.5 (Pr) 0.27d) Nu = 0.664 (Re) 0.5 (Pr) 0.33 |
| Answer» E. 0.5 (Pr) 0.54b) Nu = 0.664 (Re) 0.5 (Pr) 0.74c) Nu = 0.664 (Re) 0.5 (Pr) 0.27d) Nu = 0.664 (Re) 0.5 (Pr) 0.33 | |
| 4. |
The local film coefficient for laminar flow past a flat plate may be obtained from the correlation |
| A. | Nu = 0.332 (Re) 0.5 (Pr) 0.33 |
| B. | Nu = 0.332 (Re) 0.5 (Pr) 0.43 |
| C. | Nu = 0.332 (Re) 0.5 (Pr) 0.53 |
| D. | Nu = 0.332 (R |
| E. | 0.5 (Pr) 0.33b) Nu = 0.332 (Re) 0.5 (Pr) 0.43c) Nu = 0.332 (Re) 0.5 (Pr) 0.53d) Nu = 0.332 (Re) 0.5 (Pr) 0.63 |
| Answer» B. Nu = 0.332 (Re) 0.5 (Pr) 0.43 | |
| 5. |
Air at atmospheric pressure and 20 degree Celsius flows with 6 m/s velocity through main trunck duct of air conditioning system. The duct is rectangular in cross-section and measures 40 cm by 80 cm. Determine heat loss per meter length of duct corresponding to unit temperature difference. The relevant thermos-physical properties of air arev = 15 * 10 -6 m 2/sα = 7.7 * 10 -2 m2/hrk = 0.026 W/m degree |
| A. | 32.768 W |
| B. | 42.768 W |
| C. | 52.768 W |
| D. | 62.768 W |
| Answer» C. 52.768 W | |
| 6. |
A horizontal heated plate at 200 degree Celsius and facing upwards has been placed in still air at 20 degree Celsius. If the plate measures 1.25 m by 1 m, make calculations for the heat loss by natural convection. The convective film coefficient for free convection is given by the following empirical relationh = 0.32 (α) 0.25 W/m2 KWhere α is the mean film temperature in degrees kelvin |
| A. | 6006 W |
| B. | 5006 W |
| C. | 4006 W |
| D. | 3006 W |
| Answer» B. 5006 W | |
| 7. |
A hot plate of 15 cm2 area maintained at 200 degree celsius is exposed to still air at 30 degree Celsius temperature. When the smaller side of the plate is held vertical, convective heat transfer rate is 15 per cent higher than bigger side of the plate is held vertical. Find size of the plate. The appropriate correlation for the convection coefficient isNu = 0.60 (Gr Pr) 0.25 |
| A. | l = 5.123 cm and b = 2.928 cm |
| B. | l = 6.123 cm and b = 3.928 cm |
| C. | l = 7.123 cm and b = 4.928 cm |
| D. | l = 8.123 cm and b = 5.928 cm |
| Answer» B. l = 6.123 cm and b = 3.928 cm | |
| 8. |
The Nusselt number is related to Reynolds number in laminar and turbulent flows respectively as |
| A. | R e-1/2 and R e0.8 |
| B. | R e1/2 and R e0.8 |
| C. | R e-1/2 and R e-0.8 |
| D. | R e1/2 and R e-0.8 |
| Answer» C. R e-1/2 and R e-0.8 | |
| 9. |
IS_LAMINAR_FLOW_USED_IN_THE_SMOOTH_FLOW_OF_A_VISCOUS_LIQUID_THROUGH_A_TUBE??$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
FOR_A_PLATE_OF_LENGTH_L,_AN_AVERAGE_VALUE_OF_NUSSELT_NUMBER_IS_GIVEN_BY?$ |
| A. | Nu = 0.664 (Re) <sup>0.5</sup> (Pr) <sup>0.54</sup> |
| B. | Nu = 0.664 (Re) <sup>0.5</sup> (Pr) <sup>0.74</sup> |
| C. | Nu = 0.664 (Re) <sup>0.5</sup> (Pr) <sup>0.27</sup> |
| D. | Nu = 0.664 (Re) <sup>0.5</sup> (Pr) <sup>0.33</sup> |
| Answer» E. | |
| 11. |
The_correlation_for_liquid_metal_is_given_by$ |
| A. | Nu = 0.465 (Re) (Pr) |
| B. | Nu = 0.565 (Re) (Pr) |
| C. | Nu = 0.665 (Re) (Pr) |
| D. | Nu = 0.765 (Re) (Pr) |
| Answer» C. Nu = 0.665 (Re) (Pr) | |
| 12. |
Is Reynolds number occurs below the critical value? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 13. |
The local film coefficient for laminar flow past a flat plate may be obtained from the correlatio? |
| A. | Nu = 0.332 (Re) <sup>0.5</sup> (Pr) <sup>0.33</sup> |
| B. | Nu = 0.332 (Re) <sup>0.5</sup> (Pr) <sup>0.43</sup> |
| C. | Nu = 0.332 (Re) <sup>0.5</sup> (Pr) <sup>0.53</sup> |
| D. | Nu = 0.332 (Re) <sup>0.5</sup> (Pr) <sup>0.63</sup> |
| Answer» B. Nu = 0.332 (Re) <sup>0.5</sup> (Pr) <sup>0.43</sup> | |
| 14. |
Is stokes exhibit at Reynolds number much less than 1? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 15. |
Is flow will transition from laminar to turbulent at a specific range of Reynolds number? |
| A. | False |
| B. | True |
| Answer» C. | |
| 16. |
For laminar flow, Prandtl number must be more than |
| A. | 0.05 |
| B. | 0.2 |
| C. | 0.6 |
| D. | 0.3 |
| Answer» D. 0.3 | |
| 17. |
Is Reynolds number is ratio of inertial force to viscous force? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 18. |
For laminar flow, Reynolds number must not be less than |
| A. | 1000 |
| B. | 2000 |
| C. | 20000 |
| D. | 40000 |
| Answer» E. | |
| 19. |
Is dimensionless Reynolds number is an important parameter? |
| A. | False |
| B. | True |
| Answer» C. | |
| 20. |
A horizontal heated plate at 200 degree Celsius and facing upwards has been placed in still air at 20 degree Celsius. If the plate measures 1.25 m by 1 m, make calculations for the heat loss by natural convection. The convective film coefficient for free convection is given by the following empirical relation |
| A. | <sup> 0.25</sup> W/m<sup>2</sup> K |
| B. | |
| C. | 6006 W |
| Answer» B. | |
| 21. |
Is laminar flow occurs at lower velocities? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 22. |
Which of the following is true for laminar flow? |
| A. | 10<sup>4</sup> < G <sub>r </sub>P <sub>r</sub> < 10<sup>7</sup> |
| B. | 10<sup>4</sup> < G <sub>r </sub>P <sub>r</sub> < 10<sup>8</sup> |
| C. | 10<sup>4</sup> < G <sub>r </sub>P <sub>r</sub> < 10<sup>9</sup> |
| D. | 10<sup>4</sup> < G <sub>r </sub>P <sub>r</sub> < 10<sup>10</sup> |
| Answer» D. 10<sup>4</sup> < G <sub>r </sub>P <sub>r</sub> < 10<sup>10</sup> | |
| 23. |
Is turbulent flow is a less orderly flow? |
| A. | False |
| B. | True |
| Answer» C. | |
| 24. |
Is motion of the particles of the fluid is very orderly in laminar flow? |
| A. | False |
| B. | True |
| Answer» C. | |
| 25. |
Is laminar flow occurs when fluid flows in parallel layers? |
| A. | True |
| B. | False |
| Answer» B. False | |