MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Transfer knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The relationship between the thermal and hydrodynamic boundary layer thickness is governed by the |
| A. | Peclet number |
| B. | Prandtl number |
| C. | Stanton number |
| D. | Fourier number |
| Answer» C. Stanton number | |
| 2. |
The assumptions for thermal boundary layer are(i) Steady compressible flow(ii) Negligible body forces, viscous heating and conduction in the flow direction(iii) Constant fluid properties evaluated at the film temperatureIdentify the correct option |
| A. | i and iii |
| B. | i, ii and iii |
| C. | ii and iii |
| D. | i and ii |
| Answer» D. i and ii | |
| 3. |
Consider an elemental control volume for mass balance continuity equation. Which one of the following is correct? |
| A. | Value of 1 is 2 v + d u/d x (d y) |
| B. | Value of 2 is u + d u/d y (d x) |
| C. | Value of 1 is v + d u/d x (d y) |
| D. | Value of 2 is 2 u + d v/d x (d x) |
| Answer» D. Value of 2 is 2 u + d v/d x (d x) | |
| 4. |
THE_RELATIONSHIP_BETWEEN_THE_THERMAL_AND_HYDRODYNAMIC_BOUNDARY_LAYER_THICKNESS_IS_GOVERNED_BY_THE?$ |
| A. | Peclet number |
| B. | Prandtl number |
| C. | Stanton number |
| D. | Fourier number |
| Answer» C. Stanton number | |
| 5. |
The assumptions for thermal boundary layer ar? |
| A. | Steady compressible flow |
| B. | Negligible body forces, viscous heating and conduction in the flow direction |
| C. | Constant fluid properties evaluated at the film temperature |
| Answer» D. | |
| 6. |
The differential energy equation for flow past a flat plate is given by |
| A. | u d t/d x + v d t/d y = µ/p c (d u/d y) <sup>2</sup> + k d <sup>2 </sup>t/p c d y <sup>2</sup> |
| B. | u d t/d x + v d t/d y = µ/p c (d u/d y) + k d <sup>2 </sup>t/p c d y <sup>2</sup> |
| C. | u d t/d x + v d t/d y = k d <sup>2 </sup>t/p c d y <sup>2</sup> + µ/p c (d u/d y) <sup>-2</sup> |
| D. | u d t/d x + v d t/d y = µ/p c (d u/d y) <sup>-1</sup> + k d <sup>2 </sup>t/p c d y <sup>2</sup> |
| Answer» B. u d t/d x + v d t/d y = ¬¨¬®¬¨¬µ/p c (d u/d y) + k d <sup>2 </sup>t/p c d y <sup>2</sup> | |
| 7. |
Which is true for two dimensional boundary layer? |
| A. | d u/d x – d v/d y = 1 |
| B. | d u/d x – d v/d y = 0 |
| C. | d u/d x + d v/d y = 1 |
| D. | d u/d x + d v/d y = 0 |
| Answer» E. | |
| 8. |
The velocity profile of the hydrodynamic boundary layer is dependent upon |
| A. | Time |
| B. | Viscosity |
| C. | Temperature |
| D. | Mass |
| Answer» C. Temperature | |
| 9. |
The convection of energy reduces the outward conduction in the fluid so temperature gradient |
| A. | Decreases |
| B. | Increases |
| C. | Constant |
| D. | Becomes twice |
| Answer» B. Increases | |
| 10. |
The thickness of thermal boundary layer is arbitrarily defined as the distance from the plate surface at which |
| A. | t <sub>S</sub> – t/t <sub>S </sub>– t <sub>INFINITY </sub>= 0.34 |
| B. | t <sub>S</sub> – t/t <sub>S </sub>– t <sub>INFINITY </sub>= 0.10 |
| C. | t <sub>S</sub> – t/t <sub>S </sub>– t <sub>INFINITY </sub>= 0.99 |
| D. | t <sub>S</sub> – t/t <sub>S </sub>– t <sub>INFINITY </sub>= 0.87 |
| Answer» D. t <sub>S</sub> ‚Äö√Ñ√∂‚àö√ë‚àö¬® t/t <sub>S </sub>‚Äö√Ñ√∂‚àö√ë‚àö¬® t <sub>INFINITY </sub>= 0.87 | |
| 11. |
The zone or thin layer wherein the temperature field exists is called the |
| A. | Single boundary layer |
| B. | Multi boundary layer |
| C. | Hydrodynamic boundary layer |
| D. | Thermal boundary layer |
| Answer» E. | |
| 12. |
Which field is set up when a fluid flows past a heated or cold surface? |
| A. | Energy |
| B. | Temperature |
| C. | Mass |
| D. | Time |
| Answer» C. Mass | |