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**Problems : Module 3 - Convective Heat transfer: One dimensional, Heat Transfer**

**Frequently Asked Questions and Problems for Practice (Module 3)**

Q.1 | What is convection and how is it different than conduction? | ||||||||||||

Q.2 | What is heat transfer coefficient? Explain its physical significance. | ||||||||||||

Q.3 | What is film thickness? What is its relevance in the heat transfer operations? | ||||||||||||

Q.4 | Out of U_{i} and U_{o}, which one is larger in magnitude and why? | ||||||||||||

Q.5 | What is the concept of controlling resistance? | ||||||||||||

Q.6 | What is critical insulation thickness? Comment on the critical insulation thickness of a plane wall. | ||||||||||||

Q.7 | The temperature profile of a solid sphere is at steady state condition, the temperature Tis in | ||||||||||||

Q.8 | Steam at 170
Estimate the pay-back period assuming a rate of interest of 0.18/yr. |

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