Mechanical Engineering : Heat Transfer QUESTIONS AND ANSWERS :: part3 : 21 to 25
Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
21.Fourier's law of heat conduction is valid for |
| one dimensional cases only |
| two dimensional cases only |
| three dimensional cases only |
| regular surfaces having non-uniform temperature gradients |
| irregular surfaces. |
22.According to Wien's law, the wavelength corresponding to maximum energy is proportion to |
| absolute temperature (T) |
| I2 |
| f |
| t |
| 1/r. |
23.The thermal diffusivities for solids are generally |
| less than those for gases |
| jess than those for liquids |
| more than those for liquids and gases |
| more or less same as for liquids and gases |
| zerci. |
24.In counter flow heat exchangers |
| both the fluids at inlet (of heat exchanger where hot fluid enters) are in their coldest state |
| both the fluids at inlet are in their hottest state |
| both the fluids .at exit are in their hottest state |
| one fluid is in hottest state and other in coldest state at inlet |
| any combination is possible depending on design of heat exchanger. |
25.Stefan Boltzmann law is applicable for heat transfer by |
| conduction |
| convection |
| radiation |
| conduction and radiation combined |
| convection and radiation combined. |
More Heat Transfer QUESTIONS AND ANSWERS available in next pages
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