Mechanical Engineering : Heat Transfer QUESTIONS AND ANSWERS :: part3 : 6 to 10
Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
6.Thermal diffusivity of a substance is |
| directly proportional to thermal conductivity |
| inversely proportional to density of substance |
| inversely proportional to specific heat |
| all of the above |
| none of the above. |
7.The thermal diffusivities for gases are generally |
| more than those for liquids |
| less than those for liquids |
| more than those for solids |
| dependent on the viscosity |
| same as for the liquids. |
8.Log mean temperature difference in case of counter flow compared to parallel flow will be |
| same |
| more |
| less |
| depends on other factors |
| none of the above. |
9.According of Kirchhoff law, |
| radiant heat is proportional to fourth power of absolute temperature |
| emissive power depends on temperature |
| emissive power and absorptivity are constant for all bodies |
| ratio of emissive power to absorptive power is maximum for perfectly black body |
| ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body. |
10.Joule sec is the unit of |
| universal gas constant |
| kinematic viscosity |
| thermal conductivity |
| Planck's constant |
| none of the above. |
More Heat Transfer QUESTIONS AND ANSWERS available in next pages
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