Mechanical Engineering : Heat Transfer QUESTIONS AND ANSWERS :: part2 : 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.In heat transfer, conductance equals conductivity (kcal/hr/sqm/�C/cm) divided by |
| hr (time) |
| sqm (area) |
| �C (temperature) |
| cm (thickness) |
| kcal (heat). |
22.Thermal conductivity of glass-wool varies from sample to sample because of variation in |
| composition |
| density |
| porosity |
| structure |
| all of the above. |
23.Moisture would find its way into insulation by vapour pressure unless it is prevented by |
| high thickness of insulation |
| high vapour pressure |
| less thermal conductivity insulator |
| a vapour seal |
| all of the above. |
24.The amount of heat flow through a body by conduction is |
| directly proportional to the surface area of the body |
| directly proportional to the temperature difference on the two faces of the body |
| dependent upon the material of the body |
| inversely proportional to the thickness of the body |
| all of the above. |
25.Thermal diffusivity of a substance is . |
| proportional of thermal conductivity |
| inversely proportional to k |
| proportional to (kf |
| inversely proportional to k2 |
| none of the above. |
More Heat Transfer QUESTIONS AND ANSWERS available in next pages
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