Mechanical Engineering : Heat Transfer QUESTIONS AND ANSWERS :: part2 : 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.The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as |
| emissivity |
| transmissive |
| reflectivity |
| intensity of radiation |
| absorptivity. |
7.Which of the following has least value of conductivity |
| glass |
| water |
| plastic |
| rubber |
| air. |
8.Which of the following has maximum value of thermal conductivity |
| aluminium |
| steel |
| brass |
| copper |
| lead. |
9.According to Prevost theory of heat exchange |
| it is impossible to transfer heat from low temperature source to t high temperature source |
| heat transfer by radiation requires no medium |
| all bodies above absolute zero emit radiation |
| heat transfer in most of the cases takes place by combination of conduction, convection and radiation |
| rate of heat transfer depends on thermal conductivity and temperature difference. |
10.A non-dimensional number generally associated with natural convection heat transfer is |
| Grashoff number |
| Nusselt number |
| Weber number |
| Prandtl number |
| Reynold number. |
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