Engineering - Mechanical Engineering
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55. | Total heat is the heat required to |
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56. | Two balls of same material and finish have their diameters in the ratio of 2 : 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of |
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57. | Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by |
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58. | Unit of thermal diffusivity is |
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59. | When heat is Transferred by molecular collision, it is referred to as heat transfer by |
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60. | Which of the following is the case of heat transfer by radiation |
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