Heat Transfer If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows __________ law. Linear Logarithmic Hyperbolic Parabolic Linear Logarithmic Hyperbolic Parabolic ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A cube, sphere & a thin circular plate (all having same mass and made of same material) are all heated to 300°C and allowed to cool in natural air. Which one will cool the slowest ? Sphere Cube Plate All of these Sphere Cube Plate All of these ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is None of these Hyperbolic Linear Parabolic None of these Hyperbolic Linear Parabolic ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A steel sphere of radius 0.1 m at 400°K is immersed in an oil at 300°K. If the centre of the sphere reaches 350°K in 20 minutes, how long will it take for a 0.05 m radius steel sphere to reach the same temperature (at the centre) under identical conditions ? Assume that the conductive heat transfer co-efficient is infinitely large. 40 minutes 10 minutes 5 minutes 20 minutes 40 minutes 10 minutes 5 minutes 20 minutes ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Heat exchangers operating, when the asymptotic range is reached, Results in abruptly increased velocity Results in making part of the heating surface inactive Provide very large heat transfer co-efficient None of these Results in abruptly increased velocity Results in making part of the heating surface inactive Provide very large heat transfer co-efficient None of these ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Unsteady state heat conduction occurs, when Temperature distribution is independent of time Three dimensional heat flow is concerned Temperature distribution is dependent on time Heat flows in one direction only Temperature distribution is independent of time Three dimensional heat flow is concerned Temperature distribution is dependent on time Heat flows in one direction only ANSWER DOWNLOAD EXAMIANS APP
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