Heat Transfer Heat exchangers operating, when the asymptotic range is reached, 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 Results in abruptly increased velocity ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m².°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be Less than that of the uninsulated steam pipe Equal to that of the uninsulated steam pipe Less than the steam pipe with 5 cms insulation Greater than that for uninsulated steam pipe Less than that of the uninsulated steam pipe Equal to that of the uninsulated steam pipe Less than the steam pipe with 5 cms insulation Greater than that for uninsulated steam pipe ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Dropwise condensation occurs on __________ surfaces polished clean and dirt free contaminated cooling smooth clean polished clean and dirt free contaminated cooling smooth clean ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer For small temperature difference, the heat transfer rate as per Newton's law of cooling is proportional to (where, Δt = excess temperature) Δt² √Δt Δt³ Δt Δt² √Δt Δt³ Δt ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Maximum heat transfer rate is achieved in __________ flow. Turbulent Counter-current Laminar Co-current Turbulent Counter-current Laminar Co-current ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In a single effect evaporator, the economy is > 1 None of these 1 < 1 > 1 None of these 1 < 1 ANSWER DOWNLOAD EXAMIANS APP
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