Heat Transfer Dropwise condensation of steam on cooling surface is promoted Only in presence of air None of these When both the steam and the tube are clean An oily surface Only in presence of air None of these When both the steam and the tube are clean An oily surface ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Multipass heat exchangers are used To reduce the pressure drop To obtain higher heat transfer co-efficient and shorter tube For low heat load Because of simplicity of fabrication To reduce the pressure drop To obtain higher heat transfer co-efficient and shorter tube For low heat load Because of simplicity of fabrication ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Vibrations in the tubes of a shell and tube heat exchanger is induced due to the Oscillations in the flow of shell/tube sides fluid Vibrations transmitted through piping and/or supports due to external reasons Flow of fluid on the tube and shell sides All of these Oscillations in the flow of shell/tube sides fluid Vibrations transmitted through piping and/or supports due to external reasons Flow of fluid on the tube and shell sides All of these ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A tank painted with which of the following coloured paints, would heat up maximum by radiation from sun? White paint Black paint Yellow paint Grey paint White paint Black paint Yellow paint Grey paint ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Boiling point elevation of a solution of NaOH Both B and C Is almost independent of pressure Increases rapidly with temperature rise Is almost independent of temperature Both B and C Is almost independent of pressure Increases rapidly with temperature rise Is almost independent of temperature ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be Less than 45°C More than 45°C Equal to 45°C Initially decreases and remains constant thereafter Less than 45°C More than 45°C Equal to 45°C Initially decreases and remains constant thereafter ANSWER DOWNLOAD EXAMIANS APP
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