Heat Transfer Low thermal conductivity of heat insulating materials is due to its High specific heat Dense structure High proportion of air space None of these High specific heat Dense structure High proportion of air space None of these ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Maximum heat transfer rate is obtained in __________ flow. Creeping Laminar Turbulent Transition region Creeping Laminar Turbulent Transition region 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 Greater than that for uninsulated steam pipe Equal to that of the uninsulated steam pipe Less than the steam pipe with 5 cms insulation Less than that of the uninsulated steam pipe Greater than that for uninsulated steam pipe Equal to that of the uninsulated steam pipe Less than the steam pipe with 5 cms insulation ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is __________ the outlet temperature of the cold fluid. Either more or less than (depending upon the fluid) More than Equal to Less than Either more or less than (depending upon the fluid) More than Equal to Less than ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Graetz number is given by kL/mCp mCp/kL mCp/kμ kμ/mCp kL/mCp mCp/kL mCp/kμ kμ/mCp ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The film thickness for laminar film condensation on vertical surface __________ from top to bottom. Remains constant Cummulatively increases And the surface conductance increase Cummulatively decreases Remains constant Cummulatively increases And the surface conductance increase Cummulatively decreases ANSWER DOWNLOAD EXAMIANS APP
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