Heat Transfer Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be 0.85 0.45 0.35 0.55 0.85 0.45 0.35 0.55 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The thermal radiation emitted by a body is proportional to Tn, where T is its absolute temperature. The value of 'n' is exactly 4 for All bodies A black body Polished bodies only Black painted bodies only All bodies A black body Polished bodies only Black painted bodies only ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is None of these Same as average heat transfer co-efficient for tube side Infinity Zero None of these Same as average heat transfer co-efficient for tube side Infinity Zero 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 Initially decreases and remains constant thereafter Less than 45°C Equal to 45°C More than 45°C Initially decreases and remains constant thereafter Less than 45°C Equal to 45°C More than 45°C ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Unsteady state heat conduction occurs, when 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 Temperature distribution is independent of time ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In case of heat transfer by conduction in a hollow cylinder, __________ mean area is used to calculate the heat transfer rate. Geometric Logarithmic Either A, B or C Arithmetic Geometric Logarithmic Either A, B or C Arithmetic ANSWER DOWNLOAD EXAMIANS APP
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