Heat Transfer A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes. 10 Either B or C, depends on the mass of the body >10 10 Either B or C, depends on the mass of the body >10 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer LMTD correction factor which is to be applied for a cross-flow heat exchanger increases with increase in the number of shell passes. Its value for a single pass cross flow heat exchanger is <1 1 Zero >1 <1 1 Zero >1 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Which of the following parameters is increased by use of finned tube in a multipass shell and tube heat exchanger? All of these Effective tube surface area for convective heat transfer Convective heat transfer co-efficient Tube side pressure drop and the heat transfer rate All of these Effective tube surface area for convective heat transfer Convective heat transfer co-efficient Tube side pressure drop and the heat transfer rate ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Dropwise condensation of steam on cooling surface is promoted Only in presence of air An oily surface None of these When both the steam and the tube are clean Only in presence of air An oily surface None of these When both the steam and the tube are clean ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m². The flux, when the element temperature is increased to 1000°C for the same furnace temperature is 11.2 kW/m² 14.6 kW/m² 16.5 kW/m² 12.0 kW/m² 11.2 kW/m² 14.6 kW/m² 16.5 kW/m² 12.0 kW/m² ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Which of the following is the most widely used heat insulating material for pipelines carrying steam? Tar dolomite bricks followed by asbestos 85% magnesia cement and glass wool Fireclay refractory followed by aluminium sheet Cotton followed by aluminium foil Tar dolomite bricks followed by asbestos 85% magnesia cement and glass wool Fireclay refractory followed by aluminium sheet Cotton followed by aluminium foil ANSWER DOWNLOAD EXAMIANS APP
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