Heat Transfer A cube, sphere & a thin circular plate (all having same mass and made of same material) are all heated to 300°C and allowed to cool in natural air. Which one will cool the slowest ? Cube All of these Sphere Plate Cube All of these Sphere Plate ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Fouling factor None of these Is a dimensionless quantity Does not provide a safety factor for design Accounts for additional resistances to heat flow None of these Is a dimensionless quantity Does not provide a safety factor for design Accounts for additional resistances to heat flow ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In counter flow compared to parallel flow, Less surface area is required for a given heat transfer rate LMTD is greater Both A and B More surface area is required for a given heat transfer rate Less surface area is required for a given heat transfer rate LMTD is greater Both A and B More surface area is required for a given heat transfer rate ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A metal ball of radius 0.1 m at a uniform temperature of 90°C is left in air at 30°C. The density and the specific heat of the metal are 3000 kg/m³ and 0.4 kJ/kg.K respectively. The heat transfer co-efficient is 50 W/m².K Neglecting the temperature gradients inside the ball, the time taken (in hours) for the ball to cool to 60°C is 55.5 0.15 555 0.55 55.5 0.15 555 0.55 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Boiling point elevation of an ideal solution Decreases rapidly with temperature rise Increases rapidly with temperature rise In independent of pressure Both B and C Decreases rapidly with temperature rise Increases rapidly with temperature rise In independent of pressure Both B and C ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The actual temperature drop across the heating surface of an evaporator depends on the Pressure difference between the steam chest and the vapor space above the boiling liquid All of these Solution being evaporated Liquid depth over the heating surface Pressure difference between the steam chest and the vapor space above the boiling liquid All of these Solution being evaporated Liquid depth over the heating surface ANSWER DOWNLOAD EXAMIANS APP
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