Heat Transfer For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone. Low No Extremely low High Low No Extremely low High ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In an extended surface heat exchanger, fluid having lower co-efficient Flows through the tube Can flow either inside or outside the tubes Flows outside the tubes Should not be used as it gives very high pressure drop Flows through the tube Can flow either inside or outside the tubes Flows outside the tubes Should not be used as it gives very high pressure drop ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness) ∝ √t Independent of 't' ∝ 1/t ∝ t ∝ √t Independent of 't' ∝ 1/t ∝ t ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer As per Kirchoffs law, the ratio of the total radiating power to the absorptivity of a body depends on the temperature of the body only nature of material of body wavelength of monochromatic radiation none of the listed here temperature of the body only nature of material of body wavelength of monochromatic radiation none of the listed here 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 555 0.55 0.15 55.5 555 0.55 0.15 55.5 ANSWER DOWNLOAD EXAMIANS APP
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 Plate Sphere All of these Cube Plate Sphere All of these ANSWER DOWNLOAD EXAMIANS APP
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