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Q1. Air at 25C, flows over a flat plate maintained at 135Cat a speed of 5m/s. The plate is 3m long and 1.5m wide. Calculate the local heat transfer coefficient at x=0.5m and the heat transferred from the first 0.5m of the plate. [ Answer: hx=0.5=6.14W/m2K; =10139WI Q2. Air at 30C,0.2m/s flows across a 120W spherical electric bulb at 130 C. Find the heat transfer rate and power lost due to convection if bulb diameter is 70mm. %heatlost=10.18%] Q3. Water at 30C,20m/s flows through a straight tube of 60mm diameter. The tube surface is maintained at 70C and outlet temperature of water is 50C. Find the heat transfer coefficient from the tube surface to the water. heat transferred and the tube length. [ Answer: h=43726.59W/m2K; ..... W; L=18.96m ] Q4. Air at 30C,6m/s flows in a rectangular section of size 300800mm. Calculate the heat leakage per meter length per unit temperature difference. (answer (9/T)=39.79W ) Q5. Air at 333K, 1bar pressure, flow through 12cm diameter tube. The surface temperature of the tube is maintained at 400K and mass flow rate is 75kg/hr. Calculate the heat transfer rate for 1.5m length of the tube. [Arswer Q=300.82W ]