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Question 3: (40 points) Specific fuel consumption rate table is given for an engine Power and Torque curves for the engines also given. Please answer the following questions: a) (10 pts) Find the SFC. power and torque when it runs at the engine rpm of minimum specific Fuel consumption rate b) (10 pts) Find the torque and specific fuel consumption rate when it runs at the engine rpm of SOKW power. c) (10 pts) Find the power and specific fuel consumption rate when it runs at the engine rpm af 280Nm torque d) (10 pts) Calculate the fuel tank volume needed if the vehicle has the range for 3 hours of driving at 280 Nm torque and 4 hours of driving at 4000 rpm. The fuel density is 830 kg/ml SFC curves and tabulated values for Engines Engine rpm SEC [kg/kW-hr] 1500 0.380 2000 0.360 2500 0.325 3000 0.315 3500 0.290 4000 0.280 4500 0.270 5000 0.265 5500 0.260 6000 0.266 6500 0.272 7000 0.275 7500 0.276 Power and Torque Curves
7500 0.276 Power and Torque Curves 480 240 440 220 Torque (Nm) 400 200 360 180 320 160 280 140 240 120 200 100 160 120 60 Power Output (kW) 80 ) 40 Torque (Nm) Power Output (kW) 0 1.000 2.000 3.000 4.000 5.000 6.000 7.000 Rev (rpm)