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- Question : HW1 - Compute the mean piston speed, bmep (bar), torque (Nm), and the power per piston area for the engines listed in Table 1.2
- Question : HW2 - A six-cylinder two-stroke engine with a compression ratio ?? = 9 produces a torque of 1100 Nm at a speed of 2100 rpm. It has a bore ?? of 123 mm and a stroke ?? of 127 mm. (a) What is the displacement volume and the clearance volume of a cylinder? (b) What is the engine bmep, brake power, and mean piston speed?
- Question : HW3 - A four-cylinder 2.5 L spark-ignited engine is mounted on a dyno and operated at a speed of ?? = 3000 rpm. The engine has a compression ratio of 10:1 and mass air--fuel ratio of 15:1. The inlet air manifold conditions are 80 kPa and 313 K. The engine produces a torque of 160 Nm and has a volumetric efficiency of 0.82. (a) What is the brake power ? ?? ?? (kW)? (b) What is the brake specific fuel consumption bsfc (g/kWh)?
- Question : HW4 - The volumetric efficiency of the fuel injected marine engine in Table 1.2 is 0.80 and the inlet manifold density is 50% greater than the standard atmospheric density of ???????? = 1.17 kg/m3. If the engine speed is 2600 rpm, what is the air mass flow rate (kg/s)?
- Question : HW5 - A 380 cc single-cylinder two-stroke motorcycle engine is operating at 5500 rpm. The engine has a bore of 82 mm and a stroke of 72 mm. Performance testing gives a bmep = 6.81 bar, bsfc = 0.49 kg/kWh, and delivery ratio of 0.748. (a) What is the fuel to air ratio? (b) What is the air mass flow rate (kg/s)?
- Question : HW6 - A 3.8 L four-stroke four-cylinder fuel-injected automobile engine has a power output of 88 kW at 4000 rpm and volumetric efficiency of 0.85. The bsfc is 0.35 kg/kW h. If the fuel has a heat of combustion of 42 MJ/kg, what are the bmep, thermal efficiency, and air to fuel ratio? Assume atmospheric conditions of 298 K and 1 bar.
- Question : HW7 - A 4.0 L six-cylinder engine is operating at 3000 rpm. The engine has a compression ratio of 10:1, and volumetric efficiency of 0.85. If the bore and stroke are equal, what is the stroke, the mean piston speed, cylinder clearance volume, and air mass flow rate into the engine? Assume standard inlet conditions.
- Question : HW8 - Chose an automotive, marine, or aviation engine of interest, and compute the engine
- Question : HW9 - Compare the approximate, Equation 1.29, and exact, Equation 1.26, dimensionless cylinder volume versus crank angle profiles for ?? = 8, ?? = 100 mm, and ?? = 150 mm. What is the maximum error and at what crank angle does it occur?
- Question : HW10 - Plot the dimensionless piston velocity for an engine with a stroke ?? = 100 mm and connecting rod length ?? = 150 mm.
- Question : HW11 - Assuming that the mean effective pressure, mean piston speed, power per unit piston area, and mass per unit displacement volume are all size independent, how will the power per unit weight of an engine depend upon the number of cylinders if the total displacement is constant? To make the analysis easier, assume that the bore and stroke are equal.

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