Q1. (a) Discuss the factors that have to be considered in the design of an engine cylinder. (b) The pressure, volume and temperature at the beginning of compression of a four stroke petrol engine are 105kN/m²,0.0005m³ and 25°C respectively. The maximum temperature of the cycle is 1400°C. The volume ratio of the engine is 8:1. i) Calculate the mean effective pressure in the cylinder. ii) The brake power produced by the engine is 60kW at a speed of 5200 r.p.m. If the Mechanical efficiency of the engine is 82%, determine the size of the cylinder bore and length. iii) Estimate the thickness of the cylinder head to support the gas load present in the engine cylinder. Assume the material has a tensile stress of 42N/mm². (c) Discuss the nature of the stresses present in the cylinder walls.

Part (a)  Find the efficiency of an ideal engine operating between these reservoirs. Remember the efficiency is unit-less, therefore so should your number be as well. ( Party a was incorrect can you try again )  Part (d)  What if the actual work done (more realistically) is W = 290 J during a single cycle; what is the efficiency of this engine if the energy input is the same (again, the number should be unit-less)?  Part (e)  What is equation for the new power output per cycle (in Watts) of this new (and more realistic) engine?

Need answer please. Carefull solution to solve for the correct answer thank you.

2. A four-cycle, 5.866 L engine consumes 19 kg/hr of fuel and 413 kg/hr of air while running under full load at 2,400 rev/min. The air temperature is 24.2°C,and the barometric pressure is 98.13 KPa. Calculate (a.) the air density, (b.) the theoretical air consumption rate, , and (c.) the volumetric efficiency