The document contains 6 questions related to design of components for internal combustion engines including pistons, cylinders, connecting rods, and gear drives. Question 1 involves designing a cast iron piston for a single acting 4-stroke diesel engine. Question 2 involves determining bore, liner thickness, and head thickness for a 4-stroke diesel engine given brake power, speed, and pressure. Question 3 provides additional piston design specifications.
The document contains 6 questions related to design of components for internal combustion engines including pistons, cylinders, connecting rods, and gear drives. Question 1 involves designing a cast iron piston for a single acting 4-stroke diesel engine. Question 2 involves determining bore, liner thickness, and head thickness for a 4-stroke diesel engine given brake power, speed, and pressure. Question 3 provides additional piston design specifications.
The document contains 6 questions related to design of components for internal combustion engines including pistons, cylinders, connecting rods, and gear drives. Question 1 involves designing a cast iron piston for a single acting 4-stroke diesel engine. Question 2 involves determining bore, liner thickness, and head thickness for a 4-stroke diesel engine given brake power, speed, and pressure. Question 3 provides additional piston design specifications.
The document contains 6 questions related to design of components for internal combustion engines including pistons, cylinders, connecting rods, and gear drives. Question 1 involves designing a cast iron piston for a single acting 4-stroke diesel engine. Question 2 involves determining bore, liner thickness, and head thickness for a 4-stroke diesel engine given brake power, speed, and pressure. Question 3 provides additional piston design specifications.
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Assignment test 3 & 4
1) A leather belt 9 mm × 250 mm is used to drive a cast iron pulley 900 mm
in diameter at 336 r.p.m. If the active arc on the smaller pulley is 120° and the stress in tight side is 2 MPa, find the power capacity of the belt. The density of leather may be taken as 980 kg/m3, and the coefficient of friction of leather on cast iron is 0.35. 2) It is required to design a V-Belt drive to connect a 7.5kW, 1440rpm induction motor to a fan, running at approximately 480rpm, for a service of 24hr per day. Space is available for a centre distance of about 1m 3) It is required to design a chain drive to connect a 5 kW, 1400 rpm electric motor to a drilling machine. The speed reduction is 3:1.The centre distance should be approximately 400 mm. (i) Select a proper roller chain for the drive (ii) Determine pitch circle diameters of driving and driven sprockets iii) Determine the number of chain links (iv) Specify the correct centre distance between the axis of sprockets. 4) A double- threaded power screw, with ISO metric trapezoidal threads, is used to raise a load of 300 kN. The nominal diameter is 100 mm and the pitch is 12 mm. The coefficient of friction at screw threads is 0.15.Neglecting collar friction, Calculate: (i) torque required to raise the load (ii) torque required to lower the load and (iii) efficiency of the screw. 5) A pair of worm and worm wheel is designated as 3/60/10/6.The worm is transmitting 5 KW power at 1440 rpm to the worm wheel. The coefficient of friction is 0.1 and the normal pressure angle is 200. Determine the components of the gear tooth force action on the worm and the worm wheel. Assignment 5 1) Design a cast iron piston for a single acting four stroke diesel engine with the following data Cylinder bore = 300mm Length of stroke = 250mm Speed = 600 rpm Brake mean effective pressure = 0.6 MPa Maximum gas pressure = 4MPa Fuel consumption = 0.25 kg per BP per h l/d ratio for bush in small end of connecting rod = 1.5 Assume suitable data if required and state the assumptions made. 2) A four stroke diesel engine has the following specifications Brake power = 5 kW, Speed = 1200 rpm, indicated mean effective pressure = 0.35 N/mm2, Mechanical efficiency = 80%. Determine i) Bore and length of the cylinder ii) Thickness of the liner iii) Thickness of the cylinder head iv) Size, number and pitch of studs. 3) Design a trunk type cast iron piston for a 4-stroke diesel engine with the following specifications: cylinder bore = 250 mm, stroke length = 375 mm, speed = 600 rpm, maximum gas pressure = 5 MPa, indicated mean effective pressure = 0.8 MPa, rate of fuel consumption = 0.3 Kg/BP/H, higher calorific value of fuel = 44 MJ/Kg, mechanical efficiency = 80%. Sate clearly the design decision taken. 4) A connecting rod is to be designed for a high speed, four stroke IC engine. The following data are available. Piston diameter=88mm; Mass of reciprocating parts=1.6kg; Length of the connecting rod (centre to centre)=300mm; Stroke=125mm; RPM=2200 (when developing 50kw); Possible over speed=3000rpm; compression ration = 6.8:1; Probable explosion pressure=3.5MPa. Design and draw fully dimensioned drawing of the connecting rod. 5) The following data is given for the cap and bolts of the big end of the connecting rod. Engine speed=1500rpm length of the connecting rod =320mm length of stroke=140mm mass of reciprocating parts=1.75kg length of crank pin=54mm diameter of the crank pin=38mm permissible tensile stress for the bolts=120MPa permissible bending stress for cap=120MPa Calculate the nominal diameter of the bolts and thickness of the cap for the big end. 6) A cylinder of a four stroke diesel engine has the following specifications: Brake power = 5 kW Speed = 600 rpm Indicated mean effective pressure = 0.5 MPa Make suitable assumptions and calculate a) Bore and length of the cylinder liner b) Thickness of the cylinder liner c) Thickness of the cylinder head.
