APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
SECOND SEMESTER M.TECH DEGREE EXAMINATION, APRIL 2017
Mechanical Engineering (Internal Combustion Engines and Turbo-machinery)
07ME 6104 INTERNAL COMBUSTION ENGINE DESIGN
Max.Marks :60 Approved Design Data Books are permitted. Time: 3 hours
Answer all questions. of each question is compulsory. Answer either or
Q.No Module 1 Marks
1a. Give the criteria for selection of design materials for IC cylinders. What are the common
materials used for cylinders? 4
Answer or
1b. Give the steps, an engineer has to recommend for weld in design for manufacturing. 5
1c. Explain briefly the causes of vibration in IC engines and steps for minimizing. 5
Q.No Module 2 Marks
2a. Give an account of the developments in IC engine cylinder head design. 4
Answer or
2b. Derive the expressions for the forces acting on the rocker arm of valve gear mechanism of
horizontal IC engines, from exhaust valve. 5
2c. Derive an expression for inertia torque exerted on crankshaft of an IC engine. 5
Q. No. Module 3 Marks
3a. Design a spring for the exhaust valve of a four stroke IC engine. Data given follows:- valvehead
diameter 80 mm, valve lift 30 mm, maximum suction pressure 0.02 MPa below
atmosphere, spring stiffness 10 design shear stress for spring material 300 N/mm2,
spring index modulus of rigidity 84×103 N/mm2, total gap between coils may be taken as
15% of maximum compression. 4
Answer or
3b. Design a cast iron piston for a single cylinder four stroke engine using the following data.
Cylinder bore =120 mm, stroke =150 mm, maximum gas pressure 3.25 MPa, brake mean
effective pressure 0.6 MPa, fuel consumption 0.16 kg/brake power in kW/h and speed 2100
rpm. Additional data used should be clearly stated. Mark the dimensions on a neat sketch. 5
3c. An exhaust valve for a horizontal diesel engine is to be designed. Cylinder bore 140 mm,
stroke length 250 mm, engine speed 600 rpm, maximum gas pressure 3.4 MPa, seat angle
45o. Determine diameter of valve port, diameter of valve head, thickness of valve head,
diameter of valve stem, and maximum lift of the valve. 5
Q.No. Module 4 Marks
4a. A rimmed fly wheel of grey cast iron is to be designed. Mean radius of rim 1.6 thickness
of rim 200 mm, width of rim 250 mm, number of spokes cross sectional area of each
spoke 10500 mm2, speed of rotation 800 rpm, and mass density of cast iron 7100 kg/m3.
Determine axial stress in spoke, tensile stress in the rim at angle 0 and 30o, where
is measured from bi-sector of angle between two spokes. 4
Answer or
4b.With the help of a neat sketch, explain the working of basic computer controlled fuel
Injection system. 5
4c. Explain briefly, the developments in ignition system of SI engine. 5
Q. No Module 5 Marks
5a. Sketch the scavenging diagram for a two-stroke SI engine and explain the terms,
delivery ratio and trapping efficiency. 5
Answer or
5b. Explain briefly, three methods of scavenging in two stroke engines. Make a comparison. 7
5c.Explain"time integral of area per unit swept volume" in two-stroke engine. 7
Q. No Module 6 Marks
6a. Explain how EGR system reduces exhaust emission. 5
Answer or
6b. How does catalytic converter reduce exhaust emission? Sketch the variation of its efficiency
with temperature. 7
6cWhat are the basic types of pollution control devices'? Explain briefly. 7