15AT53T: Design of Machine Elements Auto 5th Sem Syllabus for Diploma DTE Karnataka C15 Scheme

Design of Machine Elements detail DTE Kar Diploma syllabus for Automobile Engineering (AT), C15 scheme is extracted from DTE Karnataka official website and presented for diploma students. The course code (15AT53T), and for exam duration, Teaching Hr/week, Practical Hr/week, Total Marks, internal marks, theory marks, duration and credits do visit complete sem subjects post given below. The syllabus PDFs can be downloaded from official website.

For all other auto 5th sem syllabus for diploma c15 scheme dte karnataka you can visit Auto 5th Sem Syllabus for Diploma C15 Scheme DTE Karnataka Subjects. The detail syllabus for design of machine elements is as follows.

Pre-requisites:

Knowledge of Mathematics, Engineering Mechanics, Strength of Materials, Theory of Machines, Machine drawing and Workshop Processes.

Course Objectives:

This course curriculum provides the knowledge of design process, as well as enables the student to design simple machine components used in small and medium scale industries.

Course Outcomes:

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UNIT I: INTRODUCTION TO DESIGN 02Hrs

Machine Design-Definition, Classification, General procedure and considerations.

UNIT II: DESIGN OF FASTENERS 12Hrs

Screw thread terminology, Common types of screw fastenings-Through bolts-Tap bolts-Studs-Cap screws-Set screws, forms of screw threads-V Threads-square threads- whitworth threadsellers thread-unified standard thread-square thread-acme thread-knuckle thread-buttress thread, locking devices-Lock nut-Slotted nut-Castle nut-grooved nut-Locking by a lock platetab washer-spring washer, Designation of screw thread, stresses in screw fastening due to external loading- Tensile-compressive-combined tensile & shear stress, bolts of Uniform Strength, simple problems on design of bolts subjected to external force -Design of Riveted joints -classification- Important terms used in riveted joints-materials for rivets- Failures of riveted joints-Strength and efficiency of riveted joints-Simple problems on Single and Double riveted lap joint -Single and Double riveted Butt joint (with single and double strap)

UNIT III: DESIGN OF SHAFTS, KEYS 10Hrs

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UNIT IV: DESIGN OF SIMPLE MACHINE PARTS 14Hrs

Couplings-purpose-requirements-Types ,Design of Couplings – Solid Muff Coupling- Flange coupling (Protected and Unprotected type) -simple problems, Design of socket and spigot cotter joint-simple problem, Knuckle Joint-purpose-methods of failure-simple problems.

UNIT V: DESIGN OF ENGINE PARTS 08Hrs

Design of Engine cylinder (Thickness of cylinder wall, head thickness, bore & length of cylinder, size of studs)-simple problems, Design of piston, piston pin & piston rings-simple problems.

UNIT VI: DESIGN OF SPRINGS 06Hrs

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Reference Books:

1. A Text book of Machine Design R.S. Khurmi & J.K.Gupta S. Chand publication
2. Machine design S G Kulkarni McGraw Hill Education
3. Introduction to Machine design V B Bhandari McGraw Hill Education
4. Automotive Mechanics Dr N K Giri Khanna Publishers
5. Design Of Machine Elements Vol I, Vol II J.B.K. Das , P.L. Srinivas Murthy Sapna Publication
6. Auto Design R B Gupta Satya Prakashan
7. Design Data Hand Book for Mechanical Engineers K Mahadevan & K Balaveera Reddy CBS publications

LIST SOFTWARES/WEBSITES

1. http://nptel.ac.in/courses/Webcourse-contents/nT%20Kharagpur/Machine%20design1/left_home.html
2. http://nptel.ac.in/courses/Webcourse-contents/IIT%20Kharagpur/Machine%20design1/left_mod4.html
3. http://nptel.ac.in/courses/Webcourse-contents/IIT%20Kharagpur/Machine%20design 1/l eft mod7. html .
4. http://nptel.ac.in/courses/Webcourse-contents/IIT%20Kharagpur/Machine%20design1/left_mod4.html
5. http://nptel.ac.in/courses/Webcourse-contents/IIT%20Kharagpur/Machine%20design1/left mod5. html
6. http://nptel.ac.in/courses/Webcourse-contents/nT’/o20Kharagpur/Machine%20design1/left mod8. html

Suggested List of Student Activities:

Note: the following activities or similar activities for assessing CIE (IA) for 5 marks (Any one) Each student should do any one of the following type activity or similar activity related to the course and before take up, get it approved from concerned Teacher and HOD.

Each student should conduct different activity and no repeating should occur.

1. The students should identify at least five machine components .He should select the materials for identified machine components by using design data hand book. List the mechanical properties of material selected.
2. Observe the mechanisms where transmission of power takes place through shaft, Keys, coupling, pulley and belt drive. Get the required information regarding power transmitted (power output by motor engine etc)
3. The students can visit nearby workshops/garages and collect information like material, design features etc on different fasteners and machine components.
4. Assignments on design of Screwed joints, Riveted joints [one each] With free hand sketches.
5. The student should Download and present various presentations related to design of machine elements.
6. The student should Download and present various presentations related to stresses in Machine elements.
7. The student should Download and present various presentations related to failure of Machine elements.

Model Question Paper:

(CIE)

1. Explain any five considerations in Machine Design
2. Explain Whitworth thread with its profile

OR

3. Define Machine Design.
4. Define efficiency of riveted joint
2. An engine cylinder is 300 mm in diameter and the steam pressure is ‘7. N/mm2. If the cylinder head is held by 12 studs, find the size. Assume safe tensile stress as 28 MPa.

OR An eye bolt is to be used for lifting a load of 60 kN. Find the nominal diameter of the bolt, if the tensile stress is not to exceed 100 MPa. Assume coarse threads.

Model Question Paper:

(SEE)

NOTE:

1. Use of Design data hand book is permitted
2. Answer any six questions from PART-A and each question carry five marks.
3. Answer any seven questions from PART-B and each question carry ten marks.

PART-A

1. List out the classification of Machine Design.
2. Explain woodruff key with sketch
3. Explain Whitworth thread with its profile.
4. An eye bolt is to be used for lifting a load of 60 kN. Find the nominal diameter of the bolt, if the tensile stress is not to exceed 100 MPa. Assume coarse threads.
5. Explain sunk key with sketch.
6. Design the rectangular key for a shaft of 50 mm diameter. The shearing and crushing stresses for the key material are 42 MPa and 70 MPa.
7. Classify the fasteners.
8. Define the following terms used in coil spring.
1. solid length
2. Free length
3. Spring index
9. Explain castle nut with a sketch

PART-B

1. An electric motor weighing 10KN is lifted by means of an eye bolt. The eye bolt is screwed into the frame of the motor. The eye bolt has coarse threads. It is made of plain carbon steel having ultimate tensile stress of 400N/mm2 and factor of safety is 6 . Determine the size of the bolt.
2. A double riveted double cover butt joint is made in 12 mm thick plates with 18 mm diameter rivets. Find the efficiency of the joint for a pitch of 80 mm, if allowable tensile stress in the plate 115 MPa ; compressive stress 160 MPa; and shear stress in the rivet 80 MPa.
3. A solid shaft is transmitting 1 MW at 240rpm determine the diameter of the shaft if the maximum torque transmitted exceeds the mean torque by 20%. Take the maximum allowable shear stress as 60MPa. 4
4. Design a cast iron flange coupling for a mild steel shaft transmitting 90 kW at 250 rpm. The allowable shear stress in the shaft is 40 MPa and the angle of twist is not to exceed 1′ in a length of 20 diameters. The allowable shear stress in the coupling bolts is 30 MPa.
5. Design a muff coupling to connect two shafts transmitting 40 kW at 120 r.p.m. The permissible shear and crushing stress for the shaft and key material (mild steel) are 30 MPa and 80 MPa respectively. The material of muff is cast iron with permissible shear stress of 15MPa. Assume that the maximum torque transmitted is 25 per cent greater than the mean torque.
6. Design a knuckle joint to transmit 150 kN. The design stresses may be taken as 75 MPa in tension, 60 MPa in shear and 150 MPa in compression.
7. Design a cotter joint to connect two mild steel rods for a pull of 30 kN. The maximum permissible stresses are 55 MPa in tension; 40 MPa in shear and 70 MPa in crushing. Draw a neat sketch of the joint designed.
8. Design an aluminum alloy piston with a flat head for an I C engine having 100mm bore. The maximum explosion pressure is ‘5. N/mm2. Given that

Permissible stress for aluminum alloy piston= 70 N/mm2 Permissible stress for piston ring= 100 N/mm2 Cylinder wall pressure = ‘0.4 N/mm2 Permissible bearing pressure on piston barrel= ‘4.5 N/mm2 Permissible bearing pressure for piston pin= 70 N/mm2

9. A four stroke internal combustion engine has the following specifications. Brake power=5KW, Speed=1200 rpm, Mean effective pressure=’3.5N/mm2 Mechanical efficiency=80%, Maximum gas pressure=’1.5 N/mm2, Determine Bore and length of the cylinder, ifstroke length is ‘5. times cylinder bore. Thickness of the cylinder head if permissible stress for head material is 42N/mm2 Size of studs for the cylinder head, if permissible stress for stud material is 65N/mm2.
10. Design a helical compression spring for a maximum load of1000 N for a deflection of 25 mm using the value of spring index as
11. The maximum permissible shear stress for spring wire is 420 MPa and modulus of rigidity is 84 kN/mm2,with considering whal’s factor.

For detail syllabus of all other subjects of BE Auto, C15 scheme do visit Auto 5th Sem syllabus for C15 scheme.

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