Design of machine elements question bank

This post covers the important university questions which were already asked in previous Anna university semester examinations April/may 2015, for the subject ME6503 Design of machine elements. Make preparation well with use this as reference.

B.E/ B.Tech Degree Examinations April/May 2015

Anna University, Chennai

Department of Mechanical Engineering

Design of Machine Elements

Regulation 2008/2010

Part B (16 marks)

1.     Design a muff coupling to connect two steel shafts transmitting 25 kW power at 360 rpm. The shafts and keys are made of plain carbon steel 30C8 (S_yt=S_yr=400 N/mm²). The sleeve is made of grey cast iron FG 200 (S_xt = 200 N/mm²). The factor of safety for the shafts and key is 4. For the sleeve, the factor of safety is 6 based on ultimate strength. (AU April/May 2015)

2.         It is required to design a square key for fixing a gear on a shaft of 30mm diameter. The shaft is transmitting 20 kW power at 600 rpm to the gear. The key is made of steel 50C4 (S_yt=460 N/mm²) and the factor of safety is 4. For key material, the yield strength in compression can be assumed to be equal to the yield strength in tension. Determine the dimensions of the key.    (AU April/May 2015)

3.         A rigid coupling is used to transmit 60 kW power at 350 rpm. There are six bolts. The outer diameter of the flanges is 250 mm, while the recess diameter is 175mm. The coefficient of friction between the flanges is 0.15. The bolts are made of steel 45C8 (S_yt=380 N/mm²) and the factor of safety is 3. Determine the diameter of the bolts. Assume that the bolts are fitted in large clearance holes. (AU April/May 2015)

4.         Load on hydrodynamic full journal bearing is 30 kN. The diameter and speed of the shaft are 150 mm and 1200 mm respectively. Diametral clearance 0.2 mm. Sommerfield number is 0.631.L/D ratio 1:1. Calculate temperature rise of oil, quantity of the oil, heat generated and type of oil required. (AU April/May 2015)

5.         Enumerate the detail steps involved in the selection of bearings from the manufacturer’s catalogue. (AU April/May 2015)

6.         A butt welded joint with ground and flush surface is subjected to tensile load which varies from 50 kN to 100 kN. Plates are 10mm thick. Determine the length of weld required for over 2,500,000 cycles. (AU April/May 2015)

7.         Design a helical compression spring to sustain an axial load of 4 kN. The deflection is 80 mm. spring index is 6. The shear stress is not to exceed 350 Mpa. Rigidity modulus for spring material is 81 Gpa. (AU April/May 2015)

8.   Design a leaf spring for the following specifications for a    truck. Assume factor of safety is 2.

            Maximum load on springs = 100 kN

            No of springs   = 4

         Material of spring= Cr Va steel (σ_a = 138 Mpa and 

            E=206 * 10³ Mpa)

            Span of spring = 1000 mm

            Width of central band  = 150 mm

            Permissible deflection = 100 mm

Assume 2 full length leaves and 6 graduated leaves. (AU April/May 2015)

ME6503 Design of Machine Elements Lecture notes

This post covers the handwritten notes (Lecture notes) of Design of Machine Elements unit-2 SHAFTS and COUPLINGS. This will helps to you can get more marks inn examinations.This post consist of 42 pages only.You should prepare well all the topics of unit 2 .

The syllabus of ME6503 Design of Machine Elements and Lecture notes of the Unit 2 Shafts and Couplings also given.

"SEE AFTER SYLLABUS"

ANNA UNIVERSITY  CHENNAI

DEPARTMENT OF MECHANICAL ENGINEERING

REGULATION 2013

ME6503 DESIGN OF MACHINE ELEMENTS 

Click: DME Unit 1 Question Bank

Click : DME Unit 2 Question Bank
Click: DME Unit 3 Question bank
Click: DME Unit 4 Question Bank

Click: DME Unit 5 Question Bank

OBJECTIVES

• To familiarize the various steps involved in the Design Process

• To understand the principles involved in evaluating the shape and dimensions of a component

to satisfy functional and strength requirements.

• To learn to use standard practices and standard data

• To learn to use catalogues and standard machine components

(Use of P S G Design Data Book is permitted)

UNIT I STEADY STRESSES AND VARIABLE STRESSES IN MACHINE MEMBERS 

Introduction to the design process - factors influencing machine design, selection of materials based

on mechanical properties - Preferred numbers, fits and tolerances – Direct, Bending and torsional

stress equations – Impact and shock loading – calculation of principle stresses for various load

combinations, eccentric loading – curved beams – crane hook and ‘C’ frame- Factor of safety -

theories of failure – Design based on strength and stiffness – stress concentration – Design for

variable loading.

UNIT II SHAFTS AND COUPLINGS 

Design of solid and hollow shafts based on strength, rigidity and critical speed – Keys, keyways and

splines - Rigid and flexible couplings.

UNIT III TEMPORARY AND PERMANENT JOINTS 

Threaded fastners - Bolted joints including eccentric loading, Knuckle joints, Cotter joints – Welded

joints, riveted joints for structures - theory of bonded joints.

UNIT IV ENERGY STORING ELEMENTS AND ENGINE COMPONENTS 

Various types of springs, optimization of helical springs - rubber springs - Flywheels considering

stresses in rims and arms for engines and punching machines- Connecting Rods and crank shafts.

UNIT V BEARINGS 

Sliding contact and rolling contact bearings - Hydrodynamic journal bearings, Sommerfeld Number,

Raimondi and Boyd graphs, -- Selection of Rolling Contact bearings.

TOTAL: 45 PERIODS

OUTCOMES:

 Upon completion of this course, the students can able to successfully design machine

components

TEXT BOOK:

1. Bhandari V, “Design of Machine Elements”, 3rd Edition, Tata McGraw-Hill Book Co, 2010.

2. Joseph Shigley, Charles Mischke, Richard Budynas and Keith Nisbett “Mechanical

Engineering Design”, 8th Edition, Tata McGraw-Hill, 2008.

REFERENCES:

1. Sundararajamoorthy T. V. Shanmugam .N, “Machine Design”, Anuradha Publications,

Chennai, 2003.

2. Robert C. Juvinall and Kurt M. Marshek, “Fundamentals of Machine Design”, 4th Edition, Wiley,

2005

3. Alfred Hall, Halowenko, A and Laughlin, H., “Machine Design”, Tata McGraw-Hill

BookCo.(Schaum’s Outline), 2010

4. Bernard Hamrock, Steven Schmid,Bo Jacobson, “Fundamentals of Machine Elements”,2nd

Edition, Tata McGraw-Hill Book Co., 2006.

5. Orthwein W, “Machine Component Design”, Jaico Publishing Co, 2003.

6. Ansel Ugural, “Mechanical Design – An Integral Approach", 1st Edition, Tata McGraw-Hill Book

Co, 2003.

7. Merhyle F. Spotts, Terry E. Shoup and Lee E. Hornberger, “Design of Machine Elements”

8th Edition, Printice Hall, 2003.

Click:DME- Previous 5 years Anna University questions 

Click: DME Unit 1 Question Bank

Click : DME Unit 2 Question Bank
Click: DME Unit 3 Question bank
Click: DME Unit 4 Question Bank
Click: DME Unit 5 Question Bank

Click:DME- Previous 5 years Anna University questions 

I hope the above lecture notes is more useful to understand the unit 2 first half of shafts of Design of Machine Elements subject.Take print out and prepare well for your examinations.

The second half of unit 2 is Coupling which is given in the following link. 

Copy and paste the link

http://annaunivstudymaterials.blogspot.com/2015/12/me6503-design-of-machine-elements-2.html

For more notes visit or go to 

annaunivstudymaterials.blogspot.com