DESIGN OF MACHINE ELEMENTS QUESTION BANK

                                                                               UNIT-1

STEADY STRESSES AND VARIABLE STRESSES IN MACHINE MEMBERS PART-A 
 (2 Marks)

1. Define ‘ Design’ and explain the design process

2. What is ‘innovative design”?

3. Explain a method of reducing cost of the final product from the design perspective.

4. What is ‘optimization’? What are the methods for optimization?

5. Define factor of safety. What factor dictate the selection of factor of safety?

6. Differentiate between hardness and toughness of materials.

7. Explain ‘ creep’, resilience’.

8. List the various types of loads and explain.

9. Distinguish between different  types of variable stresses.

10. Explain endurance limit. What factors influence endurance strength?

11. Explain the effect of product reliability on endurance strength.

12. State the significance of S-N curve.

13. Define stress intensity factor, notch sensitivity and fatigue stress concentration factor.

14. Explain Goodman and Seidenberg diagrams

15. Differentiate between the use of Goodman diagram and Seidenberg diagram for designing.

16. Comment on the statement “ In curved beams maximum stress always occurs at the inner  fibre “.

17. What is stress concentration? What are the methods to determine it? What are

the methods to reduce it?

18. Explain how the maximum shear stress theory is used for biaxial and trysail stress cases.

PART-B (16 Marks)

1.     A  bar of circular cross section is subject to alternating tensile forces varying from 200kN to 500kN. Material’s ultimate tensile strength is 900Mpa, endurance limit is 700Mpa. Determine the diameter of the bar using safety factors of 3.5 related to ultimate strength and 4 related to ultimate strength and

4 related to endurance limit. Stress concentration factor us 1.65 use Goodman criteria. (16)

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Design of Machine Elements-Two Marks Question & Answer

UNIT- I

STEADY AND VARIABLE STRESSES

1.  Define Design.

Creating a plan or drawing for a product using intellectual ability and scientific knowledge is called design.  A product so designed should permit economical manufacture, and it should meet the specification requirements.

2.  What are the classifications of machine design?

a)  Adaptive design

b)  Development design

c)  New Design

3.  What are the classifications of machine design based on methods?

a)  Rational design

b)  Empirical design

c)  Industrial Design

d)  Optimum design

e)  System Design

f)   Element design

g)  Computer aided design

4.  What are the general considerations to be considered in designing of a machinecomponent?

1.  Type of load  and stresses caused by the load

2.  Motion of the parts or kinematics of machines

3.  Selection of materials

4.  Form and size of the parts

5.  Frictional resistance and lubrication

6.  Convenient and economical features

7.  Use of standard parts

8.  Safety of operation

9.  Workshop facilities

10.     Number of machines to be manufactures

11.     Cost of construction

12.     Assembling

5.  Write down the general procedure in Machine Design.

a)  Recognition of need

b)  Specifications & Requirements – Design Synthesis

c)  Feasibility Study

d)  Creative Design Synthesis

e)  Preliminary Design and Development

           i.      Analysis of forces

          ii.      Material Selection

f)   Detailed Design of elements

g)  Prototype Building, Testing and Modification

h) Detailed drawing and design for production

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