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Gearup-JE'19: Machine Design Quiz-2

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Question 1

Consider the following statements:
I. In static loading, stress concentration is more serious in brittle material.
II. In cyclic loading, stress concentration is more serious in ductile material.
III. Stress concentration factor is defined as the ratio of maximum stress to the endurance limit.
Which of the above statements are correct?

Question 2

If the value of Fatigue stress concentration factor (Kf) is one then the value of notch sensitivity is

Question 3

Which of the following statements are true?
1) Fatigue stress concentration factor is the ratio of endurance limit of notch free specimen to the endurance limit of notched specimen.
2) Endurance limit is the maximum completely reversed stress that the material can withstand without fatigue failure for infinite stress cycles.
3) Under completely reversed stress loading, S-N curve (Stress Vs no of stress cycles) of steel becomes asymptote at stress cycles
4) The endurance limit of a machine element can be increased by grinding and lapping of the surface.

Question 4

If a material is subjected to stress S1 in cyclic loading, life of the component is N1 cycles and it is N2 & N3 cycles to the corresponding stresses of S & S3 . If the component is subjected to stress S1 for n1 cycles, stress S2 for n2  cycles and stress S3 for n3 cycles then according to Miner’s rule which of the following statement is true?

Question 5

Which of the following statements are true?
1) The Bauschinger effect states that yield strength of a material reduces with every cycle of stress.
2) Notch sensitivity is a material dependent property.
3) Notch sensitivity lies between zero and one.

Question 6

A machine component is subjected to fluctuating stress that varies from 30 MPa to 110 MPa. The corrected endurance limit stress for the machine component is 300 MPa. The yield strength and ultimate tensile strength of the material is 490 MPa and 700 MPa respectively. The correct equation for factor of safety (f) using Gerber theory is

Question 7

Which of the following statements are true?
1) Most conservative theory of fatigue failure is soderberg’s theory of failure
2) Stress concentration factor depends on geometry, shape, orientation of a body and also on the suddenness of the load acting on the body
3) Gerber’s criterion of fatigue failure follows locus of a straight line
4) Stress concentration factor depends on the type of material

Question 8

Match the List-1 with List-2 and select the correct answer using the codes given below (where n – factor of safety)
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