Design Against Fluctuating Load Practice Set

11. The endurance limit of the component can be increased by

Shot peening

Increasing the stress concentration

Increasing the size of component

Coating

12. The notch sensitivity factor (q) is given by

Where, K_t and K_fare theoretical and fatigue stress concentration factors

q = Kf + 1/Kt +1

q = Kt -1/Kf - 1

q = Kt +1/Kf + 1

q = Kf - 1/Kt -1

13. In cyclic loading, the effect of stress concentration is more serious in case of

Components made of brittle as well as ductile materials

Components made of brittle materials

None of these

Components made of ductile materials

14. As the size of the component increases, the endurance limit of the component

Remains same

Increases

Decreases

Increases up to the diameter of 50 mm and then decreases

15. Stress concentration occurs at the contact between

Any one of these

Meshing teeth of driving and driven gears

Cam and follower

Balls and races in ball bearing

16. A stress that varies in sinusoidal manner with respect to time from tensile to compressive (or vice versa) and which zero mean is called

Reversed stress

Repeated stress

Fluctuating stress

Varying stress

17. In static loading, the effect of stress concentration is more serious in case of

None of the above

Components made of brittle as well as ductile materials

Components made of brittle materials

Components made of ductile materials

18. The approximate relationship between endurance limit of rotating beam specimen (S’_e) and ultimate tensile strength (S_ut) in case of cast iron and cast steel components, is

S’e = 0.577 Sut

S’e = 0.75 Sut

S’e = 0.5 Sut

S’e = 0.4 Sut

19. A stress that varies in sinusoidal manner with respect to time from a minimum value to maximum value and which has some mean as well as amplitude value is called

Varying stress

Repeated stress

Fluctuating stress

Reversed stress

20. Stress concentration factor is defined as

Ratio of endurance limit to highest stress near the

Ratio of highest stress near the discontinuity to nominal stress obtained by elementary equation

Ratio of highest stress near the discontinuity to endurance limit

Ratio of highest stress near the discontinuity to yield strength

Design Against Fluctuating Load Practice Set

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