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Mechanical Engineering Objective Questions { Machine Design }



15. Stress concentration in cyclic loading is more serious in
A.Ductile materials
B.Brittle materials
C.Equally serious in both cases
D.Depends on other factors

16. Pick up wrong statement. Fatigue strength can be increased by
A.Cold working
B.Shot peening
C.Grinding and lapping surface
D.Hot working

17. Which of the following is not correct procedure to increase the fatigue limit
A.Cold working
B.Shot peening
C.Surface decarburisation
D.Under-stressing

18. Coaxing is the procedure of increasing
A.Metal strength by cycling
B.Metal hardness by surface treatment
C.Metal resistance to corrosion by coating
D.Fatigue limit by over stressing the metal by successively increasing loading

19. Which is correct statement about Stress concentration in static loading is
A.Very serious in brittle materials and less serious in ductile materials
B.Very serious in ductile materials and less serious in brittle materials
C.Equally serious in both types of materials
D.None of the above

20. The notch angle of the Izod impact test specimen is
A.10
B.20
C.30
D.45

21. In Vicker's hardness testing, the pyramid indentor apex is
A.40
B.122
C.136
D.152

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