TOP Machine Design Multiple choice Questions and Answers pdf

21.    Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to
(a)    dynamic loading
(b)    static loading
(c)    combined static and dynamic loading
(d)     completely reversed loading
(e)     all of the above.
Ans: d

22.    Pick up wrong statement. Fatigue strength can be increased by
(a)     cold working
(b)     shot peening
(c)    grinding and lapping surface
(d)    hot working
(e)    using gradual changes of section.
Ans: d

23.    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
(e)     all of the above.
Ans: c

24.    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 overstressing the metal by successively increasing loadings
(e)    none of the above.
Ans: d

25.    Which is correct statement ?
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)    seriousness  would depend on other factors
(e)    none of the above.
Ans: a

26.    The notch angle of the Izod impact test specimen is
(a) 10° 
(b) 20°
(c) 30° 
(d) 45°
(e) 60°.
Ans: d

27.    In Vicker's hardness testing, the pyramid indentor apex is
(a) 40° 
(b) 122°
(c) 136° 
(d) 152°
(e) 161°.
Ans: c

28.    Which is correct statement ?
Stress concentration in cyclic 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)    seriousness would depend on other factors
(e)    none of the above.
Ans: c

29.    In testing a material for endurance strength, it is subjected to
(a)    static load
(b)    dynamic load
(c)    impact load
(d)    static as well as dynamic load
(e)    completely reversed load.
Ans: e

30.    If a material fails below its yield point, failure would be due to
(a) straining 
(b) fatigue
(c) creep 
(d) sudden loading
(e) impact loading.
Ans: b

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