Realtime Machine Design Multiple choice Questions and Answers pdf

31.    The fatigue limit of a material
(a)    is greatly decreased by poor surface conditions
(b)    remains same irrespective of surface conditions
(c)    depends mainly on core composition
(d)    is dependent upon yield strength of material
(e)    none of the above.
Ans: a

32.    Cold working
(a)    increases the fatigue strength
(b)    decreases the fatigue strength
(c)    has no influence on fatigue strength
(d)    alone has  no  influence  on  fatigue strength
(e)    none of the above.
Ans: a

33.    Yield point in fatigue loading as compared to static loading is
(a)    same
(b)    higher
(c)    lower
(d)     depends on other factors
(e)     none of the above.
Ans: c

34.    Residual stress in materials
(a)    acts when external load is applied
(b)    becomes zero when external load is removed
(c)    is independent of external loads
(d)    is always harmful
(e)    is always beneficial.
 Ans: c

35.    The building up of worn and uridersized parts, subjected to repeated loads by electroplating is
(a)    best method
(b)    extremely hazardous
(c)    has no effect as regards fatigue strength
(d)    cheapest method
(e)    all of the above.
Ans: a

36.    In nitrided parts, the origins of the fatigue cracks will occur at
(a)    surface
(b)    just below the surface
(c)    within the core
(d)    could occur anywhere
(e)    none of the above.
Ans: e

37.    Which process will increase the fatigue duration of parts ?
(a)    finishing and polishing
(b)    shot-peening
(c)    decarburisation
(d)    electroplating
(e)    all of the above".
Ans: b

38.    Which is correct statement ?
(a)    a member made of steel will generally be more rigid than a member of equal load-carrying ability made of cast iron
(b)    a member made of cast iron will generally be. more rigid than a member of equal load carrying ability made of steel
(c)    both will be equally rigid
(d)    which one is rigid will depend on several other factors
(e)    none of the above.
Ans: b

39.    Resistance to fatigue of a material is measured by
(a)    Young's modulus
(b)    coefficient of elasticity
(c)    elastic limit
(d)    ultimate tensile strength
(e)     endurance limit.
Ans: e

40.    In most machine members, the damping capacity of the material should be
(a)    low
(b)    zero
(c)    high
(d)    could be anything
(e)    none of the above.
 Ans: c

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