Which of the following is not a characteristic observed in material failure by fatigue fracture ?

A Plastic deformation of material does not occur
B Initiation of crack from below the surface does not occur
C Initation of crack occurs on the surface of the machine part
D Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface

Correct Answer: Initiation of crack from below the surface does not occur

Bissoy MCQ
#Chemical Engineering #Chemical Engineering Basics

Related Questions

Failure of a material is termed as fatigue failure, if it fails below the yield point. The resistance to fatigue failure of a material is measured by the
A Ultimate tensile strength (U.T.S.)
B Endurance limit
C Elastic limit
D None of these
Fatigue limit improvement by over stressing the metal by successively increasing the load is called coaxing. In fatigue failure, the material fails
A Below the yield point
B Above the yield point
C Below the elastic limit
D At the elastic limit
A tensile test is performed on a round bar. After fracture, it has been found that the diameter remains approximately same at fracture. The material under test was
A Mild steel
B Cast iron
C Glass
D Copper
The yield point in fatigue loading compared to that in static loading is less. The ratio of ultimate tensile strength to endurance limit of a material subjected to fatigue loading is
A 0.5
B 1
C 1.5
D 2
Failure of a material is called fatigue when it fails
A At the elastic limit
B Below the elastic limit
C At the yield point
D Below the yield point
Fatigue failure of a material results from __________ stress.
A Tensile
B Compressive
C Fluctuating
D None of these
Fatigue failure of a material may occur, when it is subjected to __________ stress.
A Fluctuating
B Tensile
C Compressive
D Torsion
Endurance is a measure of fatigue limit of a metal. Fatigue crack in nitrided machine parts originates
A At the surface
B Within the core
C Just below the surface
D Anywhere on the surface
The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as
A Rigid
B Tough
C Ductile
D Plastic
The endurance or fatigue limit is defined as the maximum value of the stress which a polished standard specimen can withstand without failure, for infinite number of cycles, when subjected to
A Static load
B Dynamic load
C Static as well as dynamic load
D Completely reversed load

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