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

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
by

1 Answer

Answer :

(d) below the yield point
by

Related questions

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

Description : 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

Last Answer : Option A

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

Description : 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

Last Answer : (B) Endurance limit

Factor of safety for fatigue loading is the ratio of (a) elastic limit to the working stress (b) Young's modulus to the ultimate tensile strength (c) endurance limit to the working stress (d) elastic limit to the yield point

Description : Factor of safety for fatigue loading is the ratio of (a) elastic limit to the working stress (b) Young's modulus to the ultimate tensile strength (c) endurance limit to the working stress (d) elastic limit to the yield point

Last Answer : (c) endurance limit to the working stress

The resistance to fatigue of a material is measured by (a) elastic limit (b) Young's modulus (c) ultimate tensile strength (d) endurance limit

Description : The resistance to fatigue of a material is measured by (a) elastic limit (b) Young's modulus (c) ultimate tensile strength (d) endurance limit

Last Answer : (d) endurance limit

In a ductile material, the strength are (a)Firstly Ultimate >yield > elastic limit (b) Secondly Ultimate > yield =elastic limit (c) Thirdly Ultimate=yield=elastic limit (d) None

Description : In a ductile material, the strength are (a)Firstly Ultimate >yield > elastic limit (b) Secondly Ultimate > yield =elastic limit (c) Thirdly Ultimate=yield=elastic limit (d) None

Last Answer : (a)Firstly Ultimate >yield > elastic limit

In a brittle material, the strength are (a) Firstly Ultimate >yield > elastic limit (b) Secondly Ultimate > yield =elastic limit (c) Thirdly Ultimate=yield=elastic limit (d) None

Description : In a brittle material, the strength are (a) Firstly Ultimate >yield > elastic limit (b) Secondly Ultimate > yield =elastic limit (c) Thirdly Ultimate=yield=elastic limit (d) None

Last Answer : (c) Thirdly Ultimate=yield=elastic limit

For a homogeneous & isotropic body under hydrostatic pressure, which theory of elastic failure fails (a) Firstly Maximum Principal Theory (b) Secondly Maximum Principal strain Theory (c) Thirdly Maximum Principal Energy Theory (d) None

Description : For a homogeneous & isotropic body under hydrostatic pressure, which theory of elastic failure fails (a) Firstly Maximum Principal Theory (b) Secondly Maximum Principal strain Theory (c) Thirdly Maximum Principal Energy Theory (d) None

Last Answer : (c) Thirdly Maximum Principal Energy Theory

What will happen if stresses induced due to surge in the spring exceeds the endurance limit stress of the spring. a) Fatigue Failure b) Fracture c) None of the listed d) Nipping

Description : What will happen if stresses induced due to surge in the spring exceeds the endurance limit stress of the spring. a) Fatigue Failure b) Fracture c) None of the listed d) Nipping

Last Answer : a) Fatigue Failure

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

Description : 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

Last Answer : (d) completely reversed load

Theories of elastic failure while dealing with brittle materials consider the failure criterion as (a) Ultimate stress (b) Yield stress (c) Both ultimate and yield stress (d) None

Description : Theories of elastic failure while dealing with brittle materials consider the failure criterion as (a) Ultimate stress (b) Yield stress (c) Both ultimate and yield stress (d) None

Last Answer : (a) Ultimate stress

Theories of elastic failure while dealing with ductile materials consider the failure criterion as (a) Ultimate stress (b) Yield stress (c) Both ultimate and yield stress (d) None

Description : Theories of elastic failure while dealing with ductile materials consider the failure criterion as (a) Ultimate stress (b) Yield stress (c) Both ultimate and yield stress (d) None

Last Answer : (b) Yield stress

Under complex loading, if elastic limit reaches in tension, then failure occurs due to (a) Firstly Maximum principal strain theory (b) Secondly Maximum principal theory of strain energy (c) Thirdly Maximum Principal stress theory (d) None

Description : Under complex loading, if elastic limit reaches in tension, then failure occurs due to (a) Firstly Maximum principal strain theory (b) Secondly Maximum principal theory of strain energy (c) Thirdly Maximum Principal stress theory (d) None

Last Answer : (c) Thirdly Maximum Principal stress theory

Under complex loading, if elastic limit reaches in tension, then failure occurs due to (a) Firstly Maximum principal strain theory (b) Secondly Maximum principal theory of strain energy (c) Thirdly Maximum shear stress theory (d) None

Description : Under complex loading, if elastic limit reaches in tension, then failure occurs due to (a) Firstly Maximum principal strain theory (b) Secondly Maximum principal theory of strain energy (c) Thirdly Maximum shear stress theory (d) None

Last Answer : (d) None

_____ is a surface fatigue failure which occurs when the load on the bearing part exceeds the surface endurance strength of the material. (a) Scoring (b) Pitting (c) Corrosion

Description : _____ is a surface fatigue failure which occurs when the load on the bearing part exceeds the surface endurance strength of the material. (a) Scoring (b) Pitting (c) Corrosion

Last Answer : (b) Pitting

The yield point in static loading is ............... as compared to fatigue loading. (a) higher (b) lower (c) same

Description : The yield point in static loading is ............... as compared to fatigue loading. (a) higher (b) lower (c) same

Last Answer : (a) higher

When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is (a) 0.20 (b) 0.35 (c) 0.50 (d) 0.65

Description : When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is (a) 0.20 (b) 0.35 (c) 0.50 (d) 0.65

Last Answer : (c) 0.50

Theories of elastic failure is the (a) Firstly analysis of the various failures (b) Secondly analysis of the strength of a material (c) Both (a) & (b) (d) None

Description : Theories of elastic failure is the (a) Firstly analysis of the various failures (b) Secondly analysis of the strength of a material (c) Both (a) & (b) (d) None

Last Answer : (c) Both (a) & (b)

Theories of elastic failure help in the (a) Material development (b) Development of method of manufacture (c) Both (a) & (b) (d) None

Description : Theories of elastic failure help in the (a) Material development (b) Development of method of manufacture (c) Both (a) & (b) (d) None

Last Answer : (c) Both (a) & (b)

The property of the bearing material to yield and adopt its shape to that of journal is called (A) Embeddability (B) Conformability (C) Viscosity (D) Endurance limit stress

Description : The property of the bearing material to yield and adopt its shape to that of journal is called (A) Embeddability (B) Conformability (C) Viscosity (D) Endurance limit stress

Last Answer : (B) Conformability

Line joining S yt (yield strength of the material) on mean stress axis and S e (endurance limit of the component) on stress amplitude axis is called as _____ a. Goodman line b. Soderberg line c. Gerber line d. None of the above

Description : Line joining S yt (yield strength of the material) on mean stress axis and S e (endurance limit of the component) on stress amplitude axis is called as _____ a. Goodman line b. Soderberg line c. Gerber line d. None of the above

Last Answer : b. Soderberg line

At ‘yield point’ of a copper wire A. the load hasn't exceeded the elastic limit yet; so, Hooke's law applies B. the load has already exceeded the elastic limit and the material has become plastic C. even the plastic stage has passed and the wire has snapped already D. Like Brass and Bronze, Copper has no yield poin

Description : At yield point' of a copper wire A. the load hasn't exceeded the elastic limit yet; so, Hooke's law applies B. the load has already exceeded the elastic limit and the material has become ... stage has passed and the wire has snapped already D. Like Brass and Bronze, Copper has no yield poin

Last Answer : the load has already exceeded the elastic limit and the material has become plastic

The limit beyond which the material does not behave elastically is known as (a) Proportional limit (b) Elastic limit (c) Plastic limit (d) Yield Point

Description : The limit beyond which the material does not behave elastically is known as (a) Proportional limit (b) Elastic limit (c) Plastic limit (d) Yield Point

Last Answer : (b) Elastic limit

Propagation of fatigue failure is always due to compressive stresses. a) Due to bending b) Due to tensile c) Due to fatigue d) None of the listed

Description : Propagation of fatigue failure is always due to compressive stresses. a) Due to bending b) Due to tensile c) Due to fatigue d) None of the listed

Last Answer : b) Due to tensile

The connecting rod bolts are tightened up with the initial tension greater than external load so that (A) Failure of bolt will be static (B) The resultant load on bolt will not be affected by external cyclic load (C) The bolt will not fail by fatigue although the external load is fluctuating (D) All the three

Description : The connecting rod bolts are tightened up with the initial tension greater than external load so that (A) Failure of bolt will be static (B) The resultant load on bolt will not be affected by ... ) The bolt will not fail by fatigue although the external load is fluctuating (D) All the three

Last Answer : (D) All the three

There is sufficient plastic deformation prior to fatigue failure, which gives a warning well in advance. a) True b) False

Description : There is sufficient plastic deformation prior to fatigue failure, which gives a warning well in advance. a) True b) False

Last Answer : b) False

Fatigue failure is time dependent failure. a) True b) False

Description : Fatigue failure is time dependent failure. a) True b) False

Last Answer : a) True

The phenomenon of decreased resistance of the materials to fluctuating stresses is the main characteristic of _____ failure. a) Fracture b) Fatigue c) Yielding d) None of the mentioned

Description : The phenomenon of decreased resistance of the materials to fluctuating stresses is the main characteristic of _____ failure. a) Fracture b) Fatigue c) Yielding d) None of the mentioned

Last Answer : b) Fatigue

Fatigue resistance of a material is measured by the (A) Elastic limit (B) Ultimate tensile strength (C) Young's modulus (D) Endurance limit

Description : Fatigue resistance of a material is measured by the (A) Elastic limit (B) Ultimate tensile strength (C) Young's modulus (D) Endurance limit

Last Answer : (D) Endurance limit

spring material should have low (A) Elastic limit (B) Deflection value (C) Fatigue resistance (D) None of these

Description : spring material should have low (A) Elastic limit (B) Deflection value (C) Fatigue resistance (D) None of these

Last Answer : Option D

spring material should have low (A) Elastic limit (B) Deflection value (C) Fatigue resistance (D) None of these

Description : spring material should have low (A) Elastic limit (B) Deflection value (C) Fatigue resistance (D) None of these

Last Answer : Option D

The most important property for the spring material is (a) High elastic limit (b) High deflection value (c) Resistance to fatigue and shock (d) All of these

Description : The most important property for the spring material is (a) High elastic limit (b) High deflection value (c) Resistance to fatigue and shock (d) All of these

Last Answer : (d) All of these

The most important property for the spring material is (a) High elastic limit (b) High deflection value (c) Resistance to fatigue and shock (d) All of these

Description : The most important property for the spring material is (a) High elastic limit (b) High deflection value (c) Resistance to fatigue and shock (d) All of these

Last Answer : (d) All of these

The connecting rod bolts are tightened up so that the initial tightening stress (A) Approaches yield point (B) Approaches endurance limit (C) Approaches (yield point stress/factor of safety) (D) Approaches (endurance limit stress/factor of safety)

Description : The connecting rod bolts are tightened up so that the initial tightening stress (A) Approaches yield point (B) Approaches endurance limit (C) Approaches (yield point stress/factor of safety) (D) Approaches (endurance limit stress/factor of safety)

Last Answer : (A) Approaches yield point

The relationship between the alternating stress and mean stress is given by the following equation: σ a =σ e [1-(σ m /σ u )x], where σ e is the fatigue limit for completely reversed loading. The value of x for Gerber line is equal to _________ a) 1 b) 2 c) 0.5 d) -1

Description : The relationship between the alternating stress and mean stress is given by the following equation: σ a =σ e [1-(σ m /σ u )x], where σ e is the fatigue limit for completely reversed loading. The value of x for Gerber line is equal to _________ a) 1 b) 2 c) 0.5 d) -1

Last Answer : b) 2

For a homogeneous & isotropic body under hydrostatic pressure, which theory of elastic failure does not fail (a) Firstly Maximum Principal Theory (b) Secondly Maximum Shear Stress Theory (c) Thirdly Maximum Principal Energy Theory (d) None

Description : For a homogeneous & isotropic body under hydrostatic pressure, which theory of elastic failure does not fail (a) Firstly Maximum Principal Theory (b) Secondly Maximum Shear Stress Theory (c) Thirdly Maximum Principal Energy Theory (d) None

Last Answer : (a) Firstly Maximum Principal Theory

Theories of elastic failure establishes the (a) Firstly Reasons of failure (b) Secondly Reasons of safety (c) Both (a) & (b) (d) None

Description : Theories of elastic failure establishes the (a) Firstly Reasons of failure (b) Secondly Reasons of safety (c) Both (a) & (b) (d) None

Last Answer : (c) Both (a) & (b)

Theories of elastic failure help to recognize (a) Weak materials (b) Strong materials (c) Both weak and strong materials (d) None

Description : Theories of elastic failure help to recognize (a) Weak materials (b) Strong materials (c) Both weak and strong materials (d) None

Last Answer : (c) Both weak and strong materials

Under complex loading, theories of elastic failure establishes the (a) Margin of failure (b) Margin of safety (c) Both (a) & (b) (d) None

Description : Under complex loading, theories of elastic failure establishes the (a) Margin of failure (b) Margin of safety (c) Both (a) & (b) (d) None

Last Answer : (b) Margin of safety

The spring operates (A) Within plastic limit (B) Within elastic limit (C) Within elasto-plastic limit (D) Within visco-elastic limit

Description : The spring operates (A) Within plastic limit (B) Within elastic limit (C) Within elasto-plastic limit (D) Within visco-elastic limit

Last Answer : (B) Within elastic limit

Stresses encountered in the metal forming processes are less than the __________ of the material. (A) Fracture strength (B) Yield strength(C) Elastic limit (D) Limit of proportionality

Description : Stresses encountered in the metal forming processes are less than the __________ of the material. (A) Fracture strength (B) Yield strength (C) Elastic limit (D) Limit of proportionality

Last Answer : Option A

When stress is increased beyond elastic limit and material is permanently changed this property is a) Permanent stress b) Elasticity c) Yield strength d) Plasticity

Description : When stress is increased beyond elastic limit and material is permanently changed this property is a) Permanent stress b) Elasticity c) Yield strength d) Plasticity

Last Answer : d) Plasticity

Total strain energy theory for the failure of a material at elastic limit, is known (A) Guest's or Trecas' theory (B) St. Venant's theory (C) Rankine's theory (D) Haig's theory

Description : Total strain energy theory for the failure of a material at elastic limit, is known  (A) Guest's or Trecas' theory  (B) St. Venant's theory  (C) Rankine's theory  (D) Haig's theory 

Last Answer : (D) Haig's theory 

Shear strain energy theory for the failure of a material at elastic limit, is due to (A) Rankine (B) Guest or Trecas (C) St. Venant (D) Von Mises

Description : Shear strain energy theory for the failure of a material at elastic limit, is due to  (A) Rankine  (B) Guest or Trecas  (C) St. Venant  (D) Von Mises

Last Answer : (D) Von Mises

Maximum shear stress theory for the failure of a material at the elastic limit, is known (A) Guest's or Trecas' theory (B) St. Venant's theory (C) Rankine's theory (D) Haig's theory

Description : Maximum shear stress theory for the failure of a material at the elastic limit, is known  (A) Guest's or Trecas' theory  (B) St. Venant's theory  (C) Rankine's theory  (D) Haig's theory

Last Answer : (A) Guest's or Trecas' theory

Maximum strain theory for the failure of a material at the elastic limit, is known as (A) Guest's or Trecas' theory (B) St. Venant's theory (C) Rankine's theory (D) Haig's theory

Description : Maximum strain theory for the failure of a material at the elastic limit, is known as  (A) Guest's or Trecas' theory  (B) St. Venant's theory  (C) Rankine's theory  (D) Haig's theory 

Last Answer : (B) St. Venant's theory

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) Initiation 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

Description : 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 ... (D) Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface

Last Answer : Option B

The statement : stress is proportional to strain, i.e. the Hooke’s law holds good upto (a) Elastic Limit (b) Proportional Limit (c) Plastic Limit (d) Yield point

Description : The statement : stress is proportional to strain, i.e. the Hooke’s law holds good upto (a) Elastic Limit (b) Proportional Limit (c) Plastic Limit (d) Yield point

Last Answer : (b) Proportional Limit

The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the (A) Fatigue strength (B) Creep strength (C) Resilience (D) Endurance limit

Description : The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the (A) Fatigue strength (B) Creep strength (C) Resilience (D) Endurance limit

Last Answer : D) Endurance limit

Among maximum shear stress theory and distortion energy theory, which gives the higher value shear yield strength? a) Maximum shear stress theory b) Distortion energy theory c) Both give equal values d) Vary from material to material

Description : Among maximum shear stress theory and distortion energy theory, which gives the higher value shear yield strength? a) Maximum shear stress theory b) Distortion energy theory c) Both give equal values d) Vary from material to material

Last Answer : b) Distortion energy theory

Among maximum shear stress theory and distortion energy theory, which gives the higher value shear yield strength? a) Maximum shear stress theory b) Distortion energy theory c) Both give equal values d) Vary from material to material

Description : Among maximum shear stress theory and distortion energy theory, which gives the higher value shear yield strength? a) Maximum shear stress theory b) Distortion energy theory c) Both give equal values d) Vary from material to material

Last Answer : b) Distortion energy theory