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

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
by

1 Answer

Answer :

(c) endurance limit to the working stress
by

Related questions

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

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

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

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

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

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

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

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

Description : 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

Last Answer : (d) below the yield point

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

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

The ability of a material to resist plastic deformation known as _____________ a) Tensile strength b) Yield strength c) Modulus of elasticity d) Impact strength

Description : The ability of a material to resist plastic deformation known as _____________ a) Tensile strength b) Yield strength c) Modulus of elasticity d) Impact strength

Last Answer : b) Yield strength

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

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

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

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

Factor of safety in machine design is defined as the ratio of ultimate stress to __________ stress. (A) Working (B) Bearing (C) Yield (D) None of these

Description : Factor of safety in machine design is defined as the ratio of ultimate stress to __________ stress. (A) Working (B) Bearing (C) Yield (D) None of these

Last Answer : Option A

If compressive yield stress and tensile yield stress are equivalent, then region of safety from maximum principal stress theory is of which shape? a) Rectangle b) Square c) Circle d) Ellipse

Description : If compressive yield stress and tensile yield stress are equivalent, then region of safety from maximum principal stress theory is of which shape? a) Rectangle b) Square c) Circle d) Ellipse

Last Answer : b) Square

Ratio of tensile to strain is A. Young's modulus B. stress C. stiffness D. tensile force

Description : Ratio of tensile to strain is A. Young's modulus B. stress C. stiffness D. tensile force

Last Answer : Young's modulus

Factor of safety is the ratio of the __________ stress to the working stress. (A) Tensile (B) Compressive (C) Yield (D) Bearing

Description : Factor of safety is the ratio of the __________ stress to the working stress. (A) Tensile (B) Compressive (C) Yield (D) Bearing

Last Answer : Option C

_____ 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

According to the ASME code, maximum allowable shear stress is taken as X% of yield strength or Y% of ultimate strength. a) X=30 Y=18 b) X=30 Y=30 c) X=18 Y=18 d) X=18 Y=30

Description : According to the ASME code, maximum allowable shear stress is taken as X% of yield strength or Y% of ultimate strength. a) X=30 Y=18 b) X=30 Y=30 c) X=18 Y=18 d) X=18 Y=30

Last Answer : a) X=30 Y=18

According to the ASME code, maximum allowable shear stress is taken as X% of yield strength or Y% of ultimate strength. a) X=30 Y=18 b) X=30 Y=30 c) X=18 Y=18 d) X=18 Y=30

Description : According to the ASME code, maximum allowable shear stress is taken as X% of yield strength or Y% of ultimate strength. a) X=30 Y=18 b) X=30 Y=30 c) X=18 Y=18 d) X=18 Y=30

Last Answer : a) X=30 Y=18

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

Cast iron has (A) Very high tensile strength (B) High ductility (C) High malleability (D) Elastic limit close to ultimate breaking strength

Description : Cast iron has (A) Very high tensile strength (B) High ductility (C) High malleability (D) Elastic limit close to ultimate breaking strength

Last Answer : (D) Elastic limit close to ultimate breaking strength

Cast iron has (A) High ductility (B) High malleability (C) Very high tensile strength (D) Its elastic limit very close to ultimate breaking strength

Description : Cast iron has (A) High ductility (B) High malleability (C) Very high tensile strength (D) Its elastic limit very close to ultimate breaking strength

Last Answer : (D) Its elastic limit very close to ultimate breaking strength

Cast iron is having very high (A) Proximity between its elastic limit and ultimate breaking strength (B) Ductility (C) Tensile strength (D) All (A), (B) and (C)

Description : Cast iron is having very high (A) Proximity between its elastic limit and ultimate breaking strength (B) Ductility (C) Tensile strength (D) All (A), (B) and (C)

Last Answer : (A) Proximity between its elastic limit and ultimate breaking strength

Distortion or change in shape of a cast partial denture clasp during its clinical use probably indicates that the: A. Ductility was too low B. Hardness was too great C. Ultimate tensile strength was too low D. Tension temperature was too high E. Elastic limit was exceeded

Description : Distortion or change in shape of a cast partial denture clasp during its clinical use probably indicates that the: A. Ductility was too low B. Hardness was too great C. Ultimate tensile strength was too low D. Tension temperature was too high E. Elastic limit was exceeded

Last Answer : E. Elastic limit was exceeded

Which of the following mechanical properties of a material is most structure insensitive? (A) Modulus of elasticity (young's modulus) (B) Toughness (C) Percentage reduction of area (D) Tensile strength

Description : Which of the following mechanical properties of a material is most structure insensitive? (A) Modulus of elasticity (young's modulus) (B) Toughness (C) Percentage reduction of area (D) Tensile strength

Last Answer : (A) Modulus of elasticity (young's modulus)

Steel rods are normally used for concrete reinforcement because concrete and steel have almost equal (A) Tensile strength (B) Compressive strength (C) Young's modulus (D) Thermal co-efficient of expansion

Description : Steel rods are normally used for concrete reinforcement because concrete and steel have almost equal (A) Tensile strength (B) Compressive strength (C) Young's modulus (D) Thermal co-efficient of expansion

Last Answer : (D) Thermal co-efficient of expansion

Young's modulus of a material is the measure of its (A) Stiffness (B) Malleability (C) Creep resistance (D) Tensile strength

Description : Young's modulus of a material is the measure of its (A) Stiffness (B) Malleability (C) Creep resistance (D) Tensile strength

Last Answer : Option A

Young's modulus is defined as A. tensile strain/tensile stress B. tensile stress/tensile strain C. tensile stress × tensile strain D. length/area

Description : Young's modulus is defined as A. tensile strain/tensile stress B. tensile stress/tensile strain C. tensile stress × tensile strain D. length/area

Last Answer : tensile stress/tensile strain

Young’s Modulus of elasticity is (a)Tensile stress / Tensile strain (b)Shear stress / Shear strain (c)Tensile stress / Shear strain (d)Shear stress / Tensile strain

Description : Young’s Modulus of elasticity is (a)Tensile stress / Tensile strain (b)Shear stress / Shear strain (c)Tensile stress / Shear strain (d)Shear stress / Tensile strain

Last Answer : a)Tensile stress / Tensile strain

Wohler test is a destructive test to find out the __________ strength of a prepared metal specimen. (A) Creep (B) Fatigue (C) Endurance (D) Tensile

Description : Wohler test is a destructive test to find out the __________ strength of a prepared metal specimen. (A) Creep (B) Fatigue (C) Endurance (D) Tensile

Last Answer : (B) Fatigue

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 property of the bearing material to allow the dust and abrasive particles to get absorbed on the surface of the lining is called (A) Embeddability (B) Conformability (C) Viscosity (D) Endurance limit stress

Description : The property of the bearing material to allow the dust and abrasive particles to get absorbed on the surface of the lining is called (A) Embeddability (B) Conformability (C) Viscosity (D) Endurance limit stress

Last Answer : (A) Embeddability

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

Which of the following relationships is correct for relating the three elastic constants of an isotropic elastic material (where, E = Young's modulus, G = Modulus of rigidity or shear modulus v = Poisson's ratio)? (A) E = 2G (1 + v) (B) E = G (1 + v) (C) E = G (1 + v)/2 (D) E = 2G (1 + 2v)

Description : Which of the following relationships is correct for relating the three elastic constants of an isotropic elastic material (where, E = Young's modulus, G = Modulus of rigidity or shear modulus v = Poisson's ratio)? (A) E = 2G (1 + v) (B) E = G (1 + v) (C) E = G (1 + v)/2 (D) E = 2G (1 + 2v)

Last Answer : (A) E = 2G (1 + v)

High endurance limit of carburised machine parts is because of the fact that carburisation (A) Suppresses any stress concentration produced in the parts (B) Enhances the yield point of the material (C) Introduces a compressive layer on the surface (D) Produces a better surface finish

Description : High endurance limit of carburised machine parts is because of the fact that carburisation (A) Suppresses any stress concentration produced in the parts (B) Enhances the yield point of the material (C) Introduces a compressive layer on the surface (D) Produces a better surface finish

Last Answer : (C) Introduces a compressive layer on the surface

The ductility of metal is usually expressed in terms of the: A. Yield strength (point where the material is not longer elastic) B. Percent elongation C. Modulus of elasticity (stiffness of the material)

Description : The ductility of metal is usually expressed in terms of the: A. Yield strength (point where the material is not longer elastic) B. Percent elongation C. Modulus of elasticity (stiffness of the material)

Last Answer : B. Percent elongation

The ratio of endurance limit in shear to the endurance limit in flexure is (a) 0.25 (b) 0.40 (c) 0.55 (d) 0.70

Description : The ratio of endurance limit in shear to the endurance limit in flexure is (a) 0.25 (b) 0.40 (c) 0.55 (d) 0.70

Last Answer : (c) 0.55

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

Factor of safety is a. Tensile stress / Permissible stress b. Compressive stress / Ultimate stress c. Ultimate stress / Permissible stress d. Ultimate stress / Shear stress

Description : Factor of safety is a. Tensile stress / Permissible stress b. Compressive stress / Ultimate stress c. Ultimate stress / Permissible stress d. Ultimate stress / Shear stress

Last Answer : c. Ultimate stress / Permissible stress

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

The stress which vary from a minimum value to a maximum value of the same nature (i.e. tensile or compressive) is called (a) repeated stress (b) yield stress (c) fluctuating stress (d) alternating stress

Description : The stress which vary from a minimum value to a maximum value of the same nature (i.e. tensile or compressive) is called (a) repeated stress (b) yield stress (c) fluctuating stress (d) alternating stress

Last Answer : (c) fluctuating stress

When the steel is subjected to normalising, its __________ decreases. (A) Yield point (B) Ductility (C) Ultimate tensile strength (UTS)

Description : When the steel is subjected to normalising, its __________ decreases. (A) Yield point (B) Ductility (C) Ultimate tensile strength (UTS)

Last Answer : (B) Ductility

The highest stress that a material can withstand for a specified length of time without excessive deformation is called the __________ strength. (A) Creep (B) Endurance (C) Fatigue (D) None of these

Description : The highest stress that a material can withstand for a specified length of time without excessive deformation is called the __________ strength. (A) Creep (B) Endurance (C) Fatigue (D) None of these

Last Answer : Option A