SOM Unit-1 Simple Stresses and Strain

Updated on 2019/03/21 09:25

QUESTION
Strain is defined as the ratio of
  

  1. Change in volume to original volume
  2. Change in length to original length
  3. Change in cross-sectional area to original cross- sectional area
  4. Any one of above

QUESTION
Young's modulus is defined as the ratio of
  

  1. Volumetric stress and volumetric strain
  2. Lateral stress ans lateral strain
  3. Longitudinal stress and longitudinal strain
  4. Shear stress to shear strain

QUESTION
The unit of Young's modulus is
  

  1. mm/mm
  2. N/cm
  3. N
  4. N/cm2

QUESTION
Deformation per unit length in the direction of force is known as
  

  1. Strain
  2. Lateral strain
  3. Linear strain
  4. Linear stress

QUESTION
In equal and opposite forces applied to a body tends to elongate it the stress so produced is called
  

  1. Internal resistance
  2. Tensile stress
  3. Transverse stress
  4. Working stress

QUESTION
The materials having same elastic properties in all the direction is called
  

  1. Ideal material
  2. Uniform material
  3. Isotropic Material
  4. Practical material

QUESTION
Modulus of rigidity is defined as the ratio of
  

  1. Longitudinal stress and longitudinal strain
  2. Volumetric stress and volumetric strain
  3. Lateral stress and lateral strain
  4. Shear stress and shear strain

QUESTION
The ultimate tensile stress of mild steel compared to ultimate compressive stress is
  

  1. Same
  2. more
  3. less
  4. unpredictable

QUESTION
Tensile strength of a material is obtained by dividing the maximum load during the test by the
  

  1. Area at the time of fracture
  2. Original cross-sectional area
  3. Minimum area after fracture
  4. None of above

QUESTION
The intensity of stress which causes unit strain is called
  

  1. Unit stress
  2. Bulk modulus
  3. Modulus of rigidity
  4. Modulus of elasticity

QUESTION
Which of the following has no unit
  

  1. Surface tension
  2. Bulk modulus
  3. strain
  4. elasticity

QUESTION
The property of material by virtue of which a body returns to its original shape after removal of the load is called
  

  1. Plasticity
  2. elasticity
  3. ductility
  4. malleability

QUESTION
The material which exhibit the same elastic properties in all direction are called
  

  1. Homogeneous
  2. inelastic
  3. isotropic
  4. isentropic

QUESTION
The property of a material which allows it to be drawn into a smaller section is called
  

  1. Plasticity
  2. Ductility
  3. elasticity
  4. malleability

QUESTION
If a material is loaded beyond yield point stress
  

  1. It becomes elastic
  2. It becomes ductile
  3. Its resistance to fatigue to fatigue increases
  4. It loses its tendency to return its original shape

QUESTION
A body is subjected to three mutually perpendicular stresses of equal intensity. The ratio of direct stress to corresponding volumetric strain is called
  

  1. Poisson’s ratio
  2. Bulk modulus
  3. Modulus of rigidity
  4. Modulus of elasticity

QUESTION
A live load is one which
  

  1. Remains constant
  2. Varies with time
  3. Varies continuously
  4. None of these

QUESTION
Hook's law holds good only within
  

  1. Elastic limit
  2. Limit of proportionality
  3. Limit of yield point
  4. None of these

QUESTION
Elasticity of M S specimen is defined by
  

  1. Hooks law
  2. Yield point
  3. Proof stress
  4. Permanent set

QUESTION
Poisson's ratio is defined as the ratio of
  

  1. Longitudinal stress and Longitudinal strain
  2. Lateral stress and Longitudinal stress
  3. Lateral stress and Lateral strain
  4. None of the above

QUESTION
When it is indicated that a member is elastic, it means that when force is applied, it will
  

  1. Not deform
  2. Be safest
  3. Stretch
  4. Not stretch

QUESTION
The ratio of lateral strain to the linear strain within elastic limit is known as
  

  1. Young's modulus
  2. Bulk modulus
  3. Modulus of elasticity
  4. Poisson's ratio

QUESTION
Limiting value of Poisson's ratio are
  

  1. 1 to -0.5
  2. 1 to +0.5
  3. 0 to +0.5
  4. 0 to -0.5

QUESTION
The modulus of elasticity for mild steel is approximately equal to
  

  1. 10 kN/mm2
  2. 80 kN/mm2
  3. 100 kN/mm2
  4. 210 kN/mm2

QUESTION
The unit of stress in S.I. units is
  

  1. Pa
  2. Kgf/mm2
  3. Tonne/m2
  4. any one of these

QUESTION
The tensile strength of ductile materials is  its compressive strength.
  

  1. equal to
  2. less than
  3. greater than
  4. Nearly equal to

QUESTION
The compression test is carried on  materials.
  

  1. ductile
  2. brittle
  3. malleable
  4. plastic

QUESTION
Poisson’s ratio lies in the range for most metals,
  

  1. 0.1 to 0.9
  2. 0.05 to 0.1
  3. 1 to 10
  4. 0.25 to 0.35

QUESTION
Isotropic material behavior can be expressed using  properties are
  

  1. 1
  2. 2
  3. 3
  4. 4

QUESTION
Within elastic limit stress is
  

  1. Inversely proportional to strain
  2. Directly proportional to strain
  3. Square root of strain
  4. Equal to strain

QUESTION
The intensity of stress which causes unit strain is called
  

  1. Unit stress
  2. Modulus of rigidity
  3. Bulk modulus
  4. Modulus of elasticity

QUESTION
A material obeys Hook’s law up to
  

  1. Plastic limit
  2. Elastic limit
  3. Yield point
  4. Limit of proportionality

QUESTION
In a stress strain curve of mild steel there is a point at which there is increase in strain with no increase in stress. This point is called
  

  1. point of failure
  2. point of rupture
  3. yield point
  4. none of these

QUESTION
The region in the stress-strain curve extending from origin to proportional limit is called
  

  1. plastic range
  2. elastic range
  3. semi plastic range
  4. semi elastic range

QUESTION
Deformation of a bar under its own weight as compared to that when subjected to a direct axial load equal to its own weight will be
  

  1. The same
  2. One fourth
  3. Half
  4. Double

QUESTION
For bolts of uniform strength, the shank diameter is made equal to
  

  1. Major diameter of threads
  2. Pitch diameter of threads
  3. Minor diameter of threads
  4. Nominal diameter of threads

QUESTION
A test specimen is stressed slightly beyond the yield point and then unloaded.
Its yield strength will
  

  1. Decrease
  2. Increase
  3. Remains same
  4. Becomes equal to ultimate tensile strength

QUESTION
A rod of length L and diameter D is subjected to a tensile load P. Which of the following is sufficient to calculate the resulting change in diameter?
  

  1. Young's modulus
  2. Shear modulus
  3. Poisson’s ratio
  4. Both Young's modulus and shear modulus

QUESTION
During tensile-testing of a specimen using a Universal Testing Machine, the parameters actually measured include
  

  1. True stress and true strain
  2. Poisson’s ratio and Young's modulus
  3. Engineering stress and engineering strain
  4. Load and elongation

QUESTION
Which of the following materials generally exhibits a yield point?
  

  1. Cast iron
  2. Mild steel
  3. Soft brass
  4. Aluminum

QUESTION
Which one of the following properties is more sensitive to increase in strain rate?
  

  1. Yield strength
  2. Proportional limit
  3. Elastic limit
  4. Tensile strength

QUESTION
For a linearly elastic, isotropic and homogeneous material, the number of elastic constants required to relate stress and strain is:
  

  1. Two
  2. Three
  3. Four
  4. Six

QUESTION
The unit of elastic modulus is the same as those of
  

  1. Stress, shear modulus and pressure
  2. Strain, shear modulus and force
  3. Shear modulus, stress and force
  4. Stress, strain and pressure

QUESTION
In a simple tension test, Hook’s law is valid up to the
  

  1. Elastic limit
  2. Limit of proportionality
  3. Ultimate stress
  4. Breaking point

QUESTION
The percentage elongation of a material as obtained from static tension test depends upon the
  

  1. Diameter of the test specimen
  2. Gauge length of the specimen
  3. Nature of end-grips of the testing machine
  4. Geometry of the test specimen

QUESTION
In a bolted joint two members are connected with an axial tightening force of 2200 N. If the bolt used has metric threads of 4 mm pitch, then torque required for achieving the tightening force is:
  

  1. 0.7 Nm
  2. 1.0 Nm
  3. 1.4 Nm
  4. 2.8 Nm

QUESTION
A tensile force P is acting on a body of length L and area of cross-section A. The change in length would be
  

  1. P/LAE
  2. PE/AL
  3. PL/AE
  4. AL/PE

QUESTION
The ratio of modulus of rigidity to modulus of elasticity for a Poisson's ratio of 0.25 would be
  

  1. 0.5
  2. 0.4
  3. 0.3
  4. 1

QUESTION
The ratio of bulk modulus to modulus of elasticity for a Poisson's ratio of 0.25 would be
  

  1. 0.66
  2. 0.33
  3. 1.33
  4. 1

QUESTION
If D is the diameter of the sphere, then volumetric strain is equal to
  

  1. Two times the strain of diameter
  2. 1.5 times the strain of diameter
  3. three times the strain of diameter
  4. the strain of diameter

QUESTION
A rectangular bar when subjected to an axial pull P
  

  1. Decrease in length and width and increase in thickness
  2. Decrease in length and increase in width and thickness
  3. Increase in length and decrease in Width and thickness
  4. Increase in length, width and thickness

QUESTION
Thermal Stress of unrestrained body will when the temperature of the body is incresead

  

  1. Increased
  2. Decreased
  3. Remains constant
  4. Either A or B

QUESTION
Modulus of Elasticity E is a ratio of
  

  1. Stress to strain
  2. Stress to original length
  3. Deformation to original length
  4. All of these

QUESTION
Elongation for a taper bar with circular cross section is given by...

  

  1. 4PL/πEd2 d1
  2. 4πEd2 d1 /PL
  3. 4PE/πLd2 d1
  4. None of above

QUESTION
The maximum stress produced in a bar of tapering section is at...
  

  1. Larger end
  2. Smaller end
  3. Middle
  4. anywhere

QUESTION
A composite section contains three different materials.The stress in all the different material will be

  

  1. Same
  2. Zero
  3. Different
  4. None of above

QUESTION
A steel bar of 5 mm is heated from 15° C to 40° C and it is not free to expand. The bar will induce
  

  1. no stress
  2. shear stress
  3. tensile stress
  4. compressive stress

QUESTION
When a bar fixed at both ends is cooled to - 5°C, it will develop
  

  1. no stress
  2. shear stress
  3. tensile stress
  4. compressive stress

QUESTION
The stress at which the extension of the material takes place more quickly as compared to the increase in load, is called

  

  1. elastic limit
  2. yield point
  3. ultimate point
  4. breaking point

QUESTION
The work done on a unit volume of material, as simple tensile force is gradually increased from zero to a value causing rupture, is called
  

  1. modulus of elasticity
  2. modulus of toughness
  3. modulus of resilience
  4. none of these

QUESTION
The necking in case of ductile material begins at the
  

  1. Elastic limit point
  2. Upper yield point
  3. Lower yield point
  4. Ultimate point

QUESTION
The temperature stress is a function of
  

  1. Coefficient of linear expansion and and temperature rise
  2. Temperature rise and modulus of elasticity of the material
  3. Coefficient of linear expansion and modulus of elasticity
  4. Coefficient of linear expansion, temperature rise and modulus of elasticity of the material

QUESTION
If the radius of wire stretched by a load is doubled, then its Young's modulus will be
  

  1. doubled
  2. remain unaffected
  3. become one-fourth
  4. become four times

QUESTION
Tensile strength of a material is obtained by dividing the maximum load during the test by the
  

  1. area at the time of fracture
  2. original cross-sectional area
  3. average of (A) and (B)
  4. more or less depending on other factors

QUESTION
Percentage reduction of area in performing tensile test on cast iron may be of the order of
  

  1. 50.00%
  2. 0.00%
  3. 10.00%
  4. 20.00%

QUESTION
True stress-strain curve for materials is plotted between
  

  1. load/original cross-sectional area and change in length/original length
  2. load/instantaneous cross-sectional area original area and log.
  3. load/instantaneous area and instantaneous area/original area
  4. none of the above

QUESTION
During a tensile test on a specimen of 1 cm2 cross-section, maximum load observed was 8 kN and area of cross-section at neck was 0.5 cm2. Ultimate tensile strength of specimen is
  

  1. 4 kN/cm2
  2. 8 kN/cm2
  3. 16 kN/cm2
  4. None of above

QUESTION
For steel, the ultimate strength in shear as compared to in tension is nearly
  

  1. half
  2. same
  3. One third
  4. One

QUESTION
The property of a material by virtue of which a body returns to its original, shape after removal of the load is called
  

  1. plasticity
  2. elasticity
  3. malleability
  4. ductility

QUESTION
For which material the Poisson's ratio is more than unity
  

  1. steel
  2. copper
  3. brass
  4. none of the above

QUESTION
The property of a material by virtue of which it can be beaten or rolled into plates is called
  

  1. reliability
  2. plasticity
  3. ductility
  4. malleability

QUESTION
Rupture stress is
  

  1. breaking stress
  2. load at breaking point/A
  3. load at breaking point/neck area
  4. maximum stress

QUESTION
Linear strain of 0.004 was observed in a steel wire when subjected to tensile pull. What will be the lateral strain if Poisson's ratio is 0.25?
  

  1. -0.01
  2. +0.01
  3. +0.001
  4. -0.001

QUESTION
A steel bar of square cross-section (50 mm x 50 mm) and length 2 m elongates by 1 mm due to axial pull of 10 kN. If the lateral strain is 0.0002 then the change in side of the bar cross-section will be
  

  1. +0.001 mm
  2. +0.01mm
  3. - 0.01 mm
  4. - 0.001 mm

QUESTION
The change in length of a steel rod due to change in temperature depends on …
  

  1. original length
  2. change in temperature
  3. coefficient of expansion
  4. All of these

QUESTION
A steel bar of diameter 50 mm is subjected to a tensile pull 10 kN which results in the diameter shrinking by 20 microns. The lateral strain in this case is …
  

  1. 4 x 10-4
  2. 2 x 10-4
  3. 8 x 10-4
  4. 4 x 10-4

QUESTION
An axial pull of 10 kN is applied to a mild steel bar of section area 200 sq mm. The normal stress induced will be …
  

  1. 50 Pa
  2. 500 Pa
  3. 50 MPa
  4. 500 MPa

QUESTION
A thin mild steel wire is loaded by adding loads in equal increments till it breaks. The extensions noted with increasing loads will behave as under
  

  1. Uniform throughout
  2. Increase uniformly
  3. First increase and then decrease
  4. Increase uniformly first and then increase rapidly

QUESTION
If the radius of wire is stretched by a load of doubled then its Young's modulus will be
  

  1. Doubled
  2. Half
  3. Become four time
  4. Remain unaffected

QUESTION
The total elongation produced in a bar of uniform section hanging vertically downwards due to its own weight is equal to that produced by a weight
  

  1. Of same magnitude as that of bar and applied at the lower end
  2. Half of the weight of bar applied at the lower end
  3. Half of the square of weight of bar applied at lower end
  4. None of above

QUESTION
The elongation produced in a tapered shaft with end diameter d1 and d2 due to tensile or compressive axial load is proportional to
  

  1. D1+ d2
  2. 1/( d1+d2 )
  3. d1d2
  4. 1/( d1d2)

QUESTION
A cylindrical bar of length L meter, after application of load it deforms by l cm. The strains in bar is
  

  1. 100* l/L
  2. 0.1*l/L
  3. 0.01*l /L
  4. l/L

QUESTION
A composite bar made of steel and copper is heated up. The stresses developed in steel and copper will be ...
  

  1. Compressive and tensile
  2. Compressive and bending
  3. Bending and tensile
  4. Tensile and compressive

QUESTION
The extension of a circular bar tapering uniformly from diameter d1 to d2 is same as of uniform circular bar of diameter
  

  1. (d1+d2)/2
  2. (d1-d2)/2
  3. √( d1d2)
  4. √(d12-d22)

QUESTION
The temperature stress is function of
 1.Co-efficient of linear expansion
 2.Temperature rise
 3.Modulus of elasticity.
  

  1. 1 and 2 only
  2. 1 and 3 only
  3. 2 and 3 only
  4. 1, 2 and 3 only

QUESTION
A steel bar of 40 mm × 40 mm square cross-section is subjected to an axial compressive load of 200 kN. If the length of the bar is 2 m and E = 200 GPa, the elongation of the bar will be
  

  1. 1.25 mm
  2. 2.70 mm
  3. 4.05 mm
  4. 5.40 mm

QUESTION
A rod of length L and diameter D is subjected to a tensile load P. Which of the following is sufficient to calculate the resulting change in diameter?
  

  1. Young's modulus
  2. Shear modulus
  3. Poisson's ratio
  4. Both Young's modulus and shear modulus

QUESTION
A solid uniform metal bar of diameter D and length L is hanging vertically from its upper end. The elongation of the bar due to self weight is
  

  1. Proportional to L and inversely proportional to square of D
  2. Proportional to L2 and inversely proportional to square of D
  3. Proportional of L but independent of D
  4. Proportional of U but independent of D

QUESTION
In terms of Poisson's ratio (μ) the ratio of Young's Modulus (E) to Shear
Modulus (G) of elastic materials is
  

  1. 2(1+ μ )
  2. 2(1 − μ )
  3. 0.5(1+ μ )
  4. 0.5(1 − μ )

QUESTION
The relationship between Young's modulus (E), Bulk modulus (K) and Poisson's
ratio (μ) is given by
  

  1. E = 3 K (1 − 2μ )
  2. K = 3 E (1 − 2μ )
  3. E = 3 K (1 − μ )
  4. K = 3 E (1 − μ )

QUESTION
When a beam is said to be of uniform strength, then which one of the following statements is correct?
  

  1. The bending moment is the same throughout the beam
  2. The shear stress is the same throughout the beam
  3. The deflection is the same throughout the beam
  4. The bending stress is the same at every section along its longitudinal axis

QUESTION
If the value of Poisson's ratio is zero, then it means that
  

  1. The material is rigid
  2. The material is perfectly plastic
  3. There is no longitudinal strain in the material
  4. The longitudinal strain in the material is infinite

QUESTION
Which of the following pairs are correctly matched?

  1. Resilience ....... Resistance to deformation.
     2. Malleability ..... Shape change.
     3. Creep ............ Progressive deformation.
     4. Plasticity ....... Permanent deformation.

  

  1. 2, 3 and 4 
  2. 1, 2 and 3 
  3. 1, 2 and 4 
  4. 1, 3 and 4

QUESTION
E, G, K and μ represent the elastic modulus, shear modulus, bulk modulus and
Poisson's ratio respectively of a linearly elastic, isotropic and homogeneous material. To express the stress-strain relations completely for this material, at least

  

  1. E, G and μ must be known
  2. E, K and μ must be known
  3. Any two of the four must be known
  4. All the four must be known

QUESTION
A taper bar of length l with diameter D at base and having specific weight w is suspended freely under its own weight. The elongation of bar will be
  

  1. wl3 /6E
  2. wl3 /E
  3. wl3 /4E
  4. wl3 /3E

QUESTION
The change in the unit volume of a material under tension with increase in its Poisson's ratio will
  

  1. Increase
  2. Decrease
  3. Remain same
  4. Increase initially and then Decrease

QUESTION
The value of Young's modulus E in terms of Shear modulus G and Bulk modulus K is
  

  1. 9KG/(K+G)
  2. 9KG/(G+K)
  3. 9KG/(K+3G)
  4. None of the above

QUESTION
A conical bar of diameter D, axial length L, weight density w is placed vertically. If Young's modulus of the material is E , then change in its axial length will be
  

  1. wL2/2E
  2. WL2/6E
  3. wL2/8E
  4. wL/8E

QUESTION
The ultimate tensile stress for mild steel is  the ultimate compressive stress.
  

  1. equal to
  2. less than
  3. more than
  4. Nearly equal to

QUESTION
The shear modulus of most materials with respect to the modulus of elasticity is
  

  1. equal to half
  2. less than half
  3. more than half
  4. none of these

QUESTION
A bar of length L and constant cross section(A) is hanging vertically. What would be total increase in length due to self weight(W)?
  

  1. WL/AE
  2. 2WL/AE
  3. WL/2AE
  4. None of these

QUESTION
A bar of circular cross section varies uniformly from a cross section 2D to D. If extension of the bar is calculated treating it as a bar of average diameter, then the percentage error will be

  

  1. 10
  2. 25
  3. 33
  4. 50

QUESTION
A mild steel bar is in two parts having equal lengths. The area of cross section of Part I is double that of Part II. If the bar carries an axial load P, then the ratio of elongation in Part I to that in Part II will be

  

  1. 2
  2. 4
  3. 0.5
  4. 0.25

QUESTION
The bulk modulus of elasticity of a material is twice its modulus of rigidity. The Poisson’s ratio of the material is

  

  1. 1/7
  2. 2/7
  3. 3/7
  4. 4/7

QUESTION
In an experiment it is found that the bulk modulus of a material is equal to its shear modulus. The Poisson’s ratio is
  

  1. 0.12
  2. 0.25
  3. 0.38
  4. 0.5

QUESTION
If equal and opposite forces applied to a body tend to elongate it, the stress so produced is called
  

  1. Internal resistance
  2. Tensile stress
  3. Compressive stress
  4. Working stress.

QUESTION
When a bar subjected to an axial pull P, it
  

  1. Decrease in length and width and increase in thickness
  2. Decrease in length and increase in width and thickness
  3. Increase in length and decrease in Width and thickness
  4. Increase in length, width and thickness

QUESTION
A cube is subjected to three mutually perpendicular stresses σ each. If E=Young's modulus & ν =Poisson's ratio of the material, the volumetric strain in the cube is
  

  1. (3σ/E)*(1+ν)
  2. (3σ/E)*(1-ν)
  3. (3σ/E)*(1+2ν)
  4. (3σ/E)*(1-2ν)

QUESTION
The percentage reduction in the area of cross section of a cast iron member during tensile test would be
  

  1. More than 50 %
  2. 25-50 %
  3. 10-25 %
  4. Negligible

QUESTION
For steel, the yield strength in shear as compared to that in tension is nearly
  

  1. Same
  2. Half
  3. One third
  4. Double

QUESTION
The Young's modulus of a wire is defined as the stress which will increase the length of the wire compared to its original length by...

  

  1. Half
  2. Double
  3. Same
  4. One third

QUESTION
The value of Poisson's ratio for cast iron is...
  

  1. 0.01 to 0.1
  2. 0.25 to 0.33
  3. 0.4 to 0.6
  4. 0.23 to 0.27

QUESTION
Stress increasing with time at a constsnt load is ...
  

  1. Creeping
  2. Yielding
  3. Breaking
  4. None of above

QUESTION   Assertion (A): Hook’s law is the constitutive law for a linear elastic material. Reason (R) : Formulation of the theory of elasticity requires the hypothesis that there exists a unique unstressed state of the body, to which the body returns whenever all the forces are removed.
  

  1. Both A and R are individually true and R is the correct explanation of A
  2. Both A and R are individually true but R is not the correct explanation of A
  3. A is true but R is false
  4. A is false but R is true

QUESTION
Match List I with List II and select the correct answer using the codes given
below the Lists:
 A. Ultimate strength    1. Internal structure
 B. Natural strain       2. Change of length per unit instantaneous length
 C. Conventional strain  3. Change of length per unit gauge length
 D. Stress               4. Load per unit area

  

  1. A-1, B-2, C-3, D-4 
  2. A-4, B-3, C-2, D-1 
  3. A-1, B-3, C-2, D-4 
  4. A-4, B-2, C-3, D-1 

QUESTION
Assertion (A): Stress-strain curves for brittle material do not exhibit yield point.
Reason (R): Brittle materials fail without yielding.
  

  1. Both A and R are individually true and R is the correct explanation of A
  2. Both A and R are individually true but R is NOT the correct explanation of A
  3. A is true but R is false
  4. A is false but R is true

QUESTION
When a composite unit consisting of a steel rod surrounded by a cast iron tube is subjected to an axial load.
Assertion (A): The ratio of normal stresses induced in both the materials is equal to the ratio of Young's moduli of respective materials.
Reason (R): The composite unit of these two materials is firmly fastened together at the ends to ensure equal deformation in both the materials.

  

  1. Both A and R are individually true and R is the correct explanation of A
  2. Both A and R are individually true but R is not the correct explanation of A
  3. A is true but R is false
  4. A is false but R is true

QUESTION
A mild steel specimen is tested in tension up to fracture in a Universal Testing Machine. Which of the following mechanical properties of the material can be evaluated from such a test? 

  1. Modulus of elasticity
     2. Yield stress
     3. Ductility
     4. Tensile strength
     5. Modulus of rigidity

    Select the correct answer using the code given below:

  

  1. 1, 3, 5 and 6
  2. 2, 3, 4 and 6
  3. 1, 2, 5 and 6
  4. 1, 2, 3 and 4

QUESTION
Which one of the following pairs is NOT correctly matched?

  

  1. Uniformly distributed stress Force passed through the centroid of the cross-section
  2. Elastic deformation  Work done by external forces during deformation is dissipated fully as heat
  3. Potential energy of strain  Body is in a state of elastic deformation
  4. Hooke's law  Relation between stress and strain

QUESTION
Two bars of same material having diameters in ratio 1:2 are subjected to tensile pull of same magnitude. The tensile stress induced will be in the ratio …
  

  1. 1:4
  2. 4:1
  3. 1:2
  4. 2:1

QUESTION

u9.png

Above figure indicates ..... condition  

  1. Linear Elastic
  2. Linear plastic
  3. Linear elastic – perfectly plastic
  4. Perfect elastic – linearly plastic

QUESTION

u8.png

Above figure indicates ..... condition

  1. Linear Elastic
  2. Linear plastic
  3. Linear elastic – perfectly plastic
  4. Perfect elastic – linearly plastic

QUESTION 

Above figure indicates stress strain curve for...

 u7.png

  1. Cast iron
  2. Mild Steel
  3. Aluminum
  4. Pure copper

QUESTION

u6.png

Above figure indicates stress strain curve for...

  1. Cast iron
  2. Mild Steel
  3. Aluminum
  4. Pure copper

QUESTION

u5.png

Above figure indicates stress strain curve for ...

  

  1. Cast iron
  2. Mild Steel
  3. Aluminum
  4. Pure copper

QUESTION
In the below figure, corresponding to point c is

u4.png

  1. Elastic limit
  2. Upper yield point
  3. Lower yield point
  4. Proportional limit point

QUESTION
A bar of square cross section is subjected to an axial tensile force such that the longitudinal strain in the bar is e. If the Poisson’s ratio of the bar is 0.3 the volumetric strain in the bar will be
  

  1. 0.4 e
  2. 0.6 e
  3. 3 e
  4. 1.6 e

QUESTION
If all the dimensions of a prismatic bar of square cross section suspended freely from the ceiling of a roof are doubled then the total elongation produced by its own weight will increase
  

  1. eight times
  2. four times
  3. three times
  4. two times

QUESTION
A given material has Young’s modulus E, modulus of rigidity G and Poisson’s ratio 0.25.
The ratio of Young’s modulus to modulus of rigidity of the material is
  

  1. 3.75
  2. 3
  3. 2.5
  4. 1.5

QUESTION
A cylindrical bar of 20 mm diameter and 1 m length is subjected to a tensile test. Its longitudinal strain is 4 times that of its lateral strain. If the modulus of elasticity is 2 x 105N/mm2, then its modulus of rigidity is
  

  1. 8 x 106 N/mm2
  2. 8 x 105 N/mm2
  3. 0.8 x 104 N/mm2
  4. 0.8 x 105 N/mm2

QUESTION
A cylindrical bar of 20 mm diameter and 1 m length is subjected to a tensile test. Its longitudinal strain is 4 times that of its lateral strain. If the modulus of elasticity is 2 x 105N/mm2, then its modulus of rigidity is
  

  1. 8 x 106 N/mm2
  2. 8 x 105 N/mm2
  3. 0.8 x 104 N/mm2
  4. 0.8 x 105 N/mm2

QUESTION
A bar of uniform cross section is subject to uni-axial tension and develops a strain in the direction of the force of 1/800. Assuming m = 1/3, the change of volume per unit volume will be

  

  1. 1/1000
  2. 1/1200
  3. 1/2400
  4. 1/4800

QUESTION
A bar 4 cm in diameter is subjected to an axial load of 4 t. The extension of the bar over a gauge length of 20 cm is 0.03 cm. The decreases in diameter is 0.0018 cm. The Poisson’s ratio is

  

  1. 0.25
  2. 0.30
  3. 0.33
  4. 0.35

QUESTION
A bar 30 mm in diameter was subjected to tensile load of 54 kN and the measured
 extension on 300 mm gauge length was 0.112 mm and change in diameter was 0.00366
 mm. Poisson’s ration will be
  

  1. 0.25
  2. 0.326
  3. 0.356
  4. 0.28

QUESTION
A mild steel bar is in two parts having equal lengths. The area of cross section of Part I is double that of Part II. If the bar carries an axial load P, then the ratio of elongation in Part I to that in Part II will be

  

  1. 2
  2. 4
  3. 1/2
  4. 1/4

QUESTION
A composite bar is made of strips of materials 1 and 2, each having area of cross section 50 mm2. Under an applied load of 3 kN, stress in material 1 is 20 N/mm2. If E for material 1 is 100 kN/mm2, what is the value of E for material 2.
  

  1. 50 kN/mm2
  2. 100 kN/mm2
  3. 150 kN/mm2
  4. 200 kN/mm2

QUESTION
A round steel rod a of diameter D and length L is subjected to an axial load P. another steel bar B tapered with diameter D at one end uniformly tapering to diameter 0.4D at the other end, length L is also subjected to same axial load P. the ratio of change in length in bar A to the change in length in bar B is
  

  1. 2.5
  2. 1.6
  3. 0.8
  4. 0.4

QUESTION
A cube of of mild steel is subjected to principal stress p,p,p in 3 directions. The Poisson’s ratio of mild steel is 0.3. The ratio of volumetric strain to longitudinal strain in any direction is
  

  1. 1.2
  2. 1.8
  3. 2.4
  4. 3.0

QUESTION
A steel bar of square section tapering from 25mm X 25mm at one end to 20 mm X 20 mm at the other end is subjected to an axial force of 10 kN. The length of the bar is 1 meter and its young’s modulus is 100 kN/mm2 what is the change in the length of the bar
  

  1. 2 mm
  2. 0.2 mm
  3. 0.02 mm
  4. 0.01 mm

QUESTION
A bar 50 mm long is subjected to a tensile stress. If the change in its length is 0.025 mm and young’s modulus is 100 kN/mm2, the stress in bar is
  

  1. 250 N/mm2
  2. 100 N/mm2
  3. 50 N/mm2
  4. 25 N/mm2

QUESTION
A steel bolt passes centrally through a brass tube. At the the ends washers and nuts are provided. Nuts are tightened so as to produce a compressive stress of 50 N/mm2 in brass tube. The area of cross section of brass tube and steel bolt is 500 mm2 each. Esteel = 2Ebrass.
What is the stress developed in steel rod.
  

  1. 200 N/mm2 (tensile)
  2. 200 N/mm2 (compressive)
  3. 50 N/mm2 (tensile)
  4. 100 N/mm2( compressive)

QUESTION
The extension of a circular bar tapering uniformly from diameter d1 at one end to diameter d2 at the other end, and subjected to an axial pull of P is  the extension of a circular bar of diameter d1 d2 subjected to the same load P.
  

  1. equal to
  2. less than
  3. greater than
  4. Sometimes less, Sometime more

QUESTION
A specimen of 1.2 cm2 cross sectional area and a length 10 cm is tested under tension . The max load recorded by universal testing machine is 60Kn, the area at the neck 0.8cm2 the ultimate strength of the material is
  

  1. 750 N/mm2
  2. 600 N/mm2
  3. 500 N/mm2
  4. None of these

QUESTION
During a tensile test on a specimen of 1cm2 cross-section, maximum load observed was 8 tonnes and area of cross-section at neck was 0.5 cm2.Ultimate tensile strength of specimen is
  

  1. 4 tonnes/cm2
  2. 8 tonnes/cm2
  3. 16 tonnes/cm2
  4. 22 tonnes/cm2

QUESTION
A spherical ball of volume 1000 cm3 is subjected to a hydrostatic pressure of 18 N/mm2. If
 bulk modulus of ball is 180 N/mm2. The change in the volume the ball will be
  

  1. 1000 mm3
  2. 100 mm3
  3. 10 mm3
  4. 5 mm3

QUESTION
A composite bar is made of aluminum and steel strips each of 200 mm2 area of cross section. If E steel = 3 E aluminum and stress in steel is 15 N/mm2, due to an axial load P, what is the value of P ?
  

  1. 12 kN
  2. 6 kN
  3. 4 kN
  4. 2 kN

QUESTION
A copper bar 2 cm diameter is completely encased in steel tube or inner diameter 2 cm and outer diameter 4 cm. Under an axial load, stress in a steel tube is 100 N/mm2 , If E steel = 2*E copper, what will be stress in copper bar
  

  1. 300 N/mm 2 
  2. 100 N/mm 2 
  3. 50 N/mm 2  
  4. 33.33 N/mm 2

QUESTION
A composite bar of copper and steel is heated. The ratio of tensile force in steel and compressive stress in copper will be
  

  1. 1
  2. 0.5
  3. 2
  4. 25

QUESTION

u3.png

For the circular bar as shown above,if the elastic modulus and coefficient of thermal expansion for steel are 200 GPa and 11.7 × 10-6 per °C respectively and for copper 70 GPa and 21.6 × 10-6 per °C respectively and if the temperature of the rod is raised by 50°C, then the free expansion of the rod will be
  

  1. 1.1025 mm (Tensile)
  2. 1.1025 cm (Compressive)
  3. 1.1025 mm (Compressive)
  4. 0.1025 mm (Tensile)

QUESTION

u3.png

Refering the above figure if the free expansion of the stepped shaft is 1.1025 mm
(Compressive) then the deflection responsible for the temperature stress induced will be ....

  

  1. 0.0725 mm
  2. 0.7025 mm
  3. 0.7025 cm
  4. 1.7025 mm

QUESTION

Untitled1.png

If a rigid beam of negligible weightis supported in a horizontal position by two rods of steel and aluminum, 2 m and 1 m long having values of cross – sectional areas 1 cm2 and 2 cm2 and E of 200 GPa and 100 GPa respectively and if a load P is applied as shown in the figure then for the rigid beam to remain horizontal ....
  

  1. The forces on both sides should be equal
  2. The force on aluminum rod should be twice the force on steel
  3. The force on the steel rod should be twice the force on aluminum
  4. The force P must be applied at the centre of the beam

QUESTION

Untitled.png

For the stepped shaft as shown in the figure if Es = 210 GN/m2 and Eb = 105 GN/m2, then the maximum normal stress in section CD will be .....

  

  1. 12.73 N/m2
  2. 12.73 MN/m
  3. 12.73 MN/m2
  4. 12.73 KN/m2

QUESTION

Untitled.png

For the stepped shaft as shown in the figure if Es = 210 GN/m2 and Eb = 105 GN/m2, then the maximum normal stress in section AB will be .....

  

  1. 88.42 N/m2
  2. 88.42 GN/m2
  3. 88.42 KN/m2
  4. 88.42 MN/m2

QUESTION

Untitled.png

For the stepped shaft as shown above, if the deflections in AB, BC, CD sections are 6.3157x10-5m,1.3466x10-5m, and 1.5154x10-5m respectively, then the net elongation of the stepped shaft will be....

  

  1. 9.1777 x10-5 cm
  2. 9.1777 x10-5m
  3. 9.1777 x10-5mm
  4. 9.1777 x10-3mm
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Created by Vishal E on 2019/03/21 09:25
    
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