Strength Of Materials Set 25

Mechanical Engineering

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This set of Strength of Materials Multiple Choice Questions & Answers (MCQs) focuses on Strength Of Materials Set 25

Q1 | Two beams carrying uniformly distributed load have same depth but beams A has width 2nd as compared to width w for beam B. The ratio of elastic strength of beam A compred to that of B will be
  • 4
  • 1
  • The beam is rectangular in section
  • 2
Answer: 2
Q2 | If two unequal rolling loads of unequal weight roll along a beam, the maximum bending moment will occur
  • Under heavy load when the centre of the load is at the centre of beam
  • Under heavy load when the centre of the lighy load is at the centre of the beam.
  • Under heavy load
  • Under light load when centre of the beam bisects the distance between the resultant of the loads and light wheel
  • Under heavy load when the centre of the beam oisects the distance between the resultant of the loads and ligh wheel
Answer: Under heavy load when the centre of the beam oisects the distance between the resultant of the loads and ligh wheel
Q3 | The loss of strength in compression with simultaneous gain in srength in tension due to overloading is known as
  • Banschinger effect
  • Visco-elasticity
  • Hysteresis
  • Creep
  • Inelasticity
Answer: Banschinger effect
Q4 | The kern of a circular section of diameter D is a concentric circular area of diameter
  • 2/3 D
  • 3/4 D
  • D/8
  • D/4
  • 3/5 D
Answer: D/4
Q5 | Tensile stress is
  • Stress measured by the ratio of the increase or decrease in length of the unloaded piece
  • Stress due to any force
  • Stress caused by varying load
  • Stress measured by the ratio of the increase or decrease in length of the unloaded piece under tensile force
  • Stress due to change in length under a load
Answer: Stress measured by the ratio of the increase or decrease in length of the unloaded piece under tensile force
Q6 | The longitudinal strain for a specimen is 0.01 and it is found to undergo 1 mm change in its thickness. The thickness of the specimen will be
  • 10 mm
  • 100 mm
  • 1000 mm
  • 400 mm
  • None of the above
Answer: 100 mm
Q7 | Identify the incorrect statement about true stress-strain method
  • This method can be used for compression tests as well
  • True stress is load per unit area (actual) and sunilarly true strain is determined under actual conditions
  • It is more sensitive to changes in mechanical conditions
  • It is more sensitive to changes in metallurgical conditions
  • There is no such phenomenon like true stress or true strain
Answer: There is no such phenomenon like true stress or true strain
Q8 | Perry-Robertson formula for columns takes into account
  • initial curvature of column
  • initial eccutricity of column
  • both (A) and (B) above
  • None of the above
  • None of the above
Answer: both (A) and (B) above
Q9 | A simply supported beam of span L which carries over its full span a load varying uniformly from zero at either ends to W kg/m at mid-span, will have zero shear force at
  • Ends
  • Mid-spam
  • Both at ends as well as mid-span
  • At L/4 from either end
  • None of the above
Answer: Mid-spam
Q10 | According to Von Mises theory, the elastic failure occurs
  • When the shear strain energy is least
  • When shear strain equals 50% of the value of tensile strain at elastic limit in a simple tension test
  • When the shear strain energy per unit volume in the stressed material equals shear strain energy per unit volume at the elastic limit in a simple tension test
  • None of the above
  • None of the above
Answer: When the shear strain energy per unit volume in the stressed material equals shear strain energy per unit volume at the elastic limit in a simple tension test
Q11 | The slenderness ratio of a column is zero when
  • its length is exactly equal to radius of gyration
  • its length is half the radius of gyration
  • total load carried is less than half the dead weight
  • its length is supported on all sides throughout its full length
  • None of the above
Answer: its length is supported on all sides throughout its full length
Q12 | The ratio of shear modulus to the modulus of elasticity when Poisson's ratio is 0.25 will be
  • 0.4
  • 4
  • 1.4
  • 2
  • 3
Answer: 0.4
Q13 | The theory of failure suitable for brittle materials is
  • distortion energy theory
  • maximum strain energy theory
  • maximum shear stress theory
  • maximum principal stress theory
  • None of the above
Answer: maximum principal stress theory
Q14 | A seamless water main 1 metre in diameter is required to carry wter under a head of 100 metres. If the maximum permissible tensile stress in the metal is 500 kg/cm2, the thickness of metal required would be
  • 25 mm
  • 10 mm
  • 5 mm
  • 15 mm
  • 1 mm
Answer: 10 mm
Q15 | The ratio of central deflection in a beam freely supported at both ends to that when the beam is fixed at both ends and subjected to a central load W in both the cases would be
  • 1
  • 4
  • 2
Answer: 4
Q16 | The moment of inertia of an area is always least with respect to
  • Bottom most axis
  • Radius of gyration
  • Central axis
  • Vertical axis
  • None of the above
Answer: Central axis
Q17 | In case of eccentrically loaded struts
  • Hollow section is preferred
  • Solid section is preferred
  • Composite section is preferred
  • Reinforced section is preferred
  • Any of the above sections mauy be used
Answer: Hollow section is preferred
Q18 | The relation between the bending moment and the moment of resistance e.g. M=fZ applies
  • Only to beams of circular cross-section
  • Only to beams of rectangular cross-section
  • When the beams are strained beyond the elastic limit
  • When the beams are not strained beyond the elastic limit
  • None of the above
Answer: When the beams are not strained beyond the elastic limit
Q19 | A boiler shell 100 cm diameter and plate thickness 12 mm is subjected to an internal pressure of 1.2 N/m2. The hoop stress will be
  • 45 N/m2
  • 135 N/m2
  • 180 N/m2
  • 50 N/m2
  • 155.5 N/m2
Answer: 50 N/m2
Q20 | Unsymmetrical bending is said to occur when
  • The bending moment diagram is unsymmetrical
  • The shear centre does not coincide with neutral axis
  • The beam is subjected to loads that do not lie in a plane containing a principal axis
  • The beam is subjected to thrust in addition to bending moment
  • The beam cross-section is unsymmetrical
Answer: The bending moment diagram is unsymmetrical
Q21 | The column with highest equivalent length has
  • Both ends fixed
  • Both ends hinged and pin jointed
  • One end fixed other end hinged
  • None of the above
  • Measurement of longitudinal strains
Answer: Both ends hinged and pin jointed
Q22 | Rivets are generally specified by
  • Diameter of head
  • Overall length
  • Shape
  • Shank diameter
  • Thickness of plates to be joined
Answer: Shank diameter
Q23 | Brass could not be used to reinforce concrete because
  • its densily is too large
  • its density is too low
  • it is too expensive
  • its coefficient of thermal expansion is not right
  • None of the above
Answer: its coefficient of thermal expansion is not right
Q24 | In a simply supported beam of span 3 mts., a point load of 60 kN acts at a distance of 1 mt. from left support, the shear force at 1 mt. from rt. Support is
  • Moment shear relation
  • 40 kN
  • 60 kN
  • 20 kN
  • 80 kN
Answer: 20 kN
Q25 | The assumptions generally made in the theory of pure bending is
  • The transverse section of the beam suffers permanent distortion
  • The value of the Young's modulus is the same for the beam material in tension as well as in compression
  • The beam is rectangular in section
  • The material of the beam is non-homogeneous
  • The elastic limit is well exceeded
Answer: The value of the Young's modulus is the same for the beam material in tension as well as in compression
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