Strength Of Materials Set 26

Mechanical Engineering

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This set of Strength of Materials Multiple Choice Questions & Answers (MCQs) focuses on Strength Of Materials Set 26

Q1 | For an isotropic, homogeneous and elastic material, which obeys Hooke's law, the number of independent elastic constants is
  • 1
  • 2
  • 3
  • 6
  • None of the above
Answer: 2
Q2 | A steel wire is hang vertically under its own weight. What is the greatest length it can have if the allowable tensile stress is 2000 kg/cm2 and specific weight of steel is 8000 kg/cm
  • 2500 m
  • 3155 m
  • 1250 m
  • 1750 m
  • 2797 m
Answer: 2500 m
Q3 | If the value of Young's modulus of elasticity is zero, it implies that the material is
  • highly elastic
  • plastic
  • visco-elastic
  • incompressible
  • None of the above
Answer: incompressible
Q4 | A bar of copper form a composite system, which is heated to a temperature of 45?C. The stress in the copper bar will be
  • tensile stress
  • compressive stress
  • bursting stress
  • sher stress
  • None of the above
Answer: compressive stress
Q5 | A brittle steel rod is heated to 160?C and then suddenly clamped at both ends. It is then allowed to cool and breaks at a temperature of 85?C. If E = 200 GN/m2 and ? = 12 x 10-5 / ?C, the breaking stress of steel is
  • 60 MN / m2
  • 90 MN / m2
  • 180 MN / m2
  • 360 MN / m2
  • None of the above
Answer: 180 MN / m2
Q6 | Castellated beams are used for
  • light construction
  • resisting bending moment only
  • loads not passing through shear centre
  • sections subjected to alternate compressive and shear stresses
  • None of the above
Answer: light construction
Q7 | For a thin cylinder the ratio longitudinal stress/hoop stress is
  • 1
  • 4
  • 2
  • Between CD
Answer: 1
Q8 | The failure of a material under varying load, after a number of cycles of such load, is known as
  • Brittle failure
  • Fatigue failure
  • Hysteresis failure
  • Impact failure
  • Ductile failure
Answer: Fatigue failure
Q9 | The yield point in fatique loading as compared to the yield point in static loading is
  • Half
  • There is no comparison between the two
  • Higher
  • Same
  • One fourth
Answer: Higher
Q10 | The slenderness rtio 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
Q11 | A perfect frame has N joints. The number of members should not be less than
  • 2N - 5
  • 2N - 3
  • 2N - 1
  • N - 1
  • 2N - 2
Answer: 2N - 3
Q12 | Rupture stress is
  • Breaking stress
  • Highest value of stress
  • Stress at breaking point
  • Proof stress
  • Stress given by dividing the load at the moment of incipient fracture, by the area supporting that load
Answer: Stress given by dividing the load at the moment of incipient fracture, by the area supporting that load
Q13 | Which material has highest value of Poisson's ratio
  • Copper
  • Steel
  • Wood
  • Rubber
  • Concrete
Answer: Rubber
Q14 | The value of Poisson's ratio for cork is
  • 0.44
  • 0.1
  • Zero
  • 0.2
  • 0.3
Answer: Zero
Q15 | The approximate value of allowable stress for carbon steel under static loading (in kg/cm2) is
  • 500 - 1000
  • 4000 - 7500
  • 10,000 - 15,000
  • 15,000 - 20,000
  • 20,000 - 25,000
Answer: 4000 - 7500
Q16 | A type of riveted joint in which the rivets in the adjacent rows are staggered and the outer-most row has only rivert, is known as
  • Chain riveting
  • Butt-riveting
  • Diamond riveting
  • Criss-cross riveting
  • Zig-zag riveting
Answer: Diamond riveting
Q17 | The state of pure shear stress is produced by
  • equal tension in two directions at right angles
  • equal compression in two-directions at right angle
  • tension in one direction and equal compression in perpendicular direction
  • a moment and couple in opposite directions
  • None of the above
Answer: tension in one direction and equal compression in perpendicular direction
Q18 | Principal planes are the planes on which the resultant stress is the
  • shear stress
  • normal stress
  • tangential stress
  • temperature stress
  • None of the above
Answer: normal stress
Q19 | If a column fails due to buckling, it is likely to be a
  • Long column
  • Short column
  • Strut
  • Reinforced column
  • None of the above
Answer: Long column
Q20 | The numerical values of Young's modulus of clasticity in ascending order for Aluminium, Bronze, Brass, Inconel and Muntz metal are given by
  • Aluminium, Bronze, Brass, Muntz metal, Inconel.
  • Muntz metal, Aluminium, Bronze, Brass, Inconel
  • Muntz metal, Brass, Aluminium, Bronze, Inconel
  • Inconel, Muntz metal, Aluminium, Bronze, Brass
  • Aluminium, Bronze, Muntz metal, Inconel, Brass
Answer: Muntz metal, Brass, Aluminium, Bronze, Inconel
Q21 | The tangential stress is
  • 21.5 MPa
  • 36 MPa
  • 48 MPa
  • 26 MPa
  • None of the above
Answer: 36 MPa
Q22 | A solid circular shaft of diameter D carries are axial load W. If the same load is applied axially on a hollow circular shaft of inner diameter D/2, the ratio of stress in a solid shaft to a hallow one is
  • 1?4
  • 4?3
  • 1?2
  • Moment shear relation
  • 3?4
Answer: 3?4
Q23 | a diagram which respresents the variation of axial load along the length of simply supported beam is called
  • Shear force diagram
  • Bending moment diagram
  • Stress diagram
  • Thrust diagram
  • None of the above
Answer: Thrust diagram
Q24 | Eccentrically loaded columns are generally subjected to
  • axial compression and tension
  • bending stress and axial compression
  • shear stress and axial compression
  • bending stress, shear stress and axial compression
  • None of the above
Answer: shear stress and axial compression
Q25 | The stress in the cylinder will be
  • 12 N/mm2
  • 24 N/mm2
  • 6 N/mm2
  • 20 N/mm2
  • 18 N/mm2
Answer: 12 N/mm2
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