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This set of Strength of Materials Multiple Choice Questions & Answers (MCQs) focuses on Strength Of Materials Set 28
Q1 | A circular section of steel 20 mm diameter is subjected to an axial force of 100 kg. The components of force normal and tangential to a plane inclined to the axis of bar will be
- 54 kg
- 70.7 kg
- 100 kg
- 141 kg
- 80 kg
Q2 | In the case of biaxial state of normal stresses, the normal stress on 45? plane is equal to
- the sum of the normal stresses
- the difference of the normal stresses
- half the sum of the normal stress
- half the difference of normal stresses
- None of the above
Q3 | An axial load P is applied on a circular section of diameter D. If the same load is applied on a hollow circular shaft with inner diameter as D/2, the ratio of stress in two cases would be
- 3?4
- 8?3
- 4?3
- 9?8
- 1
Q4 | A copper rod 15 mm diameter 0.8 m long is heated through 50?C. The expansion of the rod is prevented by gripping it at both ends. When the grips do not yield, the stress in rod is 115 N/mm2 and forces applied at the grips are 20 kN. In case one of the grip yields by 0.5 mm
- the rod will be under tension
- the force at grips will be increase
- the compressive stress in the rod will increase
- the compressive stress in the rod will reduce
- None of the above
Q5 | Approximate horse power that can be transmitted by a shaft 60 mm dimeter at 180 rpm with permissible shear stress of 850 kg/cm2 would be
- 30 - 35
- 35 - 50
- 60 - 85
- 85 - 95
- 50 - 60
Q6 | The efficiency of a riveted joint is defined as the ratio of actual strength of the joint to that of solid plate. In this strength of the joint is considered in
- Tension
- Compression (bearing)
- Shear
- Least of (A), (B) and (C) above
- None of the above
Q7 | A rectangular beam 200 mm deep by 100 mm wide-subjected to maximum bending moment of 500 kNm. The maximum stress in the beam will be
- 250 N/mm2
- 500 N/mm2
- 750 N/mm2
- 1500 N/mm2
- None of the above
Q8 | For a given stress the ratio of moment of resistance of a square beam with its side horizontal compared to when the diagonal is horizontal is
- 1.5
- ?2
- 1.2
- 2
- depends on external load and moment of inertia
Q9 | A prismatic steel bar 25 cm long is subjected to axial compressive force of 2000 kg. For steel E = 2 x 106 kg/cm2. The ratio of strain energy when the cross-sectional area is 25 sq. cm to that when the cross-section area is 12.5 sq cm, would be
- 0.5
- 1
- 0.25
- 2
- 4
Q10 | In laminated spring the strips are provided in different lengths for
- Space consideration of the utility stage
- Reducing the weight
- Equal distribution of stress
- Material economy
- Improved sppearance
Q11 | The modulus of resilience in shear is nearly
- 380 kJ/m3
- 260 kJ/m3
- 150 kJ/m3
- 95 kJ/m3
- None of the above
Q12 | The numerical values of Young's modulus of elasticity in descending order for wood, lead, glass, steel and phospor brouze is given by
- Steel, Wood, Lead Phosphor-bronze, Glass
- Steel, Glass, Phosphor-bronze, Lead Wood
- Steel, Phosphor-bronze, Glass, Lead and Wood
- Steel, Lead, Wood, Phosphor-bronze, Glass
- Steel, Phosphor-bronze, Wood, Glass, Lead
Q13 | The damping capacity of a material is its capacity to
- Provide rigid joints
- Neutralise torsional stress
- Absorb shocks and vibrations
- Absorb noise
- Withstand shear stress
Q14 | A section is subjected to reversal of stress. Choice exists for selecting any of the following section. Which one should be selected?
- Hollow pipe
- Equal angle iron
- Unequal angle iron
- T-section
- None of the above
Q15 | The diameter of corresponding Mohr circle will represent
- 80 MPa
- 50 MPa
- 30 MPa
- 20 MPa
- None of the above
Q16 | For a beam of length L fixed at one end, supported at the other and loaded W at the centre C the maximum bending moment with occur at
- Simply supported end
- Between supported end and centre
- Between fixed end and centre
- Centre
- Fixed end
Q17 | In SI units, one bar is equal to
- 0.1 N/mm2
- 1.0 N/mm2
- 1.0 N/cm2
- 10.0 N/m2
- None of the above
Q18 | The instrument used for the measurement of expansion and contraction due to change in temperature, is known as
- Dilatometer
- Bolometer
- Padometer
- Tellurometer
- None of the above
Q19 | A piece of steel plate is subjected to perpendicular stresses of 50 Mpa and 30 Mpa both tensile. The normal stress is
- 8.6 MPa
- 14.4 MPa
- 26.6 MPa
- 48.4 MPa
- None of the above
Q20 | In case of thin walled cylinders the ratio of hoop stress to maximum shear stress stress is
- 2
- 4
- None of the above
Q21 | Highest factor of safety is usually taken for
- dead
- live load
- shock load
- None of the above
Q22 | The bending moment diagram in case of a cantilever beam carrying a linearly varying load from zero at free end to maximum at supported end will be a
- Cubic parabola
- Inverse hyperbola
- Traingle
- Parabola
- Rectangle
Q23 | The ratio of stress produced by suddenly applied load to that produced by the same load when gradually applied is
- 4
- 1
- 2
- The maximum energy stored at elastic limit per unit volume.
Q24 | While evaluating the strength of riveted joint in shearing, bearing or tension the calculations are based on
- Actual size of rivet
- Actual size of hole drilled for the rivet
- Mean of the size of hole and drilled hole
- Smaller of the two holes
- None of the above
Q25 | The modulus of rigidity is defined as
- The ratio of true stress to true strain
- The ratio of shear stress to shear strain
- The ratio of longitudinal stress to longitudinal strain
- The ratio of twisting moment to cross-sectional area
- None of the above