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This set of Strength of Materials Multiple Choice Questions & Answers (MCQs) focuses on Strength Of Materials Set 29
Q1 | The elongation of a conical bar under its own weight is equal to
- that of a prismatic bar of the same length
- one third that of a prismatic bar of the same length
- One fourth that of a prismatic bar of the same length
- one sixth that of a prismatic bar of the same length
- None of the above
Q2 | A propped cantilever is indeterminate externally to
- the second degree
- the third degree
- the fourth degree
- None of the above
- None of the above
Q3 | Secondary stresses may be set up in a frame due to any of the following reasons EXCEPT
- rigidity of the members
- ecentricity of connections
- self-weight of the members
- members not being straight
- None of the above
Q4 | Which of the following is dimensionless?
- Coefficient of linear expansion
- Thermal stress
- Strain
- Bulk modulus
- Shear stress
Q5 | Diamond riveting is generally used for
- Butt joints
- Lap joints
- Revised joints for dissimilar materials
- Riveted joints for materials of different thickness
- None of the above
Q6 | When a number of loads rest upon a beam, dflection at any point is equal to the sum of the deflections at the point due to each of the loads taken separately. This statement is known as
- Rankine's theorem
- Mohr's hypothesis
- Maxwell's theorem
- Castigliano's theorem
- None of the above
Q7 | The rate of change of bending moment is equal to
- Shear force
- Deflection
- Slope
- Poisson's ratio x deflection
- None of the above
Q8 | Shear stress on principal planes is
- maximum
- minimum
- zero
- None of the above
- None of the above
Q9 | The closed-coiled helical springs are made from the same small diameter wire, one wound on 2.5 cm diameter core and the other on 1.25 cm diameter core. If each spring has n coils, the ratio of their spring constants would be
- 1?2
- 1
- 1?8
- 1?4
- 1?16
Q10 | Two steel shaft each of length L and outside diameter D are subjected to uniform torsion. The first shaft is solid while the second one is hollow with inside diameter D/2. The ratio of the strain energies that these two shafts can absorb without exceeding a maximum allowable shear stress, would be
- 16?15
- 3?4
- 8?7
- 16?15
- 7?8
Q11 | A feinforced concrete beam is considered as made of
- Composite material
- Homogeneous material
- Clad material
- Hetrogeneous material
- Isotropic material
Q12 | The shear stress required to cause plastic deformation of solid metals is known as
- Flow stress
- Proof stress
- Rupture stress
- Ultimate stress
- None of the above
Q13 | Continuous beams are
- Stronger and much stiffer than simple beams
- Weaker and less stiffer than simple beams
- Subjected to excessive shear strain
- Withstanding double the maximum bending moment on simple beams
- None of the above
Q14 | The method of increasing fatigue resistance by over-stressing the metal by successively increasing loading is known as
- Coaxing
- Relaxing
- Compounding
- Bauschinger effect
- None of the above
Q15 | A continuous beam is one which is
- Infinitely long
- Supported at two points only
- Supported at more than two supports
- Fixed at the ends and simply supported at intermediate point
- None of the above
Q16 | A mild steel flat 3 m long 150 mm wide and 15 mm thick carries an axial tensile load of 150 kN. If the value of u for mild steel is 0.3, it can be concluded that
- length, width and thickness all will elongate
- length and width will increase but thickness will decrease
- length and thickness will increase but width will ecrease
- length will increase but width and thickness will decrease
- None of the above
Q17 | A cantilever beam rectangular in cross-section is subjected to a load W at its free end, causing deflection ?1. If the load is increased to 2W, causing deflwction ?2, the value of ?1/?1 would be
- 22
- 4
- Stress is proportional to strain at all section
- 1
Q18 | In a tensile test conducted on a ductile material, the ratio of the true stress to the engineering stress, is approximately
- 0.2
- 1.05
- 0.9
- 10
- None of the above
Q19 | In case of a circular shaft subjected to torque the value of shear stress
- Has maximum value at the axis
- Varies linearly from axis to surface
- Has maximum value at the surface
- Is uniform throughout
- Is zero at the axis and linearly increases to a maximum value at the surface of the shaft
Q20 | Temperature stresses are set up in a material when
- it is free to expand or contract
- it is first heated and then cooled
- it is first colled and then heated
- its expansion or contraction is restrained
- None of the above
Q21 | The effective length of a column effectively held in position and restrained in direction at both ends will be
- 2L
- 0.67 L
- L
- 1.5 L
- 0.85 L
Q22 | The average values of modulus of rigidity for Aluminium. Brass Copper, Nickel and Steel in desceading order are given by
- Aluminium, Nickle, Steel, Brass, Copper
- Steel, Nickle, Copper, Brass, Aluminium
- Aluminium, Brass, Copper, Nickel, Steel
- Aluminium, Copper, Nickel, Brass, Steel
- Brass, Copper, Aluminium, Nickel, Steel
Q23 | For punching a hole of 25 mm diameter in a plate 20 mm thick, if the shear stress of plate material is 30 kg/mm2, the force required would be
- 10,000 kg
- 18,850 kg
- 28,850 kg
- 47,123 kg
- None of the above
Q24 | A column that fails primarily due to direct stress is called
- Long column
- Weak column
- Short column
- Medium column
- None of the above
Q25 | A uniform steel rope 400 metres long is hung vertically. The weight of the steel is 7.8 gm/cm3 and D = 2100 kg/mm2. The ratio of elongation of first 150 metres to that of first 300 metres would be
- 1 ; 2
- 1 ; 4
- 2 ; 1
- 4 ; 1
- 16 ; 1