Strength of Materials MCQs Set-3

1. The bending moment diagram for a simply supported beam loaded in its centre is

2. A cantilever beam of square section is subjected to a load W at the free end. If the length of the beam is doubled and the load reduced to half the deflection at the free end compared to original deflection would be

3. A cantilever of length L carries a concentrated load w at the mid span. If the free end is supported on a rigid prop the reaction of the prop will be

4. The intensity of shear stress in a shaft subjected to torsion is maximum at

5. The most economical section of the shaft subjected to torsion is

6. Euler's formula for a mild steel long column hinged at both ends is not valid for slenderness ratio

7. Beams of uniform strength are better as compared to beams of uniform cross-section as they are economical

8. A long column has maximum crippling load when its

9. A continuous beam is one which is

10. The bending moment at the free end of a cantilever beam is

11. Rankine's formula for column is valid when slenderness ratio

12. The ratio of maximum shear stress to hoop stress in a thin cylindrical pressure vessel is

13. Slope and deflection at a point in a loaded cantilever beam carrying several loads can be found out by the

14. The nature of stress at the inside surface of a crane hook is

15. If the bending moment is consistent there will be no______________ stresses

16. In a uniform beam supported at one end in position, the maximum stress under self weight of bar shall occur at the

17. In a rectangular beam, the maximum shear stress occurs at

18. The principal stresses σ1, σ2 and σ3 at a point respectively are 80 MPa, 30 MPa and -40 MPa. The maximum shear stress is

19. In a cantilever, maximum deflection occurs, where

20. A beam of 6 m long, simply supported at its end is carrying a point load W at its mid span. If slope at the end is not to exceed 2°, then deflection at mid span will be

21. The intensity of stress which causes unit strain is called

22. Point of contraflexure in a cantilever of span l, carrying a uniform distributed load, w per metre occurs at

23. Bending moment at supports in case of simply supported beam is always

24. The bending moment diagram for a cantilever subjected to a couple M at free end will be

25. In a rectangular beam, when width, depth and length are doubled, the bending stress

26. A beam when subjected to an axial pull P

27. The shear stress at the centre of a circular shaft under torsion is

28. A steel beam of length 30 m is fixed between two supports at 8°C with no stress. Find the expansion allowances given if the stress in the bar is to be zero when temperature is raised to 50°C ( α= 12 ×10^-6 per °C, E = 2× 10^5 N/mm^2)

29. If load at the free end of the cantilever beam is gradually increased, failure will occur

30. The type of stresses setup in a rotating shaft due to torsion are

31. The bending moment on a section is maximum where shearing force is

32. Strength of the beam depends on

33. The bending moment for a certain portion of the beam is constant. For that section, shear force would be

34. A simply supported beam AB of span L carries two concentrated load W each at points L/3 from A and B. What is the shear force in the middle one third portion of beam.