Strength of Materials problems
- 1. A steel bar 2 m long, 20 mm wide and 10 mm thick is subjected to a pull of 2 kN. If the same bar is subjected to a push of 2 kN, the Poission's ratio of the bar in tension will be __________ the Poisson's ratio for the bar in compression.
Options- A. equal to
- B. less than
- C. greater than Discuss
Correct Answer: equal to
- 2. A thin cylindrical shell of diameter (d), length (l) and thickness (t)is subjected to an internal pressure (p). The hoop stress in the shell is
Options- A. pd/t
- B. pd/2t
- C. pd/4t
- D. pd/6t Discuss
Correct Answer: pd/2t
- 3. For biaxial stress, the planes of maximum shear are at right angles to each other and are inclined at 45° to the principal planes.
Options- A. True
- B. False Discuss
Correct Answer: True
- 4. When a body is subjected to a direct tensile stress (?) in one plane, then normal stress on an oblique section of the body inclined at an angle ? to the normal of the section is
Options- A. ? cos ?
- B. ? cos2 ?
- C. ? sin ?
- D. ? sin2 ? Discuss
Correct Answer: ? cos2 ?
- 5. In the above question, the ratio of stiffness of spring 'B' to spring 'A' will be
Options- A. 2
- B. 4
- C. 6
- D. 8 Discuss
Correct Answer: 8
- 6. In a tensile test, when the material is stressed beyond elastic limit, the tensile strain __________ as compared to the stress.
Options- A. decreases slowly
- B. increases slowly
- C. decreases more quickly
- D. increases more quickly Discuss
Correct Answer: increases more quickly
- 7. A pressure vessel is said to be a thick shell, when
Options- A. it is made of thick sheets
- B. the internal pressure is very high
- C. the ratio of wall thickness of the vessel to its diameter is less than 1/10.
- D. the ratio of wall thickness of the vessel to its diameter is greater than 1/10. Discuss
Correct Answer: the ratio of wall thickness of the vessel to its diameter is greater than 1/10.
- 8. The maximum bending moment of a simply supported beam of span l and carrying a point load W at the centre of beam, is
Options- A. Wl/4
- B. Wl/2
- C. Wl
- D. Wl2/4 Discuss
Correct Answer: Wl/4
- 9. Within elastic limit, shear stress is __________ shear strain.
Options- A. equal to
- B. less than
- C. directly proportional to
- D. inversely proportional to Discuss
Correct Answer: directly proportional to
- 10. The planes, which carry no shear stress, are known as principal planes.
Options- A. True
- B. False Discuss
Correct Answer: True
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