Strength of Materials

61. The safe twisting moment for a compound shaft is equal to the

1. maximum calculated value
2. minimum calculated value
3. mean value
4. extreme value
5. none of the above.

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62. The strain energy stored in a body due to suddenly applied load compared to when it is applied gradually is

1. same
2. twice
3. four times
4. eight times
5. half.

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63. The stress at which extension of the material takes place more quickly as compared to the increase in load is called

1. elastic point of the material
2. plastic point of the material
3. breaking point of the material
4. yielding point of the material
5. ultimate point of the material.

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64. The stress developed in a material at breaking point in extension is called

1. breaking stress
2. fracture stress
3. yield point stress
4. ultimate tensile stress
5. proof stress.

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65. The stress induced in a body due to suddenly applied load compared to when it is applied gradually is

1. same
2. half
3. two times
4. four times
5. none of the above.

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66. The stress necessary to initiate yielding is

1. considerably greater than that necessary to continue it
2. considerably lesser than that necessary to continue it
3. greater than that necessary to stop it
4. lesser than that necessary to stop it
5. equal to that necessary to stop it.

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67. The torsional rigidity of a shaft is expressed by the

1. maximum torque it can transmit
2. number of cycles it undergoes before failure
3. elastic limit up to which it resists torsion, shear and bending stresses
4. torque required to produce a twist of one radian per unit length of shaft
5. maximum power it can transmit at highest possible-speed.

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68. The total elongation produced in a bar of uniform section hanging vertically downwards due to its own weight is equal to that produced by a weight

1. of same magnitude as that of bar and applied at the lower end
2. half the weight of bar applied at lower end
3. half of the square of weight of bar applied at lower end
4. one-fourth of weight of bar applied at lower end
5. none of the above.

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69. The total strain energy stored in a body is termed as

1. resilience
2. proof resilience
3. modulus of resilience
4. toughness
5. impact energy.

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70. The ultimate tensile stress of mild steel compared to ultimate compressive stress is

1. same
2. more
3. less
4. more or less depending on other factors
5. unpredictable.

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