Machine Design

71. Other method of reducing shock load in the above case can be

1. to decrease length
2. to increase length
3. unaffected by length
4. other factors would decide same
5. none of the above.

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72. Pick up wrong statement. Fatigue strength can be increased by

1. cold working
2. shot peening
3. grinding and lapping surface
4. hot working
5. using gradual changes of section.

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73. Plastic flow in ductile materials

1. increases the seriousness of static load-ing stress concentration
2. lessens the seriousness of static loading stress concentration
3. has no effect on it
4. depends on other considerations
5. none of the above.

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74. Rankine's theory of failure is applicable for following type of materials

1. brittle
2. ductile
3. elastic
4. plastic
5. tough.

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75. Residual stress in materials

1. acts when external load is applied
2. becomes zero when external load is removed
3. is independent of external loads
4. is always harmful
5. is always beneficial.

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76. Resilience of a material is important, when it is subjected to

1. combined loading
2. fatigue
3. thermal stresses
4. wear and tear
5. shock loading.

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77. Resistance to fatigue of a material is measured by

1. Young's modulus
2. coefficient of elasticity
3. elastic limit
4. ultimate tensile strength
5. endurance limit.

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78. Rivets are generally specified by

1. thickness of plates to be riveted
2. length of rivet
3. diameter of head
4. nominal diameter
5. all of the above.

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79. Set screws are

1. similar to small size tap bolts except that a greater variety of shapes of heads are available
2. slotted for a screw driver and generally used with a nut
3. used to prevent relative motion between parts
4. similar to stud
5. none of the above.

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80. Shear stress theory is applicable for

1. ductile fnaterials
2. brittle materials
3. elastic materials
4. all of the above
5. none of the above.

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