Osstion-1: Select most appropriate answers and write in table belkow 12 13 14 15

Question

Osstion-1: Select most appropriate answers and write in table belkow 12 13 14 15 16 17 18 19 20 10 1. The (a) elasticity (b) endurance (c) strength (d) toughness (e) resilience property of a material which enables it to resist fracture due to high impact loads is known as 2. Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to (a) dynamic loading (b) static loading (c) combined static and dynamic loading (d) completely reversed loading 3. Spring stiffness is (a) ratio of coil diameter to wire diameter (b) load required to produce unit deflection (c) its capability of storing energy (d) its ability to absorb shocks 4. Stress concentration in cyclic loading is more serious in (a) ductile materials (b) brittle materials (c) equally serious in both cases (d) depends on other factors 5. The designation M 33 x 2 of a bolt means (a) metric threads of 33 turns in 2 m (b) metric threads with cross-section of 33 mm and 2mm length (c) metric threads of 33 mm outside diameter and 2 mm pitch (d) bolt of 33 mm nominal diameter having 2 threads per mm 6. When a helical spring is in tension, its wire is subjected to (a) tensiorn (b) shear (c) compression (d) all of the above 7number of cycles, for most of steel materials represent infinite fatigue life. (a) 10 b) 10 (c) 103 (d) none of the above.

Explanation / Answer

1. The property of material that enables it to sustain impact load is called toughness.

2. Endurance limit is the maximum stress that a member can withstand for infinite number of cycles without failure when subjected to completely reversed loading.

3. Spring stiffness is the load required to produce unit deflection.

4. Stress concentration in cyclic loading is more serious in ductile material.

5. M33x2 implies 33 mm nominal diameter and 2 mm pitch.

6. In case of helical spring, external load produces torsional shear stress .

7. 10^6 number of cycles.

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