QnA : Mechanics

Some Questions and Answer of  'Mechanics' :

1. In v - belt drives , belt touches at sides only  .

2. The direction of friction force acting on a body which can slide on a fixed surface is opposite to the direction of motion .

3. The value of friction force is equal to the external force .

4. The frictional force between objects that are stationary is called statical friction .

5. The life of bearing is expressed in no of hour's .

6. In thrust bearing , the load acts along the axis of rotation .

7. The type of coupling used to join two shafts whose axes are neither in same stength line nor parallel but interest is universal coupling .

8. A particle acted upon by two forces is in equilibrium .then the angle between the two forces is equal to 180* .

9.In design of key , shaft and pulley ,key is made weaker .

10. Using lubricants on Engine parts is an example of reducing - friction .

11. The law of parallelogram of forces gives the resultant of two coplanar concurrent forces .

12. The ratio of ultimate stress and working stress is called factor of safety .

13. The ratio of lateral strain to the linear strain within elastic limit is known as -poission ratio .

14. Shear stress on mutually perpendicular planes are equal .

15. The property of material by virtue of which itcan be beaten or rolled into plates is called malleability .

16. If the shear force is zero along a section the bonding moment at that selection will be :

Either maximum or minimum .

17. Hooke's law holds good upto :

Limit of proportionality .

18. Strain is a dimension quantity less .

19. The bending moment on a section is maximum where shearing force is - Changing sign .