Review Questions

REVIEW QUESTIONS

1. State the reasons for velocity and acceleration analysis.

2. What is the importance of finding acceleration of various points in a mechanism? Name the two difference methods of finding acceleration in a mechanism.

3. State the properties of relative velocities of points on kinematic links.

4. What are the various methods used for finding out velocity of mechanism? Explain one of them.

5. How will you find the linear velocity of a point situated on a rotating body?

6. Explain how the velocity and acceleration in four-bar mechanism are calculated by relative velocity method.

7. Explain how the velocities of a slider and the connecting rod are obtained in a slider- crank mechanism.

[Hint: Refer Section 2.7]

[A.U., Nov/Dec 2006; May/June 2007]

8. Define rubbing velocity at a pin joint. What will be the rubbing velocity at pin joint when the two links move in the same and opposite directions.

9. Draw the acceleration diagram of a slider-crank mechanism. Explain.

[Hint: Refer Section 2.12]

[A.U., May/June 2007]

10. What is meant by coincident points in mechanisms? State their significance.

11. What do you by Coriolis component of acceleration? When it will exist? mean

12. Derive an expression for the magnitude of Coriolis component of acceleration. [Hint: Refer Section 2.14.2]

[A.U., May/June 2007]

13. How will you determine the magnitude and direction of Coriolis acceleration vector?

14. Explain the following terms: (a) Instantaneous centre; (b) Body centrode and Space centrode; (c) Axode.

15. How would you locate the instantaneous centre of a rigid link moving with combined motion of translation and rotation?

16. Compare instantaneous cepter method and velocity polygon method for velocity analysis of mechanisms.

17. State and prove the Kennedy's theorem of three instantaneous centres.

18. Briefly explain the term 'Angular velocity theorem".

19. Derive the expressions for the velocity and acceleration of the piston of a reciprocating engine mechanism.