## Friday, 3 March 2017

### EXERCISES - Balancing Of Reciprocating masses

EXERCISES

1. Define Balancing? Write a short note on primary and secondary balancing?
2. Explain why only a part of the unbalanced force due to reciprocating masses is balanced by revolving mass.
3. Derive the following expressions, for an uncoupled two-cylinder locomotive engine:
(a) variation is tractive force  (b) Swaying couple; and (c) Hammer blow
4. Explain the method of balancing a number of masses rotating in one plane by another mass rotating in the same plane
5. What are in-line engines? How are they balanced? It is possible to balance them completely?
6. Explain the 'direct and reverse crank' method for determining unbalanced forces in radial engines.
7. Discuss the balancing of V-Engines.
8Explain the method of balancing a single rotating mass by another mass in same plane.
9. Five masses A,B,C,D and E Rotate in the same plane at equal radii. The masses A, B and C are 10 kg, 5 kg, and 8 kg respectively. The angular position of masses B, C, D and E measured in the same direction from A are 60°,  135°, 210° and 270° respectively. Find the masses D and E for complete balance.