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7. Give two reasons for the use of a guard on chain drives. 8. List three lubrication methods when dealing with chain drives. 9. Name two types of chain drives. 10. Sketch and illustrate the components of a roller-chain.
11. How should a chain drive that transmits high power at high speed be lubricated?
12. Briefly describe with the aid of sketches, the following: 12.1 shaſt alignment 12.2 sprocket mounting 12.3 chain mounting 12.4 chain tensioning.
13. Explain with the aid of a simple sketch, how to determine accurately the sag depth of a chain drive.
14. Illustrate the differences between the three types of sprockets and briefly explain in table, where each type is used.
15. Name and briefly discuss the factors to take in account before positioning an idler (jockey) sprocket.
16. Explain the purpose of effective lubrication on chain drives.