4) Which one of the following is metric helical gear proportion for indexing movement ?

5) It is the angle between the pitch cone generator and the root surface of the tooth space. For which bevel gear element is this the definition ?

6) Which one of the following types of bevel gears is mainly used in automobile drives ?

7) '2.25 m' is given as proportion for straight teeth rack. For which element is this the proportion ?

8) To cut straight teeth rack if module (m) = 3 and number of teeth = 20, the length of rack will be