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Q6. The effort wheel of a worm and worm wheel chain block is 220 mm diameter, the worm is single start and the worm wheel has 45 teeth. The load wheel is 130 mm diameter. A load of 7 kN requires an effort of 180 N.

(a) Sketch the arrangement. (4)

(b) When lifting a load of 7 KN, calculate EACH of the following:

(i) the efficiency. (8)

(ii) the ideal effort. (2)

(iii) the effort required to overcome friction. (2)