In a worm geared pulley block, the effective diameter of the effort wheel is 250 mm. The
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In a worm geared pulley block, the effective diameter of the effort wheel is 250 mm. The worm is single threaded and the worm wheel has 100 teeth. The effective diameter of load drum fixed to it is 100 mm. If an effort of 200 N is required to lift a load of 12.5 kN, what is the efficiency of the block ?
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