28) Which one is the correct formula for speed ratio of pulley ? Where: D = Diameter of driver pulley d = Diameter of driven pulley N = Speed of driver pulley n = Speed of driven pulley

29) A main shaft is running at 250 rpm and machine spindle is to be driven directly from the main shaft to turn at 125 rpm. If the diameter of pulley fitted on machine spindle is 20 cm, what would be the diameter of pulley fitted on main shaft ?

30) Loose pulley is a pulley which

31) Fast pulley is a pulley which

32) Jockey pulley is that which