221) In a steam engine, the valve rod is connected to an eccentric rod by means of

222) In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called

223) Which of the following formula is used in designing a connecting rod ?

224) When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is

225) The lead angle of a worm is 22.5 Degree. Its helix angle will be