186) When there is a reduction in amplitude over every cycle of vibration, then the body is said to have

187) In full depth 14.5 Degree involute system, the smallest number of teeth in a pinion which meshes with rack without interference is

188) In a disc clutch, if there are n₁ number of discs on the driving shaft and n₂ number of discs on the driven shaft, then the number of pairs of contact surfaces will be

189) The effect of swaying couple in a locomotive is resisted by the side pressure between the flanges of the tyres of the wheel and the inside of the rails.

190) The Klein's diagram is useful to find