141) A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², then the thickness of the metal required for making the pipe will be

142) A tangent key is provided in pairs at right angles and each key is to withstand torsion in one direction only.

143) When the speed of belt increases,

144) According to law of gearing, the common normal at the point of contact between a pair of teeth must always pass through the pitch point.

145) An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be interference between the