Theory of Machines MCQ with Answers

156) A backing ring is used inside the pipe joint when making a

Answer is:

butt weld

157) The shear plane in case of bolts should

Answer is:

never be across the threaded portion

158) Castle nut is a locking device in which

one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

a slot is cut partly is middle of nut and then slot reduced by tightening a screw

a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end

Answer is:

through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end

Theory of Machines MCQ with Answers

156) A backing ring is used inside the pipe joint when making a

butt weld

157) The shear plane in case of bolts should

never be across the threaded portion

158) Castle nut is a locking device in which

through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end

159) When a nut is tightened by placing a washer below it, the bolt will be subjected to following type of loads

tension

160) Gear box is used

to obtain variable speeds