Mechanical Engineering MCQs

In order to give a complete secondary balance of a multi-cylinder in-line engine,

by
the algebraic sum of the secondary forces must be equal to zero
the algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero
both (a) and (b)
none of these
✅ The correct answer is option C.

A castle nut is a locking device in which

by
a thinner nut is tightened down over a thicker or main nut and the main nut is tightened against the thinner nut by loosening
a slot is cut in line with the centre of each face and a split pin passes through two slots in the nut and a hole in the bolt, so that a positive lock is obtained unless the pin shears
a slot is cut about half way through the nut and a small screw is tightened between the nut and the bolt in order to produce more friction
the bottom cylindrical
✅ The correct answer is option B.