Machine Design MCQ with Answers

466) A jam nut is a locking device in which

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 portion is recessed to receive the tip of the locking set screw

Answer is:

a thinner nut is tightened down over a thicker or main nut and the main nut is tightened against the thinner nut by loosening

467) The difference between the upper limit and lower limit of a dimension is called

Answer is:

tolerance

Explanation:

Tolerance is defined as the difference between the maximum and the minimum sizes allowed in manufactured components.

The difference between the upper limit and lower limit of a dimension is called

468) The algebraic difference between the actual size and the corresponding basic size is called actual deviation.

Answer is:

Agree

469) The average shear stress in the hollow shaft is smaller than the average shear stress in the solid shaft.

Answer is:

Right

470) The diameter of knuckle pin in a knuckle joint is usually taken as (where d = Diameter of the rod)

Answer is: