Top Most Machine Design Objective Interview Questions

While designing a parallel sunk key it is assumed that the distribution of force along the length of the key

a) Varies linearly

b) is uniform throughout

c) varies exponentially, being more at the torque input end

d) varies exponentially, being less at torque output end

Answer: (c) Parallel sunk key.

Which sunk key made in the form of a segment of a circular disc of uniform thickness, known as?

a) Feather key

b) Kennedy key

c) Woodruff key

d) Saddle key

Answer: c) Woodruff Key

The piston rod and the crosshead in a steam engine are usually connected by means of

a) Cotter joint

b) Knuckle Joint

c) Ball Joint

d) Universal Joint

Answer: a) Cotter Joint

In the assembly of pulley, key and shaft

a) Pulley is made the weakest

b) Key is made the weakest

c) Key is made the strongest

d) All the three are designed for equal strength

Answer: b) Key is made the weakest so that it is cheap and easy to replace in case of failure

A spur gear transmitting power is connected to the shaft with a key of rectangular section. The type of stresses developed in the key is fare

a) Shear stress alone

b) Bearing stress alone

c) Both shear and bearing stresses

d) Shearing, Bearing and Bending stresses

Answer: c) Key develops both shear and bearing stresses

A cotter joint is used when no relative motion is permitted between the rods joined by the cotter. It is capable of transmitting

a) Twisting Moment

b) An axial tensile as well as compressive load

c) The bending moment

d) Only compressive axial load

Answer: b) An axial tensile as well as compressive load

A square key of side d/4 is to be fitted on a shaft of diameter d and in the hub of a pulley. If the material of the key and shaft is same and the two are to be equally strong in shear, what is the length of the key?

a) π d / 2

b) 2π d / 3

c) 3π d / 4

d) 4π d / 5

Answer: a) π d / 2

In a gib and cotter joint, the gib and cotter are subjected to

a) Single Shear only

b) Double Shear only

c) Single shear and crushing

d) Double shear and crushing

Answer: d) Double Shear and Crushing

A key connecting a Flange coupling to a shaft is likely to fail in

a) Shear

b) Tension

c) Torsion

d) Bending

Answer: a) Shear