BME Machine Design

Question 1

What is the primary purpose of a factor of safety in machine design?

Accepted Answer

To account for uncertainties in load, material, and geometry

Answer

The factor of safety accounts for uncertainties in applied loads, material properties, and geometric tolerances to prevent failure.

Question 2

Which type of stress is induced in a shaft subjected to twisting?

Accepted Answer

Shear stress

Answer

Twisting a shaft induces shear stress, distributed across the cross-section with maximum value at the outer surface.

Question 3

The endurance limit of a material is the stress below which:

Accepted Answer

The material can withstand infinite fatigue cycles

Answer

The endurance limit is the maximum cyclic stress amplitude at which a material can theoretically endure an infinite number of load cycles without fatigue failure.

Question 4

In a bolted joint under tensile load, which failure mode is checked first?

Accepted Answer

Tensile failure of the bolt shank

Answer

Tensile failure of the bolt shank is the most critical and commonly checked failure mode in bolted joints under direct tensile loading.

Question 5

What does the 'pitch' of a thread refer to?

Accepted Answer

Axial distance between adjacent thread crests

Answer

Pitch is defined as the axial distance measured from one thread crest to the next adjacent crest on the same helix.

BME - Bachelor of Mechanical Engineering Practice Test

BME - Bachelor of Mechanical Engineering Practice Test

BME Machine Design