BME Machine Design 2

Question 1

Which gear type is used to transmit motion between two parallel shafts?

Accepted Answer

Helical gear

Answer

Helical gears are commonly used to transmit power between parallel shafts, offering smoother and quieter operation than spur gears.

Question 2

The Hertz contact stress formula is used to analyze failure in:

Accepted Answer

Rolling element bearings

Answer

Hertz contact stress theory is applied to rolling element bearings, gears, and cam-follower systems where curved surfaces make contact.

Question 3

Which spring stores energy through torsion of its wire?

Accepted Answer

Helical compression spring

Answer

In a helical compression spring, the coil wire is primarily subjected to torsional stress as the spring deflects axially.

Question 4

Goodman's criterion in fatigue design relates:

Accepted Answer

Mean stress and alternating stress to failure

Answer

Goodman's criterion provides a linear relationship between mean stress and alternating stress that defines the boundary between safe and unsafe fatigue conditions.

Question 5

What is the function of a retaining ring (snap ring) in a shaft assembly?

Accepted Answer

Prevent axial movement of a component

Answer

A retaining ring fits into a groove on a shaft or in a bore to provide a removable shoulder that prevents axial displacement of components.

BME - Bachelor of Mechanical Engineering Practice Test

BME - Bachelor of Mechanical Engineering Practice Test

BME Machine Design 2