Machine Design Flashcards
6 cards from real BME practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Machine Design flashcards as text
Which gear type is used to transmit motion between two parallel shafts?
Answer: Helical gear
Helical gears are commonly used to transmit power between parallel shafts, offering smoother and quieter operation than spur gears.
The Hertz contact stress formula is used to analyze failure in:
Answer: Rolling element bearings
Hertz contact stress theory is applied to rolling element bearings, gears, and cam-follower systems where curved surfaces make contact.
Which spring stores energy through torsion of its wire?
Answer: Helical compression spring
In a helical compression spring, the coil wire is primarily subjected to torsional stress as the spring deflects axially.
Goodman's criterion in fatigue design relates:
Answer: Mean stress and alternating stress to failure
Goodman's criterion provides a linear relationship between mean stress and alternating stress that defines the boundary between safe and unsafe fatigue conditions.
What is the function of a retaining ring (snap ring) in a shaft assembly?
Answer: Prevent axial movement of a component
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.
Stress concentration in a machine member is most influenced by:
Answer: Geometric discontinuities such as holes and notches
Geometric discontinuities like holes, fillets, notches, and keyways cause local stress intensification described by the stress concentration factor Kt.