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
What is the primary purpose of a factor of safety in machine design?
Answer: To account for uncertainties in load, material, and geometry
The factor of safety accounts for uncertainties in applied loads, material properties, and geometric tolerances to prevent failure.
Which type of stress is induced in a shaft subjected to twisting?
Answer: Shear stress
Twisting a shaft induces shear stress, distributed across the cross-section with maximum value at the outer surface.
The endurance limit of a material is the stress below which:
Answer: The material can withstand infinite fatigue cycles
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.
In a bolted joint under tensile load, which failure mode is checked first?
Answer: Tensile failure of the bolt shank
Tensile failure of the bolt shank is the most critical and commonly checked failure mode in bolted joints under direct tensile loading.
What does the 'pitch' of a thread refer to?
Answer: Axial distance between adjacent thread crests
Pitch is defined as the axial distance measured from one thread crest to the next adjacent crest on the same helix.
A key connecting a gear to a shaft primarily transmits:
Answer: Torque
A key is a machine element that fits into keyways on both the shaft and hub to transmit torque between them.