Govt. Exams
Entrance Exams
The differential uses an epicyclic gear arrangement to allow the drive wheels to rotate at different speeds during cornering while maintaining equal torque distribution during straight-line acceleration.
Maximum shear stress theory (or von Mises equivalent) is most appropriate for ductile materials under combined loading as it accurately predicts failure based on distortion energy.
As helix angle increases, axial thrust component increases significantly. Limiting it to less than 45° keeps axial forces manageable and prevents excessive bearing loads and gear dimensions.
Brake pads must maintain stable friction coefficient across varying temperatures and offer excellent wear resistance to provide consistent and safe braking performance throughout their service life.
Increasing pulley diameter would actually increase the belt length and tension, reducing slipping tendency. All other options reduce the friction coefficient or normal force, causing slipping.
Shot peening creates compressive residual stresses at the surface, which significantly improve fatigue strength by preventing crack initiation and propagation from the surface.
Belt width in flat belt drives is primarily determined by the power transmission requirement and the belt speed. Higher power requires wider belts, while higher speeds may require adjustments.
Flexible couplings with elastomeric elements can accommodate angular, axial, and parallel misalignments while damping vibration, making them ideal for motor-pump assemblies with expected misalignment.
A contact ratio of 1.4 means that on average 1.4 teeth are in mesh. Typically, one tooth carries the load while occasionally two teeth share the load briefly, ensuring smooth transmission.
Cast iron's excellent damping capacity and reasonable fatigue strength make it ideal for machine beds subjected to fluctuating loads. Its ability to absorb vibration is a key advantage for structural components.
