Subtopic: Measurement of force, stress, torque, speed, displacement and acceleration on machine elements – shafts, couplings, keys, bearings and knuckle joints
Question Statement:
A standard rectangular sunk key in farm machinery transmits torque between a shaft and hub. Under normal design, the key is designed against failure by:
Options:
(A) Shearing and crushing (bearing stress)
(B) Pure tension and buckling
(C) Bending and fatigue fatigue
(D) Torsional resonance
Answer Key:
A
Step-by-Step Solution & Explanation
A rectangular sunk key is subjected to shear stress along its horizontal pitch plane and compressive crushing along its vertical bearing contact faces.