A jam nut functions as a locking mechanism characterized by the fact that _____________________?
Show answer Hide answer
Answer: A. one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
Explanation
A jam nut locks by tightening a smaller nut against the main fastening nut. The main nut is then loosened slightly against the smaller one to create thread jamming friction. This relative wedging action prevents the threaded assembly from loosening under vibration. Threaded fasteners can vibrate loose during machine operation unless secured by locking devices. Jam nuts represent a traditional mechanical locking method used in heavy machinery assemblies. Frictional resistance between opposing thread flanks keeps the fastener securely in place.
Vibration-heavy machinery like stone crushers and compressors utilize jam nuts to maintain tension. Agricultural equipment relies on secure threaded connections to withstand constant field shaking. Maintenance engineers choose mechanical locking nuts when thread security is critical for safety. Slotted nuts locked with cotter pins use a physical barrier rather than thread jamming friction. Nuts featuring nylon inserts rely on polymer friction grip rather than dual nut jamming. Castle nuts use split pins through slots, differing entirely from the dual jam nut method.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. To safely accommodate thermal expansion and contraction in a tube assembly, it ought to be______________?
Show answer Hide answer
Answer: D. bent
Thermal expansion and contraction cause rigid pipelines and tube assemblies to change length significantly with temperature. Incorporating engineered bends or expansion loops provides mechanical flexibility to absorb the...
Q2. An alternative technique for minimizing impact loads under the previously mentioned conditions can be_________________?
Show answer Hide answer
Answer: B. to increase length
Increasing the overall length of a stressed member enhances its total elastic resilience and energy storage capacity. A longer fastener stretches more under impact loads, lowering peak shock stress levels transmitted to...
Q3. If a bolt is manufactured with left-handed threads, the corresponding nut must feature_____________________?
Show answer Hide answer
Answer: B. left hand with same pitch
Left-handed threaded bolts require a matching nut featuring identical left-handed internal threads. The thread pitch of both components must match perfectly to allow smooth assembly engagement. Mating right-hand threads...
Q4. The resilience characteristic of a material becomes critical when it undergoes________________?
Show answer Hide answer
Answer: E. shock loading
Shock loading involves sudden, high-magnitude impacts that deliver large amounts of kinetic energy instantly. Resilience measures the capacity of a material to absorb energy elastically and recover fully upon unloading....
Q5. Rankine's theory of failure is appropriately applied to which of the following material types___________________?
Show answer Hide answer
Answer: A. brittle
Brittle materials fail primarily by sudden cleavage fracture rather than plastic yielding. Rankine theory assumes failure occurs when maximum normal stress reaches ultimate limit. Ductile materials deform extensively bef...
Q6. The maximum shear stress failure theory is suitable for____________________?
Show answer Hide answer
Answer: A. ductile fnaterials
The maximum shear stress theory successfully predicts yielding behavior in ductile metal components. Ductile materials undergo plastic deformation primarily due to the action of shear stresses. Comparing maximum shear st...