Which of the following joint classifications constitutes a permanent fastening method?
Show answer Hide answer
Answer: D. rivets
Explanation
Rivets constitute a permanent fastening method because disassembling the joint requires destroying or cutting the rivet body. The permanent nature of a riveted connection is achieved by permanently deforming the tail end of the rivet during installation. Once installed, the expanded head and deformed tail mechanically lock the plates together with zero possibility of simple unfastening. Fasteners are broadly categorized into permanent and non-permanent types based on whether separation destroys the fastening element. Rivets are cylindrical metal pins with a head formed on one end, driven into pre-drilled structural holes and headed over. Common permanent joining techniques include riveting, welding, and structural adhesive bonding used in heavy industrial fabrication.
Option A is incorrect because bolts are classified as non-permanent fasteners since they can be unthreaded without damage. Option B is wrong because keys are removable machine elements used to secure rotating gears and pulleys to shafts. Option C is incorrect because cotters are temporary wedges designed for quick assembly and disassembly in mechanical linkages.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. When two identical springs of individual stiffness K are connected in series, the equivalent system stiffness is________________?
Show answer Hide answer
Answer: B. K/2
When two springs are connected in series, the applied load passes fully through both components. The total displacement is the sum of the individual deflections experienced by each spring. Applying standard mechanics for...
Q2. The strap-type end on a steam engine connecting rod is fastened using_________________?
Show answer Hide answer
Answer: A. gib of cotter joint
Steam engine connecting rods often utilize strap-type ends to secure bearing brasses around crankpins. A gib and cotter joint assembly locks the strap securely onto the rod end while allowing precise adjustment. Tapered...
Q3. The machining characteristics and workability of steel alloys are enhanced by incorporating___________________?
Show answer Hide answer
Answer: A. sulphur, lead, phosphorous
Sulphur, lead, and phosphorous form discrete inclusions in steel that promote brittle chip breakage. These intentional alloy additions reduce friction between the cutting tool face and the workpiece. Improved chip fragme...
Q4. Following cold working operations, metallic components are usually subjected to what treatment for stress relief__________________?
Show answer Hide answer
Answer: D. annealing
Cold working deforms metal below its recrystallization temperature, leaving high internal residual stresses behind. Annealing heats the cold-worked metal to a specific elevated temperature for stress relief. This thermal...
Q5. A manometer instrument is utilized for the measurement of__________________?
Show answer Hide answer
Answer: A. pressure in pipes, channels etc
A manometer is a fluid-filled pressure measuring instrument utilizing liquid column heights to indicate pressure. It connects directly to industrial piping, fluid channels, or pressure vessels to determine internal fluid...
Q6. The valve actuation rod in a steam engine mechanism links to the eccentric rod through_________________?
Show answer Hide answer
Answer: C. kunckle joint
A knuckle joint connects two rods subjected to axial tension or compression forces. It permits relative angular rotation between the connected rods around a single hinge axis. This specific articulation accommodates the...