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Question

A key advantage of using a lubricating compound in thread sealing is that it:

This question was previously asked in
RRB NTPC 2025 Graduate Level CBT 1 Question Paper (25-Mar-2026) (Shift 3)
The correct answer is

Prevents galling and seizing of threads

Thread sealing is crucial in preventing leaks in joints, especially in plumbing and mechanical assemblies. A key advantage of using a lubricating compound in thread sealing is its ability to prevent galling and seizing of threads. Let's explore why this is the case and rule out the other options:

  1. Acts as a solvent for contaminants present: Lubricating compounds are not typically used to dissolve contaminants. Instead, their primary function is to provide a smooth, lubricated surface to enhance the mating process of threaded components.
  2. Prevents galling and seizing of threads: This is the correct answer. Galling occurs when materials are cold-welded together due to friction and pressure. A lubricating compound reduces this friction, allowing for easier assembly and disassembly of threaded parts without damaging them. By preventing wear and tear on the threads, it helps maintain the integrity of the joint.
  3. Improves thread strength significantly: While lubrication can help in the preservation of threads by reducing wear, it does not inherently improve the strength of the threads themselves. The strength is determined by the material properties and thread design.
  4. Accelerates the curing of sealant used: Lubricating compounds are different from curing agents. They do not speed up curing; instead, they provide a more uniform and easier application of sealants if used concurrently.

In conclusion, the most important advantage of using a lubricating compound in thread sealing is its ability to prevent galling and seizing, thereby ensuring the joint remains functional and can be easily adjusted or disassembled if needed.

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Similar Questions

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  2. An engineer selects an M8 screw for assembling two steel plates. Which value indicates the nominal diameter in the specification M8 x 1.25 x 40?

  3. What do you call the sloping surface connecting the crest and root of a thread?

  4. In a standard hand tap set used for internal threading, how can a plug (bottoming) tap be identified quickly?

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  6. What is the primary reason for ensuring the tap is aligned correctly with the hole when tapping?

  7. For ISO metric threads, the depth of thread (theoretical) is approximately:

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Important Questions from Screw Threads

  1. Taps are re-sharpened by grinding:

  2. A die is:

  3. Which of the following is NOT a type of common threaded fastener?

  4. Which of the following gauge is used to determine the pitch of a thread?

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