A simple machine will be self-locking, if its efficiency is:

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JKSSB JE CE 2021 Official Paper Shift 2 (Held on 27 Oct 2021)
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  1. Greater than 80%
  2. less than 50%
  3. less than 80%
  4. Greater than 50%

Answer (Detailed Solution Below)

Option 2 : less than 50%
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Detailed Solution

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Explanation: 

If the removal of effort while lifting, results in lowering of the load, the machine is said to be reversible.

The machine is said to be self-locking if the load is not lowered on the removal of the effort.

Important Points

A lifting machine is reversible if its efficiency is greater than 50 per cent and self-locking if its efficiency is less than 50 per cent.

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