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Q: A simple machine will be self-locking, if its efficiency is:
  • A. Greater than 80%
  • B. less than 50%
  • C. less than 80%
  • D. Greater than 50%
Correct Answer: Option B - A simple lifting machine will be reversible or self-locking solely based on its efficiency. It can be shown that a lifting machine is reversible if its efficiency is greater than 50% and self-locking it its efficiency is less than 50%
B. A simple lifting machine will be reversible or self-locking solely based on its efficiency. It can be shown that a lifting machine is reversible if its efficiency is greater than 50% and self-locking it its efficiency is less than 50%

Explanations:

A simple lifting machine will be reversible or self-locking solely based on its efficiency. It can be shown that a lifting machine is reversible if its efficiency is greater than 50% and self-locking it its efficiency is less than 50%