Which is a case of useful friction?

  1. Rings in the piston
  2. Gears in rear axle
  3. Brake linings
  4. Crank shaft bearing

Answer (Detailed Solution Below)

Option 3 : Brake linings
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Detailed Solution

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In most of the cases in engine, friction is not desirable. But while applying brakes, this friction is most useful. The vehicle is stopped by friction of the brake liners. In other options, less friction will be desirable.

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