Mechanical efficiency is the ratio of __________

  1. Work output to fuel energy burnt in the engine
  2. Power delivered to power available in the engine
  3. Air fuel mixture drawn in the cylinder to the volume of the cylinder
  4. Power available in the engine to power delivered

Answer (Detailed Solution Below)

Option 2 : Power delivered to power available in the engine
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Mechanical Efficiency: It is the ratio of power delivered (BHP) to the power available in the engine (IHP). It is expressed in percentage

Mechanical efficiency \( = \frac{{BHP}}{{IHP}} \times 100\)

Volumetric Efficiency: It is the ratio between the air drawn in the cylinder during the suction stroke and the volume of the cylinder

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