Frictional power in an engine is calculated as:

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RRB JE ME 22 Apr 2025 Shift 2 CBT 2 Official Paper
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  1. Indicated power − Brake power
  2. Brake power / Mechanical efficiency
  3. Indicated power + Brake power
  4. Indicated power × Mechanical efficiency

Answer (Detailed Solution Below)

Option 1 : Indicated power − Brake power
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Explanation:

Frictional Power:

  • Frictional power in an engine refers to the power loss due to friction within the engine components. This includes friction between the piston and cylinder walls, bearings, and other moving parts. It is the difference between the indicated power (the power generated within the engine cylinder) and the brake power (the usable power delivered by the engine).
  • When an engine operates, not all the power generated by the combustion process is converted into usable work. A portion of the power is lost due to friction between the moving components of the engine. The indicated power (I.P.) is the total power generated inside the engine cylinder without considering losses, while the brake power (B.P.) is the actual power delivered by the engine to perform useful work.
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