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The ratio of indicated thermal efficiency to the air standard efficiency is called as:
  • a)
    Overall efficiency
  • b)
    Relative efficiency
  • c)
    Volumetric efficiency
  • d)
    Mechanical efficiency
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
The ratio of indicated thermal efficiency to the air standard efficie...
It is the ratio of thermal efficiency of the engine to the air standard cycle efficiency on which it works.
Volumetric Efficiency (ηV)
The film of oil completely separates the sliding surfaces. The ratio of the sliding surface ratio of the actual volume of air goes to the cylinder for the stroke or swept volume of the cylinder.
Mechanical Efficiency (nm)
It is the ratio of brake power to indicated power.
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Most Upvoted Answer
The ratio of indicated thermal efficiency to the air standard efficie...
The ratio of indicated thermal efficiency to the air standard efficiency is called as the Relative Efficiency.

Explanation:
- The indicated thermal efficiency is the ratio of the actual power produced by the engine to the energy supplied to it.
- The air standard efficiency is the maximum theoretical efficiency of an engine, assuming that the entire heat input is converted into work output, and there are no losses due to friction, heat transfer, etc.
- The relative efficiency is the ratio of the indicated thermal efficiency to the air standard efficiency, expressed as a percentage.
- It is a measure of how well the engine is actually converting the heat input into useful work, compared to the maximum theoretical efficiency.
- A higher relative efficiency indicates a more efficient engine, while a lower relative efficiency indicates that the engine is losing some of the energy input to various inefficiencies.

Therefore, the correct answer is option B, Relative Efficiency.
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The ratio of indicated thermal efficiency to the air standard efficiency is called as:a)Overall efficiencyb)Relative efficiencyc)Volumetric efficiencyd)Mechanical efficiencyCorrect answer is option 'B'. Can you explain this answer?
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