Improving brake power of a diesel engine (other parameters constant) Which change will increase brake power output for a given engine configuration? Choose the correct option.
Mechanical Engineering
IC Engines and Nuclear Power Plants
Difficulty: Easy
Choose an option
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ADecrease the density of intake air
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BIncrease the temperature of intake air
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CIncrease the pressure of intake air
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DDecrease the pressure of intake air
Answer
Correct Answer: Increase the pressure of intake air
Explanation
ConceptBrake power rises with higher trapped air mass (more oxygen) enabling more fuel to burn. Supercharging or turbocharging raises intake pressure, increasing air density and mass flow per cycle.
Why others decrease powerLower density or lower pressure reduce air mass. Higher intake temperature lowers density at a given pressure, also reducing mass.
Final AnswerIncrease the pressure of intake air