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A diesel engine is usually more efficient than a spark ignition engine because
  • a)
    diesel being a heavier hydrocarbon, releases more heat per kg than gasoline
  • b)
    the air standard efficiency of diesel cycle is higher than the Otto cycle, at a fixed compression ratio
  • c)
    the compression ratio of a diesel engine is higher than that of an SI engine
  • d)
    self ignition temperature of diesel is higher than that of gasoline
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A diesel engine is usually more efficient than a spark ignition engine...
For same compression ratio and the same heat supplied, Otto cycle is most efficient and diesel cycle is least efficient.
In practice, however, the compression ratio of the Diesel engine ranges between 14 and 25 whereas that of the Otto engine between 6 and 12. Due to higher compression ratio diesel engine is more efficient than petrol.
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A diesel engine is usually more efficient than a spark ignition engine becausea)diesel being a heavier hydrocarbon, releases more heat per kg than gasolineb)the air standard efficiency of diesel cycle is higher than the Otto cycle, at a fixed compression ratioc)the compression ratio of a diesel engine is higher than that of an SI engined)self ignition temperature of diesel is higher than that of gasolineCorrect answer is option 'C'. Can you explain this answer?
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A diesel engine is usually more efficient than a spark ignition engine becausea)diesel being a heavier hydrocarbon, releases more heat per kg than gasolineb)the air standard efficiency of diesel cycle is higher than the Otto cycle, at a fixed compression ratioc)the compression ratio of a diesel engine is higher than that of an SI engined)self ignition temperature of diesel is higher than that of gasolineCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about A diesel engine is usually more efficient than a spark ignition engine becausea)diesel being a heavier hydrocarbon, releases more heat per kg than gasolineb)the air standard efficiency of diesel cycle is higher than the Otto cycle, at a fixed compression ratioc)the compression ratio of a diesel engine is higher than that of an SI engined)self ignition temperature of diesel is higher than that of gasolineCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A diesel engine is usually more efficient than a spark ignition engine becausea)diesel being a heavier hydrocarbon, releases more heat per kg than gasolineb)the air standard efficiency of diesel cycle is higher than the Otto cycle, at a fixed compression ratioc)the compression ratio of a diesel engine is higher than that of an SI engined)self ignition temperature of diesel is higher than that of gasolineCorrect answer is option 'C'. Can you explain this answer?.
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