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For the same compression ratio, the efficiency of a dual combustion cycle is-

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  1. Less than Diesel cycle efficiency
  2. Less than Diesel cycle and greater than Otto cycle efficiency
  3. Less than Otto cycle and greater than Diesel cycle efficiency
  4. Greater than Otto cycle efficiency

Answer (Detailed Solution Below)

Option 3 : Less than Otto cycle and greater than Diesel cycle efficiency
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Detailed Solution

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Concept:

Since all the cycles reject their heat at the same specific volume, process line from state 4 to 1, the quantity of heat rejected from each cycle is represented by the appropriate area under the line 4 to 1 on the T-s diagram.

As is evident from the equation

The cycle which has the least heat rejected will have the highest efficiency.

Thus, the Otto cycle is the most efficient and the Diesel cycle is the least efficient of the three cycles.

For the Same Compression Ratio and the Same Heat Input

For Constant Maximum Pressure and Heat Supplied

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Q1.In an ideal four-stroke petrol engine, the assumption made about the burning process during the power stroke i.e. after compression is:
Q2.An engine is assumed to be working on ideal Otto cycle with the temperatures at the beginning and end of compression as 27 °C and 327 °C. The air-standard efficiency of the engine is:
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More Internal Combustion Engine Questions

Q1.In an ideal four-stroke petrol engine, the assumption made about the burning process during the power stroke i.e. after compression is:
Q2.An engine is assumed to be working on ideal Otto cycle with the temperatures at the beginning and end of compression as 27 °C and 327 °C. The air-standard efficiency of the engine is:
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