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Consider the following statements regarding Otto cycle:
1. It is not a reversible cycle.
2. Its efficiency can be improved by using a working fluid of higher value ofratio of specific heats.
3. The practical way of increasing its efficiency is to increase the compressionratio.
4. Carburetted gasoline engines working on Otto cycle can work withcompression ratios more than
Of these statements 
  • a)
    1, 3 and 4 are correct
  • b)
    1, 2 and 3 are correct
  • c)
    1, 2 and 4 are correct
  • d)
    2, 3 and 4 are correct
Correct answer is option 'D'. Can you explain this answer?
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Consider the following statements regarding Otto cycle:1. It is not a ...
Ans. (d)
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Consider the following statements regarding Otto cycle:1. It is not a ...
Otto cycle is a thermodynamic cycle that describes the functioning of spark ignition engines. It consists of four processes - isentropic compression, constant volume heat addition, isentropic expansion, and constant volume heat rejection. Let's analyze the given statements regarding the Otto cycle.

1. It is not a reversible cycle.
The statement is correct. Otto cycle is an irreversible cycle as there is heat transfer during the constant volume heat addition and rejection processes. In a reversible cycle, there should be no heat transfer.

2. Its efficiency can be improved by using a working fluid of higher value of ratio of specific heats.
The statement is correct. The efficiency of the Otto cycle is dependent on the working fluid's properties. The ratio of specific heats (γ) of the working fluid plays a crucial role in determining the efficiency. Increasing the value of γ can improve the efficiency of the cycle.

3. The practical way of increasing its efficiency is to increase the compression ratio.
The statement is correct. The compression ratio is the ratio of the volume of the cylinder when the piston is at the bottom of the stroke to the volume when it is at the top of the stroke. Increasing the compression ratio can increase the temperature and pressure of the working fluid at the beginning of the constant volume heat addition process, which can improve the efficiency.

4. Carburetted gasoline engines working on Otto cycle can work with compression ratios more than.
The statement is incomplete, and the correct option is not given. It should be "more than what?" However, it is generally true that carbureted gasoline engines working on the Otto cycle can work with compression ratios more than 10:1.

In conclusion, options 2, 3, and 4 are correct, and option 1 is correct. Therefore, the correct answer is option D.
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Consider the following statements regarding Otto cycle:1. It is not a ...
Answer d
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Consider the following statements regarding Otto cycle:1. It is not a reversible cycle.2. Its efficiency can be improved by using a working fluid of higher value ofratio of specific heats.3. The practical way of increasing its efficiency is to increase the compressionratio.4. Carburetted gasoline engines working on Otto cycle can work withcompression ratios more thanOf these statementsa)1, 3 and 4 are correctb)1, 2 and 3 are correctc)1, 2 and 4 are correctd)2, 3 and 4 are correctCorrect answer is option 'D'. Can you explain this answer?
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