In practice, the compression ratio of compression-ignition (CI) engine ranges from ______________________?
Correct answer: C. 15 to 25
- A. 40 to 55
- B. 5 to 10
- C. 15 to 25
- D. 60 to 70
Explanation
CI engines use high compression ratios so that the air temperature rises sufficiently to ignite the injected fuel. Their usual compression ratio is approximately 15 to 25, much higher than that of spark-ignition engines.
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