Where is the variable compression ratio used?(a) SI engine(b) CI engine(c) Wankel engine(d) HCCI engineI have been asked this question by my school principal while I was bunking the class.The doubt is from Nonconventional Engines in section Nonconventional Engines, Conventional Energy Sources & Cooling System of Automobile Engineering

Where is the variable compression ratio used?(a) SI engine(b) CI engin

1.	Where is the variable compression ratio used?(a) SI engine(b) CI engine(c) Wankel engine(d) HCCI engineI have been asked this question by my school principal while I was bunking the class.The doubt is from Nonconventional Engines in section Nonconventional Engines, Conventional Energy Sources & Cooling System of Automobile Engineering
Answer» Right option is (a) SI engine To elaborate: Variable compression is used in SI ENGINES. There are several methods for CHANGING both the GEOMETRIC and EFFECTIVE compression ratio.

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