Discussion
Self ignition or compression ignition engine are termed as?
Answer: B
A compression ignition engine is a diesel engine.
In a diesel engine only air is drawn in and compressed to a high ratio, about 14:1 to 22:1, which heats it above the self-ignition temperature of the fuel. Diesel injected into this hot air ignites by itself, without a spark, hence 'self ignition' or compression ignition (CI). Farm tractors almost all use CI engines.
A petrol engine is a spark ignition (SI) engine: the air-fuel mixture is ignited by a spark plug. A steam engine is an external combustion engine and has no ignition in the cylinder at all.
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