Spark plugs are used in which of the following?
-
Diesel engine
-
Petrol engine
-
Both
-
none
B
Correct answer
Explanation
Spark plugs are used in petrol (gasoline) engines to ignite the air-fuel mixture. Diesel engines use compression ignition, where fuel ignites solely from the heat of compressed air, requiring no spark plugs. The 'Both' option is incorrect because diesel engines fundamentally do not use spark ignition systems.