Question 490Motor Plants - Assistant Engineer

The correct answer is B) the engine is cold. When a diesel engine is cold, it will produce white smoke from the exhaust. This is because the engine has not yet reached its normal operating temperature, which results in incomplete combustion of the fuel. The unburnt fuel then appears as white smoke coming from the exhaust. The other answer choices are incorrect. A) overloading the engine would typically produce black smoke, C) too much lube oil would result in blue/gray smoke, and D) a fouled turbocharger would not necessarily cause white smoke on its own.