Question 377Motor Plants - Assistant Engineer

The correct answer is B) The inertia of the turbocharger rotor causes a time lag which delays the turbocharger speed increase. When an excessive additional load is applied too quickly to a turbocharged diesel engine, the turbocharger rotor's inertia causes a delay in the speed increase. This delay results in insufficient air supply to the engine, leading to incomplete combustion and the production of black smoke from the exhaust. The other options are incorrect because: A) Exhaust energy would not draw excess air, but rather insufficient air due to the turbocharger lag. C) Exhaust gas pumping losses are not the primary cause of the black smoke. D) Exhaust gas back pressure does not fall slightly, but rather remains insufficient due to the turbocharger lag.