Question 386Motor Plants - Assistant Engineer

The correct answer is C) Pulse pressure. The pulse pressure turbocharging system operates with the least average back pressure in the exhaust manifold compared to the other options. This is because the pulse pressure system uses the pulsating nature of the exhaust gas flow to drive the turbocharger, rather than maintaining a constant pressure like the constant pressure system or requiring the turbocharger to extract a constant volume of exhaust gas like the constant volume system. The pulsating nature of the exhaust flow in the pulse pressure system results in lower average back pressure in the exhaust manifold, making it the most efficient option among the choices provided. The other options, such as constant volume and radial flow, are less efficient in terms of exhaust manifold back pressure compared to the pulse pressure system.