Which of the following devices will increase the power output of a diesel engine without increasing its frictional load?

Correct Answer: Option B — Turbine-driven centrifugal blower

Turbine-driven centrifugal blowers extract energy from exhaust gases otherwise wasted, increasing charge air density and engine power without imposing mechanical parasitic drag on the crankshaft, unlike gear-driven or direct mechanical blowers that consume engine output to operate.