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Which type of turbochargers use moveable vanes to adjust air-flow?

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Which type of turbochargers use moveable vanes to adjust air-flow?

(a) Variable compressor

(b) Variable- geometry

(c) Variable-nozzle

(d) Variable-nozzle or Variable-geometry

I had been asked this question during an interview.

My question is based upon Petrol Engine Fuel Supply System in section Exhaust System & Petrol Engine Fuel Supply System of Automotive Engine Design

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Correct choice is (d) Variable-nozzle or Variable-geometry

For explanation I would say: Variable-geometry or variable-nozzle turbochargers use moveable vanes to adjust the air-flow to the turbine, imitating a turbocharger of the optimal size throughout the power curve.

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