Two Technicians Are Discussing VGT's (Variable-Geometry Turbochargers') Variable-Nozzle Opening

Two technicians are discussing VGT's (variable-geometry turbochargers') variable-nozzle opening. Technician A says when less exhaust gas flow takes place across the turbine, the turbine speed drops because exhaust backpressure increases. Technician B says that by varying the width of the nozzle opening with an actuator, the turbine speed power is adjusted to provide just enough energy to drive the compressor wheel at the desired boost level for any engine speed and load condition. Who is right?

A) A only"
B) B only"
C) Both A and B
D) Neither A nor B"

Correct Answer:

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