What are Variable Geometry Turbochargers (VGTs) also known as?

• Variable nozzle turbochargers (VNTs)

• Fixed geometry turbochargers

• Wastegate turbochargers

• Series turbochargers

What is the primary purpose of VGTs?

• To increase fuel consumption

• To improve power output and reduce emissions

• To increase engine noise

• To reduce vehicle weight

What is the purpose of EGR systems in engines post-2002?

• To increase fuel efficiency

• To reduce NOx emissions

• To increase engine power

• To reduce engine noise

What is the main advantage of electronically controlled VGTs?

• They are cheaper

• They are easier to install

• They reduce turbo lag

• They increase engine noise

What is the main function of series turbocharging?

• To replace VGTs

• To act as an alternative to VGTs

• To increase engine noise

• To reduce vehicle weight

How can VGTs be electronically controlled?

• To provide backpressure to enable EGR systems to operate

• To increase fuel efficiency

• To reduce engine noise

• To improve vehicle aerodynamics

What do newer VGTs feature as part of the vehicle data network?

• Smart actuators

• Manual levers

• Hydraulic pumps

• Mechanical springs

What type of sensor is included in the actuator to provide closed loop feedback?

• Hall effect position sensor

• Temperature sensor

• Pressure sensor

• Speed sensor

Why is extra cooling of VGTs necessary?

• To keep the actuators and mechanisms working properly

• To increase fuel efficiency

• To reduce noise

• To improve exhaust emissions

What are major problems for VGTs that can prevent full movement of vanes or nozzle rings?

• Seized or binding actuators

• Low oil pressure

• High fuel consumption

• Excessive noise