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WorksheetsDSL-202 Chapter 30 Variable Geometry and Series Turbochargers
Total questions: 20
Worksheet time: 10mins
Exhaust gas backpressure can reach __________ to overcome intake air pressure.
60 psi
80 n/m
80 psi
70 psi
Which of the following statements is correct about variable geometry turbochargers?
A VGT turbocharger is capable of changing boost pressure independently of engine speed and load.
A VGT turbocharger is capable of changing boost pressure independently of only engine speed
Both A and B
Neither A nor B
Technician A says that the primary purpose of using VGTs is to provide maximum boost pressure. Technician B says that the primary purpose of using VGTs has to do with the operation of exhaust gas recirculation (EGR) systems. Who is correct?
Technician A
Technician B
Both Technician A and Technician B
Neither Technician A nor Technician B
The primary purpose for using VGTs has to do with the operation of ___________________systems.
Exhaust gas recirculation (EGR)
Intercooler (IC)
Intercooler (IC)
Hydraulic electronic unit injector (HEUI)
In diesel engines with EGR systems up to _____ of the intake charge can be exhaust gas.
40%
50%
60%
30%
Which of the following statements is correct with regard to the turbo speed sensor?
If overspeed is detected, the ECM will open the vanes in the VGT to slow turbine speed.
The HD-ODB system monitors the turbo operation using the speed sensor
Both A and B
Neither A nor B
Technician A says that if overspeed is detected, the ECM will close the vanes in a VGT to slow the turbine. Technician B says that a turbo speed sensor is the equivalent of a wastegate on a turbocharger. Who is correct?
Technician A
Technician B
Both Technician A and Technician B
Neither Technician A nor Technician B
Technician A says closing the nozzle to narrow its width decreases turbine speed and boost pressure as exhaust backpressure drops. Technician B says that closing the nozzle to narrow its width rapidly increases turbine speed and boost pressure as exhaust backpressure rises. Who is correct?
Technician A
Technician B
Both Technician A and Technician B
Neither Technician A nor Technician B
The nozzle ring actuation is controlled by __________.
The ECM
The intake sensing hose
A spool valve
Exhaust energy/pressure
EGR gas flow does not need to accompany __________.
Low load conditions
Low boost pressure conditions
High boost pressure conditions
None of these is correct.
Turbocharger surging creates a condition called __________.
Chocking
Chaffing
Clacking
Chuffing
Which of the following statements is correct about actuator voltage checks?
Observe battery voltage when the ignition key is switched off. If battery voltage occurs, the actuator is defective.
Observe battery voltage when the ignition key is switched on. If battery voltage occurs, the actuator is defective.
Both A and B
Neither A nor B
During an operational test of actuation of VGT operation, a technician could view __________ changes in relation to vain position.
Engine RPM
Boost pressure
Intake restriction
Exhaust back pressure
Technician A says that VPOD regulates air pressure to the turbocharger actuator. Technician B says that VPOD stands for Variable Pressure Output Device. Who is correct?
Technician A
Technician B
Both Technician A and Technician B
Neither Technician A nor Technician B
Seized or binding actuators are major problems for VGTs ._______ in the vane of sliding nozzle can prevent proper VGT operation
Heat
Oil coking
Soot
Wrong software installed
A wastegated series high-pressure turbocharger directs exhaust energy to the __________.
Atmosphere
High pressure turbine
Low-pressure turbo
CAC
Which stroke can be increased to adjust the duration of the compression stroke?
Overlap
Intake
Power
Exhaust
SSTs use __________.
Two compressor wheels
Two turbine wheels
Two compressed air outlets
Two exhaust outlets
Which of the following statements is correct with regard to series connected turbochargers?
Series turbochargers are connected one to each bank on a V-type diesel engine
Series connected turbochargers can overcome the limitations of single stage and variable geometry turbocharger.
Both A and B
Neither A nor B
CAC may be cooled by __________.
Air
Liquid
Both A and B
None of these is correct.
