Question 1

The SIDI high pressure fuel pump uses a single-barrel piston plunger that is driven by a(n) ________.

Accepted Answer

A)  three-lobed cam 
B)  electric motor 
C)  single flat sided cam 
D)  square-lobed cam 
A)  three-lobed cam 
B)  electric motor 
C)  single flat sided cam 
D)  square-lobed cam A

Question 2

An engine equipped with GDI may have up to a ________ percent improvement in fuel economy.

Accepted Answer

A)  25 
B)  6 
C)  50 
D)  10 
A)  25 
B)  6 
C)  50 
D)  10 A

Question 3

Some engines that use a GDI system have carbon issues ________.

Accepted Answer

A)  on the fuel injectors 
B)  on the intake valves 
C)  on the exhaust valves 
D)  Both A and C 
A)  on the fuel injectors 
B)  on the intake valves 
C)  on the exhaust valves 
D)  Both A and C D

Question 4

When the fuel pressure regulator is deactivated, the fuel pressure defaults to ________.

Accepted Answer

A)  high pressure mode 
B)  60 PSI 
C)  low pressure mode 
D)  acceleration mode 
A)  high pressure mode 
B)  60 PSI 
C)  low pressure mode 
D)  acceleration mode

Question 5

What GDI operating mode is used to burn sulfur from the NOx catalyst?

Accepted Answer

A)  Stratified heating mode 
B)  Homogeneous stratified mode 
C)  Stratified mode 
D)  None of these 
A)  Stratified heating mode 
B)  Homogeneous stratified mode 
C)  Stratified mode 
D)  None of these

Question 6

GDI fuel injectors operate under a pressure of about ________.

Accepted Answer

A)  500 to 2,900 PSI 
B)  2,000 to 5,000 PSI 
C)  90 to 150 PSI 
D)  35 to 45 PSI 
A)  500 to 2,900 PSI 
B)  2,000 to 5,000 PSI 
C)  90 to 150 PSI 
D)  35 to 45 PSI

Question 7

All of the following are disadvantages of gasoline direct injection EXCEPT ________.

Accepted Answer

A)  more components compared to port fuel injection 
B)  less need for extra fuel for acceleration 
C)  higher cost 
D)  NOx storage catalyst may be needed 
A)  more components compared to port fuel injection 
B)  less need for extra fuel for acceleration 
C)  higher cost 
D)  NOx storage catalyst may be needed

Question 8

The high-pressure fuel pumps used in gasoline direct injection (GDI) systems are powered by ________.

Accepted Answer

A)  electricity (DC motor) 
B)  the crankshaft 
C)  the camshaft 
D)  electricity (AC motor) 
A)  electricity (DC motor) 
B)  the crankshaft 
C)  the camshaft 
D)  electricity (AC motor)

Question 9

Why should any high-pressure line removed be replaced with a new part on a GDI system?

Accepted Answer

A)  The ball-ends deform when tightened and will not seal if reused 
B)  The torque needed to remove the lines causes the lines to be damaged 
C)  The high-pressure lines are part of the high-pressure pump and must be replaced as an assembly 
D)  All of the above 
A)  The ball-ends deform when tightened and will not seal if reused 
B)  The torque needed to remove the lines causes the lines to be damaged 
C)  The high-pressure lines are part of the high-pressure pump and must be replaced as an assembly 
D)  All of the above

Question 10

GDI equipped engines have a higher efficiency due to a ________ compression ratio.

Accepted Answer

A)  higher 
B)  colder 
C)  related 
D)  lower 
A)  higher 
B)  colder 
C)  related 
D)  lower

Question 11

All of the following are advantages of gasoline direct injection EXCEPT ________.

Accepted Answer

A)  improved fuel economy 
B)  decreased throttle response 
C)  able to use lower-octane gasoline 
D)  higher engine efficiency 
A)  improved fuel economy 
B)  decreased throttle response 
C)  able to use lower-octane gasoline 
D)  higher engine efficiency

Question 12

Which mode of operation results in a richer air-fuel mixture near the spark plug?

Accepted Answer

A)  Stoichiometric 
B)  Homogeneous 
C)  Knock protection 
D)  Stratified 
A)  Stoichiometric 
B)  Homogeneous 
C)  Knock protection 
D)  Stratified

Question 13

This illustration shows a ________ type of combustion chamber.

Accepted Answer

A)  wall-guided 
B)  tumble-guided 
C)  spray-guided 
D)  swirl-guided 
A)  wall-guided 
B)  tumble-guided 
C)  spray-guided 
D)  swirl-guided

Question 14

The high-pressure fuel pressure is regulated by using ________.

Accepted Answer

A)  a vacuum-biased regulator 
B)  an electric pressure control valve 
C)  a non-vacuum-biased regulator 
D)  a mechanical regulator at the inlet to the fuel rail 
A)  a vacuum-biased regulator 
B)  an electric pressure control valve 
C)  a non-vacuum-biased regulator 
D)  a mechanical regulator at the inlet to the fuel rail

Question 15

Gasoline direct injection (GDI) is also known as ________.

Accepted Answer

A)  EFI 
B)  DI 
C)  UIDI 
D)  SIDI 
A)  EFI 
B)  DI 
C)  UIDI 
D)  SIDI

Question 16

Which component of this GDI high pressure pump is the pressure regulator?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
A)  A 
B)  B 
C)  C 
D)  D

Question 17

Where is the fuel injected in an engine equipped with gasoline direct injection?

Accepted Answer

A)  Directly into the combustion chamber 
B)  Into the intake manifold near the intake valve 
C)  Above the intake port 
D)  In the exhaust port 
A)  Directly into the combustion chamber 
B)  Into the intake manifold near the intake valve 
C)  Above the intake port 
D)  In the exhaust port

Question 18

A GDI system operating in stratified mode results in ________.

Accepted Answer

A)  the air-fuel mixture being evenly distributed in the combustion chamber 
B)  black smoke from the exhaust 
C)  a rich air-fuel mixture near the spark plug tip 
D)  None of these 
A)  the air-fuel mixture being evenly distributed in the combustion chamber 
B)  black smoke from the exhaust 
C)  a rich air-fuel mixture near the spark plug tip 
D)  None of these

Question 19

When compared to a port fuel injected engine, a GDI engine will have a(n) ________ compression ratio.

Accepted Answer

A)  reversed 
B)  interrupted 
C)  lower 
D)  higher 
A)  reversed 
B)  interrupted 
C)  lower 
D)  higher

Question 20

The fuel injectors used on a gasoline direct injection system are pulsed ON using what voltage?

Accepted Answer

A)  100 to 110 V 
B)  12 to 14 V 
C)  200 to 220 V 
D)  50 to 90 V 
A)  100 to 110 V 
B)  12 to 14 V 
C)  200 to 220 V 
D)  50 to 90 V

Exam 23: Gasoline Direct-Injection Systems

The SIDI high pressure fuel pump uses a single-barrel piston plunger that is driven by a(n) ________.

An engine equipped with GDI may have up to a ________ percent improvement in fuel economy.

Some engines that use a GDI system have carbon issues ________.

When the fuel pressure regulator is deactivated, the fuel pressure defaults to ________.

What GDI operating mode is used to burn sulfur from the NOx catalyst?

GDI fuel injectors operate under a pressure of about ________.

All of the following are disadvantages of gasoline direct injection EXCEPT ________.

The high-pressure fuel pumps used in gasoline direct injection (GDI) systems are powered by ________.

Why should any high-pressure line removed be replaced with a new part on a GDI system?

GDI equipped engines have a higher efficiency due to a ________ compression ratio.

All of the following are advantages of gasoline direct injection EXCEPT ________.

Which mode of operation results in a richer air-fuel mixture near the spark plug?

This illustration shows a ________ type of combustion chamber.

The high-pressure fuel pressure is regulated by using ________.

Gasoline direct injection (GDI) is also known as ________.

Which component of this GDI high pressure pump is the pressure regulator?

Where is the fuel injected in an engine equipped with gasoline direct injection?

A GDI system operating in stratified mode results in ________.

When compared to a port fuel injected engine, a GDI engine will have a(n) ________ compression ratio.

The fuel injectors used on a gasoline direct injection system are pulsed ON using what voltage?

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What GDI operating mode is used to burn sulfur from the NO_xcatalyst?