AT-1 Final Exam Chapters 11-20

Fuel pumps are either __________.

• mechanical or electric

• chemical or electric

• nuclear or electric

• thermal or electric

What is the name of the technology that uses engine control systems to shut off the air-fuel mixture to some of the engine’s cylinders when all the cylinders are not needed?

• cylinder deactivation

• powertrain control module

• blow-by

• distillation

Which of the following would be a lean air-fuel mixture in a gasoline engine?

• 8:1

• 12:1

• 14.7:1

• 16:1

Removing __________ from diesel fuel is critical.

Approximately what temperature will the antifreeze freeze if mixed 50% water and 50% antifreeze?

• 212°F (100°C)

• 122°F (50°C)

• 32°F (0°C)

• -34°F (-37°C)

What is the purpose of the radiator?

• remove heat from the coolant

• add heat to the coolant

• slow down the air through the engine compartment

• keep the coolant at 195°F (91°C)

Cooler air is __________, allowing more air and fuel to go into the combustion chamber which leads to more power.

• more turbulent

• cloudy

• less dense

• denser

What is hose failure from electrical reactions between engine metal and coolant called?

• kinetic degradation

• thermal degradation

• mechanical degradation

• electrochemical degradation

What type of grease is used in spark plug boot ends to inhibit corrosion?

• dielectric

• chassis

• anti-seize

• white lithium

Most automobiles have a ______ volt DC battery.

• 2

• 6

• 12

• 120