asvab automotive III

Which system is required to start an automobile?

• Electrical

• Lubrication

• Exhaust

• Drive train

Answer explanation

The correct answer is (A). A car’s electrical system controls lighting, starting, charging, and accessories.

Which of the following is NOT part of an internal combustion engine?

• piston ring

• connecting rod

• clutch

• cylinder head

Answer explanation

The correct answer is (C). The clutch is part of the drive train system.

In a four-stroke engine, which of the following is NOT one of the four strokes?

• Intake

• Compression

• Out-take

• Exhaust

Answer explanation

The correct answer is (C). Each stroke is the movement of the piston from one end of the cylinder to the other. The four strokes are called Intake, Compression, Power, and Exhaust.

In the diagram below, what is the location of the fuel pressure regulator?

• A

• B

• C

• B

Answer explanation

The correct answer is (C). As pictured above, the fuel pressure regulator regulates pressure in the fuel rail according to intake manifold vacuum.

Which part of the fuel system sprays a fuel and air mixture into the engine's combustion chamber?

• fuel pump

• fuel injector

• fuel filter

• fuel pressure regulator

Answer explanation

The correct answer is (B). Fuel injectors atomize the fuel by pumping it through a small nozzle under high pressure. Atomizing the fuel is the process of breaking it into a fine misted spray.

What part of a car's exhaust system is responsible for turning the toxic components of engine exhaust into less toxic compounds?

• cylinder head

• exhaust manifold

• muffler

• catalytic converter

Answer explanation

The correct answer is (D). After being collected in the exhaust manifold, exhaust gases are then sent to the catalytic converter where toxic pollutants are converted into less toxic compounds by catalyzing a redox reaction.

Which of the following is the location of the differential on a drive axle?

• A

• B

• C

• D

Answer explanation

The correct answer is (D). A differential allows cars to rotate at different speeds as the car goes around a corner. It helps the drive axle split the power between the two drive wheels.

The brake caliper is an assembly that houses the

• brake pads and pistons

• brake boosters

• brake shoes

• drum brakes

The part of the tire that grips the rim of the wheel is the

• bead

• sidewall

• shoulder

• ply

Answer explanation

The correct answer is (A). The bead is the inner edge of a tire. It is normally made with high-strength rubber and is reinforced with steel wire.

If one complete revolution of the steering wheel causes the wheels to turn 20 degrees, what is the steering ratio?

• 12:1

• 15:1

• 18:1

• 20:1

Answer explanation

The correct answer is (C). A complete revolution of the steering wheel is 360 degrees. Thus, the steering ratio is 360:20 which reduces to 18:1 (360/20=18).