ASVAB Automotive Information 3

Question 1

What does 'overhead cam' (OHC) mean in engine design?

Accepted Answer

The camshaft is located in the cylinder head above the valves

Answer

In an overhead cam engine, the camshaft is mounted in the cylinder head directly above the valves, eliminating pushrods and allowing for higher RPM operation.

Question 2

What is the purpose of a vehicle's sway bar (stabilizer bar)?

Accepted Answer

To reduce body roll during cornering by linking opposite wheels

Answer

The sway bar connects opposite wheels through short links and reduces body roll during cornering by transferring force from the compressed side to the extended side.

Question 3

What type of oil rating system is used in the US to classify motor oil by viscosity?

Accepted Answer

SAE ratings

Answer

The Society of Automotive Engineers (SAE) viscosity rating system (e.g., 5W-30) classifies motor oil by its flow characteristics at cold and operating temperatures.

Question 4

A vehicle is pulling to one side when braking. What is the most likely cause?

Accepted Answer

A stuck or seized brake caliper on one side

Answer

A seized caliper on one side applies more braking force to that wheel than the other, causing the vehicle to pull toward the side with the stuck caliper.

Question 5

In a four-stroke engine, what occurs during the 'compression' stroke?

Accepted Answer

Both valves are closed while the piston moves up, compressing the air-fuel mixture

Answer

During the compression stroke, both intake and exhaust valves are closed and the piston moves upward, compressing the air-fuel mixture before ignition.

ASVAB - Armed Services Vocational Aptitude Battery Practice Test

ASVAB - Armed Services Vocational Aptitude Battery Practice Test

ASVAB Automotive Information 3