ASVAB Automotive Information 5

Question 1

What is the purpose of a vehicle's catalytic converter?

Accepted Answer

To convert harmful exhaust pollutants (HC, CO, NOx) into less harmful substances

Answer

The catalytic converter uses chemical reactions over precious metal catalysts to convert harmful hydrocarbons, carbon monoxide, and nitrogen oxides into water vapor, carbon dioxide, and nitrogen.

Question 2

A vehicle's power steering system is making a whining noise when turning. What is the most likely cause?

Accepted Answer

Low power steering fluid level

Answer

Low power steering fluid causes the power steering pump to work harder and cavitate, producing a characteristic whining or groaning noise especially during turning.

Question 3

What is the main purpose of an engine's timing belt or timing chain?

Accepted Answer

To synchronize the crankshaft and camshaft rotation so valves open at the correct time

Answer

The timing belt/chain synchronizes the crankshaft and camshaft(s) to ensure intake and exhaust valves open and close at precisely the correct point in each piston's stroke.

Question 4

In automotive electrical systems, what does the term 'ground' refer to?

Accepted Answer

The return path for electrical current, typically the vehicle's metal chassis

Answer

In automotive systems, the ground is the common return path for electrical current, using the vehicle's metal body and chassis to complete circuits back to the battery's negative terminal.

Question 5

What condition is indicated when white smoke pours from a vehicle's exhaust?

Accepted Answer

Coolant (antifreeze) is entering the combustion chamber and being burned

Answer

Persistent white smoke from the exhaust typically indicates coolant is leaking into the combustion chamber, often due to a blown head gasket or cracked cylinder head.

ASVAB - Armed Services Vocational Aptitude Battery Practice Test

ASVAB - Armed Services Vocational Aptitude Battery Practice Test

ASVAB Automotive Information 5