ASVAB Automotive Information Test 3

Question 1

What is the purpose of a vehicle's PCV (Positive Crankcase Ventilation) valve?

Accepted Answer

Vent crankcase gases back into the intake manifold

Answer

The PCV valve routes blowby gases from the crankcase back into the intake manifold to be burned, reducing emissions and preventing oil contamination.

Question 2

Which type of valve spring arrangement uses two concentric springs in a single valve?

Accepted Answer

Dual-coil spring

Answer

A dual-coil (or dual) spring setup uses an inner and outer coil spring together to prevent valve float at high RPM and provide redundancy.

Question 3

What component prevents the transmission from engaging when the parking brake is not set on vehicles equipped with a brake-transmission shift interlock?

Accepted Answer

Shift interlock solenoid

Answer

The shift interlock solenoid physically locks the gear selector in Park unless the brake pedal is depressed, preventing accidental gear engagement.

Question 4

In a disc brake system, what is the function of the caliper piston dust boot?

Accepted Answer

Keep contaminants out of the piston bore

Answer

The dust boot is a rubber seal that covers the caliper piston to prevent dirt, moisture, and road debris from entering the piston bore and causing corrosion.

Question 5

What does a vehicle's OBD-II system primarily monitor?

Accepted Answer

Emission-related engine and drivetrain components

Answer

OBD-II (On-Board Diagnostics II) continuously monitors emission-related systems such as the engine, transmission, and exhaust to detect malfunctions and store fault codes.

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ASVAB Automotive Information Test 3