ASE Short Answer 3

Question 1

What is the purpose of the PCV (Positive Crankcase Ventilation) valve?

Accepted Answer

Route crankcase blow-by gases back to the intake to be burned

Answer

The PCV valve meters blow-by vapors from the crankcase into the intake so they are reburned instead of vented.

Question 2

A technician finds milky, light-brown oil on the dipstick. What does this most likely indicate?

Accepted Answer

Coolant mixing with the engine oil

Answer

A milky appearance means coolant has entered the oil, often from a blown head gasket or cracked component.

Question 3

Which type of transmission uses a torque converter instead of a clutch to transfer engine power?

Accepted Answer

Automatic transmission

Answer

An automatic transmission uses a fluid-coupling torque converter rather than a driver-operated clutch.

Question 4

What is the recommended first step before working on any high-voltage hybrid or electric vehicle system?

Accepted Answer

Disable and isolate the high-voltage system per the service procedure

Answer

High-voltage systems must be properly de-energized and isolated using the manufacturer's procedure before service.

Question 5

A customer reports a steering wheel shimmy felt mainly at highway speed. What is the most common cause?

Accepted Answer

Out-of-balance front tire/wheel assembly

Answer

Speed-related steering shimmy is most commonly caused by an unbalanced front wheel assembly.

ASE Practice Test