ASVAB Auto and Shop: Engine Systems and Repair 4

Question 1

What is the purpose of the intake manifold on an engine?

Accepted Answer

Distribute air or air-fuel mixture to each cylinder

Answer

The intake manifold distributes the incoming air (or air-fuel mixture on carbureted engines) evenly to each cylinder's intake port.

Question 2

Which engine stroke draws the air-fuel mixture into the cylinder?

Accepted Answer

Intake stroke

Answer

During the intake stroke, the piston moves down and the intake valve opens, drawing the air-fuel mixture into the cylinder.

Question 3

What does an oil pressure warning light indicate?

Accepted Answer

Oil pressure is dangerously low, risking engine damage

Answer

The oil pressure warning light indicates that oil pressure has dropped below a safe level, which can lead to severe engine damage if not addressed immediately.

Question 4

What is the function of piston rings in an engine?

Accepted Answer

Seal combustion gases and control oil on the cylinder wall

Answer

Piston rings seal the combustion chamber against blow-by, transfer heat from the piston to the cylinder wall, and control oil film on the cylinder walls.

Question 5

A mechanic torques cylinder head bolts in a specific pattern. Why is this important?

Accepted Answer

To ensure even clamping pressure and prevent head gasket failure

Answer

Torquing head bolts in the correct sequence distributes clamping force evenly across the head gasket, preventing warping and premature gasket failure.

ASVAB - Armed Services Vocational Aptitude Battery Practice Test

ASVAB - Armed Services Vocational Aptitude Battery Practice Test

ASVAB Auto and Shop: Engine Systems and Repair 4