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ASVAB Military Entrance Exam Sample Test

Try 5 free practice questions with instant feedback. See how ready you are.

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Sample Questions

Question 1

What is the primary function of the camshaft in a 4-stroke engine?

Answer: The camshaft controls the opening and closing of the intake and exhaust valves in sync with the pistons.

Question 2

In what order do the four strokes of a 4-stroke gasoline engine occur?

Answer: Intake, Compression, Power (Combustion), Exhaust — often remembered as 'Suck, Squeeze, Bang, Blow.'

Question 3

What does a higher compression ratio in a gasoline engine generally indicate?

Answer: A higher compression ratio means the air-fuel mixture is compressed more tightly, resulting in greater power output and efficiency, but requiring higher-octane fuel.

Question 4

What is the role of the crankshaft in an internal combustion engine?

Answer: The crankshaft converts the up-and-down (reciprocating) motion of the pistons into rotational motion that drives the vehicle.

Question 5

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

Answer: The PCV valve removes harmful blow-by gases from the crankcase and routes them back into the intake manifold to be burned, reducing emissions.