ASVAB Study GuideAuto & Shop Information Practice Test 3
Tap an answer to check it instantly and read the explanation. 10 questions: 3 easy, 4 medium and 3 hard.
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Question 1 easy
Which stroke of a four-stroke internal combustion engine pushes the burned gases out of the cylinder?
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Correct answer: D — exhaust stroke
During the exhaust stroke, the piston moves upward in the cylinder with the exhaust valve open, forcing out the spent combustion gases.
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Question 2 easy
What is the main function of the shock absorbers in a vehicle's suspension system?
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Correct answer: A — to dampen and control the bouncing movement of the springs
Shock absorbers control unwanted spring movement and oscillation, maintaining smooth vehicle control and keeping tires firmly planted on the road surface.
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Question 3 easy
What is a primary advantage of disk brakes compared to traditional drum brakes?
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Correct answer: A — they dissipate heat much better and resist brake fade
Disk brakes are exposed directly to airflow, allowing them to shed heat faster and maintain braking efficiency under heavy or repeated use.
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Question 4 medium
In a modern automotive cooling system, what role does the radiator pressure cap play?
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Correct answer: C — it raises the boiling point of the coolant by maintaining pressure inside the system
By keeping the cooling system under pressure, the radiator cap raises the coolant's boiling point, preventing the liquid from boiling under normal high-temperature operating conditions.
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Question 5 medium
In an automatic transmission vehicle, what component replaces the mechanical clutch to connect the engine to the transmission?
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Correct answer: B — torque converter
A torque converter is a fluid coupling device that transmits engine torque to an automatic transmission, allowing the vehicle to stop in gear while the engine continues idling.
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Question 6 medium
What primary function does the intake manifold perform in an internal combustion engine?
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Correct answer: C — delivering the air or air-fuel mixture evenly to each cylinder intake port
The intake manifold distributes the fresh air or air-fuel mixture from the throttle body evenly across all engine cylinder head intake ports.
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Question 7 medium
What happens if a vehicle's timing belt breaks while the engine is running on an interference engine?
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Correct answer: A — the pistons can collide with open valves, causing severe engine damage
In an interference engine design, the clearance between pistons and valves is very tight. A snapped timing belt stops valve movement, allowing rising pistons to strike fully open valves.
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Question 8 hard
What component inside the alternator converts the generated alternating current (AC) into direct current (DC) for the vehicle's electrical system?
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Correct answer: D — rectifier bridge (diodes)
The alternator creates AC electricity as its rotor spins inside the stator. The rectifier assembly uses diodes to convert this AC power into DC power needed by the car's 12V system and battery.
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Question 9 hard
During the power (combustion) stroke of a four-stroke engine, what are the positions of the intake and exhaust valves?
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Correct answer: B — both intake and exhaust valves remain tightly closed
During the power stroke, both valves are closed to seal the combustion chamber completely so that expanding gases force the piston downward with maximum force.
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Question 10 hard
Which specific type of piston ring is positioned lowest on the piston skirt and what is its main responsibility?
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Correct answer: A — the oil control ring, which scrapes excess oil off the cylinder wall and returns it to the crankcase
The bottom ring set is the oil control ring. It distributes a fine film of oil on the cylinder wall during upward movement and scrapes away excess oil on the downstroke to keep oil out of the combustion chamber.