ASVAB AUTO INFORMATION YEAR 2020 EXAM QUESTIONS

PDF Download

ASVAB AUTO INFORMATION YEAR 2020 EXAM QUESTIONS

Actual Qs and Ans - Expert-Verified Explanation -Guaranteed passing score -61 Questions and Answers

-Format: Multiple-choice / Flashcard

Question 1: 15- Camshaft: A camshaft is what opens and closes the intake and exhaust valves. It turns at half the speed of the crankshaft.

Answer:

16- Wrist pins:

A wrist pin connects the piston to the connecting rod.Question 2: Diesel engines, also called compression ignition engines, are internal combustion engines, but they're a little simpler than standard gasoline engines are. Many of the vehicles you'll use in the military are diesel-powered. Diesel engines don't rely on a spark to ignite the fuel. Instead, the engine injects fuel right into the combustion chamber of a cylinder, where the air is so compressed (and hot) that it ignites the fuel without a spark. Glow plugs assist in heating the air, but they don't produce an electrical spark. These engines are more powerful and more efficient with their fuel than gasoline-powered engines are (because they don't rely on throttling or a spark). Most modern diesels produce less carbon dioxide than gas-powered engines do, thanks to emissions control devices, but they still produce significant amounts of nitrogen oxide and nitrogen dioxide, as well as fine particulate matter that's harmful to human health.

Answer:

MAKING THE GRADE: OCTANE RATINGS

Question 3: All-wheel drive (four-wheel drive):

Answer:

All wheels push and pull the car at the same time. The drive shaft extends from the transmission to both axles.Question 4: Positive-crankcase ventilation:

Answer:

method (still in use) that forces unspent or partially spent fuel back into the cylinder so the fuel can burn Question 5: Emissions-control systems: Filtering out pollutants

Answer:

Exhaust systems aren't they only systems that deal with emissions. Think of the engine as a giant cigarette and the emissions-control system as a filter. The exhaust from automobiles contains pollutants, including carbon monoxide. These pollutants are a result of the combustion process (or they're partially combusted or unburned fuel). To prevent these pollutants from poisoning the atmosphere, manufacturers place emissions-control systems on cars. These systems include the

following:

Question 6: Disk brakes

Answer:

In a disc-brake system, the master cylinder forces a caliper containing a piston or pistons, with brake pads on each side, to squeeze against a rotor disc in each wheel, thus stopping your car by using fluid and pressure on both sides of the rotor.Question 7: Also called A-arms, these long, metal pieces connect to the steering knuckle with ball joints and keep it vertical when the wheels move up and down. You find an upper and a lower arm on each steering knuckle.

Answer:

Tie Rods Question 8: A. The transmission's job is to make sure the right amount of power gets to the vehicle's wheels so it can move at a certain speed. The transmission works because it contains a series of gears, and the lower the gear, the more power (but slower speed) it generates. First gear is the largest.

Answer:

• A catalytic converter

(A) injects fuel into the combustion chamber. (B) converts chemical energy into mechanical energy. (C) runs the exhaust manifold. (D) reduces toxic emissions.

Question 9: C. The alternator gets power from the battery and uses it to operate the starter, ignition, and electronic accessories. It continues to circulate power through the vehicle while the vehicle is running.

Answer:

• The system that controls how much power goes to a vehicle's wheels is its

(A) transmission. (B) fuel injector. (C) spark plug TDC. (D) spark plug BDC.Question 10: When metal grinds against metal, it breaks down. The solution: engine oil. An oil pump circulates oil through the engine; oil flows through the crankshaft and connecting rods, lubricating as it goes. Oil does more than lubricate moving parts, though. When oil touches hot engine parts, like the pistons, it picks up the heat and transfers it elsewhere. It also acts as a sealer between things like the piston rings and cylinder walls. Motor oil is often mixed with additives that also snatch up contaminants and drop them off in the engine's oil filter. Even better, oil makes engines run more quietly (so your radio doesn't have to work as hard).

Answer:

A standard lubrication system includes the following:

Question 11: The tires are a vehicle's first - and hopefully only - contact with the road. The air inside the tires helps with stability and handling.

Answer:

Springs:

Question 12: Tie rods transfer force from the steering linkage or steering rack to the steering knuckle, which causes a wheel to turn.

Answer:

A vehicle's steering system lets the driver control where the wheels go. A driver can use light force to steer a heavy car because most cars use one of two systems: rack-and-pinion or Pitman arm steering.Both of these types of steering are often power-assisted, which makes turning the steering wheel and getting a response from the vehicle's wheels easier.Question 13: Exhaust manifold: The manifold connects to the exhaust ports on the cylinder head, where combustion takes place.

Answer:

Catalytic converter: The catalytic converter contains a honeycomb-like set of passageways or small ceramic beads coated with catalysts that create chemical reactions. These chemical reactions transform the most toxic compounds in exhaust to less-harmful compounds, like carbon dioxide and water.

Question 14: C. The flywheel accelerates a rotor to a high speed and uses rotational energy to maintain and store the energy to keep the engine speed constant as the flywheel and rotor work together. As for the other devices, the drive shaft turns the rear axle. The cylinder contains the piston that moves the connecting rod that's connected to the crankshaft, which turns the flywheel.

Answer:

4- A catalytic converter (A) neutralizes toxins.(B) creates chemical reactions. (C) converts heat energy into power. (D) controls the drivetrain.Question 15: A. Coolant (typically antifreeze mixed with water) runs through the radiator, which exposes it to outside air so heat energy can escape.

Answer:

2- A carburetor has the same function as a/an (A) distributor. (B) fuel-injection system. (C) alternator. (D) exhaust system.Question 16: D. Antifreeze raises the boiling point of water and lowers the freezing point. This process keeps the water in the cooling system from overheating or freezing. Either condition can cause damage to the engine.

Answer:

• What assembly is pictured?

Question 17: No matter how powerful an engine is, it's no use if you can't control the vehicle.The suspension system, steering system, and tires, with some help from on-board computers, tackle that big job.

Answer:

Struts:

Question 18: Catalytic converter:

Answer:

monoxide into water vapor and carbon dioxide (the same thing people exhale); doesn't control other types of pollutants such as nitrogen oxides Question 19: Drive systems: Taking it for a spin

Answer:

Having a working engine is all fine and dandy, but the power of the engine still has to be transferred to the wheels to make them move. This is the job of the drive system. Cars have drivetrain systems that run on axles. The axle is the shaft on which the wheels revolve. The universal joint allows the axle to move up and down without breaking the drive shaft. The drive shaft is the connecting component that