ASVAB AUTO SHOP EXAM QUESTIONS

PDF Download ASVAB (AUTO & SHOP) EXAM QUESTIONS Actual Qs and Ans - Expert-Verified Explanation -Guaranteed passing score -41 Questions and Answers

-Format: Multiple-choice / Flashcard

Question 1: question: the purpose of the oil pump is to ______

Answer:

answer:

provide lubrication and prevent friction between metal parts of the engine

explanation:

lubrication is important to extend the life of the engine parts and to lower the engine temperature by preventing friction.

Question 2: combustion

Answer:

combustion is the burning of an air-fuel mixture to provide energy. it requires the presence of air, fuel, and a heat source to ignite the air-fuel mixture

Question 3: oil viscosity

Answer:

the primary component of the lubrication system is engine oil. engines require oil blends with different thickness (viscosity) and additives depending on their operating conditions. viscosity is rated using the format XW-XX with the number preceding the W (winter) rating the oil's viscosity at 0 ? (-17.8 ?) and the XX indicating viscosity at 100 ?.

Question 4: crankshaft

Answer:

converts the reciprocating motion of the piston into the rotational motion that's used to power the vehicle and its component

Question 5: lubrication system

Answer:

the lubrication system lubricates engine components by putting an oil film between them to reduce friction and smooth engine operation, cools by absorbing heat from engine parts, seals the pistons and cylinders to contain combustion, cleans contaminants, and quiets engine noise.Question 6: question: what does "EFI" stand for in EFI computer?

Answer:

answer:

electronic fuel injection

explanation:

the EFI computer controls the amount of fuel being injected into the engine electronically.

Question 7: internal combustion

Answer:

combustion happens inside the engine utilizing a fuel like gasoline, diesel fuel, or natural gas

Question 8: intake stroke

Answer:

piston moves downwards in the cylinder creating a vacuum that pulls an air-fuel mix into the combustion chamber

Question 9: power stroke

Answer:

the spark plug fires and ignites the compressed air-fuel mixture then the combustion pushes the piston back down the cylinder toward the bottom

Question 10: cylinders

Answer:

cylinders act as a guide for the pistons that translate the heat energy of combustion into the mechanical energy needed to move a vehicle

Question 11: compression stroke

Answer:

piston moves back up from the bottom of the cylinder and compresses the air fuel mixture

Question 12: coolant

Answer:

modern car engines are cooled by liquid which circulates through the engine block and cylinder heads absorbing excess heat. this liquid is made up of half water and half antifreeze (commonly, ethylene glycol) which both keeps the water from freezing at low temperatures and raises its boiling point making heat transfer more efficient.Question 13: question: the function of the tachometer is to _______.

Answer:

answer:

measure revolutions per minute

explanation:

the tachometer measures RPM on the dashboard.

Question 14: combustion chamber

Answer:

located in the cylinder head directly above the piston, it is where the actual combustion of the air-fuel mixture takes place

Question 15: camshaft

Answer:

a rotating shaft within the engine that opens and closes the intake and exhaust valve in the engine Question 16: question: joe loves to go on wild nature adventures. he always brings his four-wheel-drive truck. in difficult terrain, such as deep snow or loose sand, why would joe's truck do better than a 2-wheel drive SUV?

Answer:

answer:

a greater number of driven wheels increases the likelihood of gaining traction.

explanation:

four-wheel drive vehicles have power applied to both the front and rear axles.

Question 17: question: ron had his dad's permission to use his car, even though the predicted weather was frigid and a snowstorm was expected. ron remembered to check the oil and refill the cooling system with water the night before he left. he also positioned the car near the end of the driveway so he could easily get out if the snow started overnight.the next morning, the car started fine, but steam began to come from under the hood after he had driven for a while. what is the most likely cause of this?

Answer:

answer:

he forgot to add antifreeze, as well as water, to the cooling system.

explanation:

antifreeze lowers the freezing point of water to prevent it from freezing during cold weather. if the water in the cooling system freezes (as it might in the weather described), the car will start, but the radiator will overheat when no water can reach it because the water is frozen. steam from under the hood would be a symptom of this. the car would not have started at all if the battery was dead. oil issues would not cause steam and any amount of oil would not have been used in a short time. the engine may be old, but steam, by itself, is not an indication of it needing to be replaced.Question 18: question: if a driver inserts the key to start his car and the car does not start, then there is a problem with the ignition system. Seeing that the car has a full tank of gas, the next logical thing to do is

______

Answer:

answer:

check the batteries by turning on the lights or radio.

explanation:

the ignition system needs current from the car battery to crank the engine.

Question 19: cylinder head gasket

Answer:

seals the cylinder and prevents gas, and air leaks for maximum compression

Question 20: pistons

Answer:

sliding pieces within cylinders that move back and forth