ASVAB AUTO AND SHOP INFORMATION EXAM QUESTIONS AND ANSWERS 100% PASS

ASVAB AUTO AND SHOP INFORMATION EXAM QUESTIONS AND ANSWERS 100% PASS What does the Internal Combustion engine burn? - Mixture of Gas and Air (the fuel mixture) What are the 4 strokes that make up a cycle? (in car engine) - 1. Intake 2. Compression 3. Power 4. Exhaust This valve opens as the connecting rod pulls the piston down, drawing the gas/air mix into the cylinder - Intake The valves are closed. The connecting rod pushes the piston up, compressing gas/air mix - Compression The spar plug ignites the gas/air mix, forcing the piston down. That pushes down on the connecting rod, turning the crankshaft; the crankshaft turns the flywheel, which keeps the engine going - Power The ___ valve opens as the connecting rod moves the piston back up, pushing out the exploded gases. The valves are times, of course, using pus rods attached to the camshaft. - Exhaust The name for cylinders that are arranged in one row - Inline The name for cylinders that are arranged in two rows - V 2 | P a g e Created by Katelyn Whitman © 2025, All Rights Reserved. Most people refer to engines as four-cycle engines but this is false; what are they really called? - Four- stroke, one-cycle engine Instrument in a vehicle the measures revolutions per minute; rpm (e.g. when this displays 4,800 rpm, that means the engine is performing 4,800 cycles every minute) - Tachometer What must happen in order for the cycle to happen at all? - Fuel must be properly mixed with air and transported within the cylinder at the proper time ___ are used (pre 1990) to mix the fuel and air mechanically. As air moves quickly through this, it creates a vacuum, which draws more and more fuel into the mixture - Carburetors ___ have replaced carburetors on newer cars to perform the air/fuel mixture function. - Fuel Injectors The ___ acts as the fuel-dispensing nozzle. It injects liquid fuel directly in to the engine's air stream. (In almost all cases it requires an external pump) - Fuel Injector EFI computer stands for ___? - Electronic Fuel Injection computer What does the EFI computer do? - Determines the amount of fuel entering the engine: receives information from the sensors in the fuel, air, and exhaust system, and from that information, it determines how much fuel the engine needs to operate at optimum levels ___ is mechanically connected to the carburetor OR ___ is electronically connected to the EFI computer - Throttle What does a Throttle do? - Advancing (opening) the throttle causes more fuel to be transferred to the carburetor or the fuel injectors. The accelerator (gas pedal) is connected to the throttle by mechanical 3 | P a g e Created by Katelyn Whitman © 2025, All Rights Reserved. linkages. The harder you push on the gas pedal, the farther the throttle is advanced (opened). Thus, more fuel is transported to the carburetor or fuel injectors. What does the engine have because of the high temperature at which fuel burns? - Cooling system What are the 3 components of the engine's cooling system? - Water Jackets Water Pump Radiator These surround the parts of the engine that reach the highest temperatures (engine cooling system) - Water jackets This circulates water through the water jackets (engine cooling system) - Water Pump (engine cooling system) While the water circulates, it absorbs heat from the engine and then passes through the ___, where outside air cools the water. - Radiator ___ (a coolant) raises the boiling point of water (which keeps water from boiling away) and lowers its freezing point (which keeps the system from freezing up during cold weather) - Antifreeze ___ is usually mixed with the water in an engine cooling system - Antifreeze A ___ circulates oil through the engine; oil flows through the crankshaft and connecting rods, lubricating it as it goes. - Oil Pump Lubrication (from the oil pump) reduces ___, which in turn reduces ___. - Friction & Heat An electric motor powered by the battery that starts the engine when you turn the key - Starter 4 | P a g e Created by Katelyn Whitman © 2025, All Rights Reserved. This sends an electric current back to the battery to keep the battery charged and also powers the other electronic gadgets on your car when the engine is running - Alternator This supplies a high-voltage current to the spark plugs to ignite the fuel mixture in the cylinders - Ignition system The ___ system takes the 12-volt current from the battery, steps it up to about 20,000 volts, and then sends the current to the spark plugs - Ignition system In older cars, this device uses electromagnetic induction to step up the voltage (ignition system) - Coil After leaving the coil, the current then passes through ___, an electrical/mechanical switching device; controls the timing of the spark-plug discharges (ignition system, older cars) - Distributer