ASVAB AUTO AND SHOP INFORMATION WITH COMPLETE SOLUTIONS 100% 2023/2024 Mixture of Gas and Air
(the fuel mixture) - correct answer What does the Internal Combustion engine burn?
1. Intake
2. Compression
3. Power
4. Exhaust - correct answer What are the 4 strokes that make up a cycle?
(in car engine)
Intake - correct answer This valve opens as the connecting rod pulls the piston down, drawing the gas/air
mix into the cylinder
Compression - correct answer The valves are closed. The connecting rod pushes the piston up, compressing gas/air mix
Power - correct answer 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
Exhaust - correct answer 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.
Inline - correct answer The name for cylinders that are arranged in one row
V - correct answer The name for cylinders that are arranged in two rows Four-stroke, one-cycle engine - correct answer Most people refer to engines as four-cycle engines but this is false; what are they really called?
Tachometer - correct answer 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)
Fuel must be properly mixed with air and transported within the cylinder at the proper time - correct answer What must happen in order for the cycle to happen at all?
Carburetors - correct answer ___ 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
Fuel Injectors - correct answer ___ have replaced carburetors on newer cars to perform the air/fuel mixture function.
Fuel Injector - correct answer 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)
Electronic Fuel Injection computer - correct answer EFI computer stands for ___?
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 - correct answer What does the EFI computer do?
Throttle - correct answer ___ is mechanically connected to the carburetor OR
___ is electronically connected to the EFI computer
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 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. - correct answer What does a Throttle do?
Cooling system - correct answer What does the engine have because of the high temperature at which fuel burns?
Water Jackets
Water Pump
Radiator - correct answer What are the 3 components of the engine's cooling system?
Water jackets - correct answer These surround the parts of the engine that reach the highest temperatures
(engine cooling system)
Water Pump - correct answer This circulates water through the water jackets
(engine cooling system)
Radiator - correct answer (engine cooling system)
While the water circulates, it absorbs heat from the engine and then passes through the ___, where outside air cools the water.
Antifreeze - correct answer ___ (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 - correct answer ___ is usually mixed with the water in an engine cooling system
Oil Pump - correct answer A ___ circulates oil through the engine; oil flows through the crankshaft and connecting rods, lubricating it as it goes.
Friction & Heat - correct answer Lubrication (from the oil pump) reduces ___, which in turn reduces ___.
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