ASVAB AUTO AND SHOP INFORMATION LATEST 2025 VERSION
REVISED QUESTIONS AND VERIFIED CORRECT ANSWERS (ACCURATE
SOLUTIONS) ALREADY PASSED HIGHEST TEST GRADED A+.pdf
Mixture of Gas and Air
(the fuel mixture) - (answers)What does the Internal Combustion engine burn?
1. Intake
2. Compression
3. Power
4. Exhaust - (answers)What are the 4 strokes that make up a cycle?
(in car engine)
Intake - (answers)This valve opens as the connecting rod pulls the piston down,
drawing the gas/air mix into the cylinder
Compression - (answers)The valves are closed. The connecting rod pushes the piston
up, compressing gas/air mix
Power - (answers)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 - (answers)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 - (answers)The name for cylinders that are arranged in one row
V - (answers)The name for cylinders that are arranged in two rows
Four-stroke, one-cycle engine - (answers)Most people refer to engines as four-cycle
engines but this is false; what are they really called?
Tachometer - (answers)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 - (answers)What must happen in order for the cycle to happen at all?
Carburetors - (answers)___ 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 - (answers)___ have replaced carburetors on newer cars to perform the
air/fuel mixture function.
Fuel Injector - (answers)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 - (answers)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 - (answers)What does the
EFI computer do?
Throttle - (answers)___ 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. -
(answers)What does a Throttle do?
Cooling system - (answers)What does the engine have because of the high temperature
at which fuel burns?
Water Jackets
Water Pump
Radiator - (answers)What are the 3 components of the engine's cooling system?
Water jackets - (answers)These surround the parts of the engine that reach the highest
temperatures
(engine cooling system)
Water Pump - (answers)This circulates water through the water jackets
(engine cooling system)
Radiator - (answers)(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 - (answers)___ (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)
REVISED QUESTIONS AND VERIFIED CORRECT ANSWERS (ACCURATE
SOLUTIONS) ALREADY PASSED HIGHEST TEST GRADED A+.pdf
Mixture of Gas and Air
(the fuel mixture) - (answers)What does the Internal Combustion engine burn?
1. Intake
2. Compression
3. Power
4. Exhaust - (answers)What are the 4 strokes that make up a cycle?
(in car engine)
Intake - (answers)This valve opens as the connecting rod pulls the piston down,
drawing the gas/air mix into the cylinder
Compression - (answers)The valves are closed. The connecting rod pushes the piston
up, compressing gas/air mix
Power - (answers)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 - (answers)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 - (answers)The name for cylinders that are arranged in one row
V - (answers)The name for cylinders that are arranged in two rows
Four-stroke, one-cycle engine - (answers)Most people refer to engines as four-cycle
engines but this is false; what are they really called?
Tachometer - (answers)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 - (answers)What must happen in order for the cycle to happen at all?
Carburetors - (answers)___ 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 - (answers)___ have replaced carburetors on newer cars to perform the
air/fuel mixture function.
Fuel Injector - (answers)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 - (answers)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 - (answers)What does the
EFI computer do?
Throttle - (answers)___ 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. -
(answers)What does a Throttle do?
Cooling system - (answers)What does the engine have because of the high temperature
at which fuel burns?
Water Jackets
Water Pump
Radiator - (answers)What are the 3 components of the engine's cooling system?
Water jackets - (answers)These surround the parts of the engine that reach the highest
temperatures
(engine cooling system)
Water Pump - (answers)This circulates water through the water jackets
(engine cooling system)
Radiator - (answers)(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 - (answers)___ (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)
