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ASVAB AUTO AND SHOP INFORMATION
QUESTIONS AND ANSWERS
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
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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)
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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
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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?
ASVAB AUTO AND SHOP INFORMATION
QUESTIONS AND ANSWERS
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
,2 | Page
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)
,3 | Page
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
, 4 | Page
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?
