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ASVAB Auto and Shop information
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ASVAB Auto and Shop information ASVAB Auto and Shop information
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ASVAB Auto and Shopinformation EXAM UPDATED
Mixture of Gas and Air
(the fuel mixture) - ANSWER What does the Internal
Combustion engine burn?
1. Intake
2. Compression
3. Power
4. Exhaust - ANSWER What are the 4 strokes that make up a
cycle?
(in car engine)
Intake - ANSWER This valve opens as the connecting rod pulls
the piston down, drawing the gas/air mix into the cylinder
,Compression - ANSWER The valves are closed. The connecting
rod pushes the piston up, compressing gas/air mix
Power - 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 - 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 - ANSWER The name for cylinders that are arranged in
one row
V- ANSWER The name for cylinders that are arranged in two
rows
,Four-stroke, one-cycle engine - ANSWER Most people refer to
engines as four-cycle engines but this is false; what are they really called?
Tachometer - 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 - ANSWER What must happen in order for the
cycle to happen at all?
Carburetors - 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 - ANSWER ___ have replaced carburetors on
newer cars to perform the air/fuel mixture function.
Fuel Injector - 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 - 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 -
ANSWER What does the EFI computer do?
Throttle - ANSWER ___ is mechanically connected to the
carburetor
OR
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