Fuel Systems






Theory and Design Electricity & Electronics Intake and Exhaust Sensors Fuel Systems
$10
What is 14.7 pounds
The weight of a 1-inch square column of air extending from the earth's surface at sea level to the outer edge of the atmosphere (numerical value)
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What is Ohm's Law
E = I x R
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What is Oxides of Nitrogen (NOx)
Formed at high temperatures by the burning of Nitrogen in the air
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What is Negative Temperature Coefficient (NTC)
Type of thermistor that reduces its resistance as temperature increases
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What is Octane number
The measure of a fuel's resistance to spark knock
$20
What is Inertia
The tendency of an object at rest to remain at rest, or the tendency of an object in motion to stay in motion
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What is1 ampere
Unit of measurement represented by the flow of 6.28 billion, billion electrons past a given point in 1 second
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What is Catalytic converter
A device that chemically reacts to exhaust gases and heat to reduce postcombustion emissions
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What is MAP sensor
Sensor that measures changes in engine vacuum, which directly relate to engine load
$20
What is Flame front
The name for the edge of the burning area inside the combustion chamber
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What is Displacement
The volume of the cylinder between BDC and TDC multiplied by the number of cylinders
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What is Parallel
The type of electrical circuit in which the total resistance is less than the value of the smallest resistive branch in the circuit
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What is Backpressure
A resistance in the exhaust system that causes an opposing force against the outgoing gases
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What is Oxygen sensor (O2)
Sends an analog voltage signal to the computer in relation to air-fuel ratio and the amount of oxygen in the exhaust stream
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What is 14.7:1
The ideal air-fuel (stoichiometric) ratio for a gasoline engine
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What is Valve overlap
The period of time that the exhaust and intake valves are both open during the exhaust stroke
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What is a Relay
An electric switch that allows a small amount of current to control a much larger one
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What is Waste-gate
A device on a turbocharger that is used to control turbo boost pressure
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What is the Knock sensor
Contains a piezoelectric sensing element that changes a vibration to an analog voltage and sends this signal to the computer
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What is Port Fuel Injection (PFI)
EFI system in which fuel injectors are mounted at the back of each intake valve
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What is Volumetric efficiency
The relationship between the amount and density of air actually taken into the cylinder compared to the amount of air required to fill the cylinder at atmospheric pressure
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What is a Thermistor
A resistor that changes values as its temperature changes
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What is Supercharger
A device driven by the engine's crankshaft used to force more air into the cylinder during its intake stroke
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What is MAF sensor
Outputs a frequency based on the amount of airflow through the sensor. It does not alter a reference voltage, but uses ignition voltage for power
$50
ORVR (On-board Refueling Vapor Recovery)
System that uses components in the fuel filler neck and tank assembly to help prevent the release of HC emissions when refueling a vehicle
What is Stratified mode
A very lean mode in which a direct fuel injected (DFI) engine operates during most driving conditions, where fuel is injected late in the compression stroke right before ignition

AUTO 120 Mid Term Review

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