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80 Cards in this Set
- Front
- Back
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What type of additives are used in leaded
gasoline to slow down ignition? |
Antiknock
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Which of the following properties is a
property of gasoline? |
Volatility
Antiknock quality Octane rating |
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The measurement of the ability of a fuel to
resist knock or ping is known as |
Octane rating
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A mixture of 9 parts of air and 1 part of
gasoline is richer than one consisting of 18 parts of air and 1 part of gasoline. |
T
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Which of the following air-fuel ratios is
considered to be perfect for a gasoline engine? |
15:1
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An air-fuel mixture that is too lean will
cause which of the following conditions? |
Poor engine performance
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Which of the following is NOT a condition
of abnormal combustion? |
Spark ping
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Which of the following factors can cause
dieseling in a gasoline engine? |
Low octane fuel
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What device is used in the filler neck of a
gasoline fuel tank to prevent the accidental use of leaded fuel? |
A restrictor
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What is the function of the baffles in a fuel
tank? |
To prevent the fuel from sloshing and
splashing |
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Fuel filters are made of which of the
following materials? |
Ceramic
Treated paper Metal screen |
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What is the function of the fuel pump?
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To deliver the fuel from the tank to
the engine under pressure |
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What are the two types of fuel pumps used
in a gasoline fuel system? |
Mechanical and electrical
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What type of fuel pump delivers fuel
continuously? |
Positive displacement
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When a vacuum test is being performed on
a fuel pump, what reading indicates a good fuel pump? |
7 to 10 in/hg
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Fuel lines are normally made of what
material? |
Double-wall steel tubing
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What part of the carburetor controls air
flow through the air horn? |
Throttle valve
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The function of the venturi in a carburetor
is to |
produce sufficient suction to pull fuel
out of the main discharge tube |
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The fuel supply in the carburetor bowl is
controlled by the |
fuel pump
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What component of the float system
regulates the amount of fuel passing through the fuel inlet of a carburetor? |
Needle valve
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At speeds below 800 rpm or 20 mph, the
air-fuel mixture of the engine is controlled by what carburetor system? |
Idle
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T/ F When adjusting the idle on a carburetor,
the idle mixture screw is turned out to increase the size of the idle port. This action increases the fuel mixture at idle. |
T
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When the acceleration pump is opened,what component controls the length of time that the stream of fuel will last?
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Duration spring
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What system provides the leanest and most
fuel efficient air-fuel ratio? |
High speed
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Which of the following carburetor
components is designed to increase engine power and also maintains reasonable economy? |
Vacuum jet
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A choke alters the air-fuel mixture that
enters the manifold of a cold gasoline engine during starting by admitting |
less air
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What type of automatic choke mounts the
thermostatic spring in the top of the exhaust manifold? |
Heated well-type
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What device cracks open the choke plate as
soon as the engine starts, thus preventing the engine from flooding? |
Vacuum choke unloader
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On a carburetor, what device keeps the throttle from closing too quickly when the accelerator pedal is suddenly released?
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Throttle return dashpot
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Under high engine temperatures, what
device prevents the engine from stalling or idling rough by admitting extra air into the engine to increase idle speed? |
Hot idle compensator
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In a computerized carburetor, what sensor
allows the computer to enrich the fuel mixture during cold engine operations? |
Temperature
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T/F The manifold pressure sensor (MAP)
measures exhaust manifold pressure and engine load. |
False
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In a computerized carburetor, what device
alters the air-fuel mixture? |
Mixture control solenoid
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In a carburetor system, which of the
following conditions result in excessive fuel consumption? |
High float level
Sticking metering rod Sticking accelerator pump |
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Which of the following carburetor
conditions can be attributed to a poorly operating accelerator pump? |
Sluggish engine
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The engine runs but misses. This
malfunction is most likely caused by which of the following conditions? |
Vacuum leak at the intake manifold
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Which of the following conditions is a
good indication that the float level is too high? |
High speed nozzle is dripping
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When you are making a quick check of the
main metering system, after placing a piece of stiff cardboard over the air horn, engine speed should |
speed up slightly
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Which of the following attributes is an advantage of a gasoline injection system
over a carburetor type system? |
Improved atomization
fuel distribution Lower emissions |
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In a gasoline indirect injection system, fuel
is sprayed into the |
intake manifold
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Of the gasoline fuel injection systems, what
system is the most precise and also the most complex? |
Timed fuel injection
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In a mechanical-timed injection system, the
throttle valve regulates engine speed and power output by regulating the |
manifold vacuum
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Which of the following is a
subsystem of an electronic-timed fuel injection system? |
Fuel delivery system
Air induction system Computer control system |
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In an electronic fuel injection system, what
sensor measures the amount of outside air entering the engine? |
Air flow
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In an electronic fuel injection system, the
fuel pressure regulator diverts the excess fuel to which of the following locations? |
Back to the fuel tank
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In a continuous fuel injection system, the
cold start injector is activated by electric current from what sensor? |
Thermal
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What component of a throttle body
injection system contains the fuel pressure regulator? |
Throttle body housing
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What component actuates the throttle
positioner to open and close the throttle plates? |
Computer
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Of the following chemical compounds,
which one is a major pollutant? |
Carbon monoxide
Hydrocarbons Oxides of nitrogen |
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T/F In areas with heavy vehicular traffic,
hydrocarbons in heavy concentrations produce a gray fog. This fog is known as photochemical smog. |
F brown fog
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Exhaust manifolds are made from what
type of material? |
Cast iron
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T/F The manifold heat control valve deflects
exhaust gases toward a hot spot in the exhaust manifold until the engine reaches operating temperature |
True
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What device is used to reduce the acoustic
pressure of exhaust gases and discharge the gases into the atmosphere? |
Muffler
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The catalytic converter changes carbon
monoxide and hydrocarbons into carbon dioxide and |
water
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What two materials inside a catalytic
converter act as a catalyst? |
Platinum and palladium
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In an air injection system, what device is
used to prevent air from entering the exhaust system during deceleration? |
Diverter valve
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What device keeps exhaust gases from
entering the air injection system? |
Air check valve
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T/F The open type positive crankcase
ventilation system has a sealed breather that is connected to the air filter by a hose. |
False intake manifold or base of the carburetor.
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To control the formation of oxides of
nitrogen, the exhaust gas recirculation system recirculates a portion of the exhaust gases back through the |
intake manifold
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At idle, engine vacuum is blocked off so it
cannot act on the EGR valve. How is this accomplished? |
By a closed throttle plate
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The fuel dome provides what amount of air
space for fuel heating and volume increase? |
10 percent
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What device is used to prevent fuel from
entering the fuel tank vent line in the event of a accident in which the vehicle turns over? |
Roll-over valve
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The charcoal canister store fuel
vapors when the engine is not running. |
True
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What component connects the charcoal
canister to the engine intake manifold and is used to clean out stored fuel vapors from the charcoal canister? |
Purge line
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When the engine is turned off, heat
produces excess vapors. These vapors are carried to the charcoal canister through the |
carburetor vent line
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What fuel additive is used to prevent engine ping
or knock? |
antiknock
|
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What is the measurement of the ability of
gasoline to resist knock or ping? |
octane rating
|
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What device is used to prevent the accidental use
of leaded fuel in a vehicle designedfor unleaded fuel? |
fuel neck restrictor
|
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What are the two types of air cleaners currently
being used? |
wet- and dry-type
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Name the seven basic carburetor systems?
|
float, idle, off-idle, acceleration, high speed, full power, choke
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What system maintains a steady working supply
of fuel to a constant level in the carburetor? |
float
|
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What device acts as a damper to keep the throttle
from closing too quickly when the accelerator pedal is suddenly released? |
throttle return dashpot
|
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What sensor in a computerized carburetor
system measures intake vacuum and engine load? |
manifold pressure sensor (MAP)
|
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What type of fuel injection system is the most
precise but is also the most complex? |
Q9. timed injection
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In an electronic fuel injection system, what
sensor is used to detect engine speed? |
crankshaft postion sensor
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On a throttle body injection system, what device
is used to control engine idle speed? |
throttle positioner
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A gasoline engine produces what three major pollutants?
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hydrocarbons, carbon monoxide, and oxides of nitrogen
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What material(s) is used in a catalytic converter to act(s) as a catalyst?
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platinum and palladium
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What type of catalytic converter is of a honeycomb design?
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monolithic
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What device is used to prevent exhaust gas recirculation when the engine is cold?
|
coolant temperature switch
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