In a charcoal canister fuel-venting system, which of the following components is used to ensure that only vapor and not liquid fuel reaches the canister?
A. A liquid/vapor separator
B. A canister filter
C. A purge line
D. A vapor lock
2. In an automotive engine, the condition in which the air-and-fuel mixture in the combustion chamber ignites before the piston is in its proper position is called
A. detonation.
B. normal combustion.
C. vaporization.
D. preignition.
3. An air-to-fuel ratio of 8 to 1 is considered to be a(n)
A. simple mixture.
B. rich mixture.
C. ideal mixture.
D. lean mixture.
4. In an automobile that contains a mechanical fuel pump, the pump is usually driven by
A. the crankshaft.
B. a belt-drive system.
C. the camshaft.
D. an electric motor.
5. Which of the following devices is attached to the float arm of a fuel sender in order to vary the current flow sent to the fuel gage?
A. A pressure regulator
B. A rheostat
C. A solenoid
D. A diaphragm
6. In a timed fuel-injection system, the air-to-fuel ratio is usually controlled by
A. varying the amount of time the fuel pump is allowed to operate.
B. varying the fuel pressure.
C. changing the size of the injectors.
D. varying the amount of time the injectors are open and closed.
7. In an automotive engine, normal combustion usually begins at a point just before the
A. piston reaches TDC.
B. spark plug fires.
C. piston reaches BDC.
D. air-and-fuel mixture ignites on its own.
8. The breaking of fuel into small particles is called
A. vaporization.
B. atomization.
C. condensation.
D. enrichment.
9. In most automotive engines, the device used to control the amount of air that enters the engine is the
A. air cleaner.
B. pressure regulator.
C. rheostat.
D. throttle plate.
10. The measure of how well a gasoline can resist detonation and preignition is called its
A. RFG.
B. air-to-fuel ratio.
C. oxygenate.
D. octane.
11. An automotive fuel-injection system in which fuel always flows from the injectors is called a
A. carburetor system.
B. continuous-flow system.
C. timed system.
D. PCV system.
12. Carburetor systems usually operate with fuel pressures of between
A. 0 and 1 psi.
B. 2 and 8 psi.
C. 10 and 20 psi.
D. 20 and 60 psi.
13. In an automobile, the purpose of a PCV system is to
A. return unused fuel to the fuel tank.
B. cool the combustion chamber temperature.
C. recirculate the crankcase gases back to the combustion chamber.
D. control the amount of air that enters the cylinder.
14. The type of fuel-injection system that contains a separate injector for each of the engine's cylinders is called a
A. multiport injection system.
B. central-body injection system.
C. throttle-body injection system.
D. carburetor system.
15. Most mechanical fuel pumps are the ______ type.
A. rotary
B. vacuum
C. diaphragm
D. solenoid
16. An automotive technician is testing the operation of a fuel gage. The technician observes that when the fuel-gage wire is grounded, the gage reads empty, and when the wire is unhooked, the gage reads full. This indicates that the problem is probably a defective
A. wire connecting the gage to the sender.
B. fuel-gage sending unit.
C. fuel gage.
D. fuel pump.
17. In an automotive engine, the condition in which the air-and-fuel mixture ignites in more than one area of the combustion chamber at the same time is called
A. detonation.
B. preignition.
C. normal combustion.
D. vaporization.
18. The ideal air-to-fuel ratio for a typical automotive engine is considered to be about
A. 8.5 to 1.
B. 10.7 to 1.
C. 14.7 to 1.
D. 12.4 to 1.
19. Inside a fuel tank, the component that allows fuel to be drawn from near the bottom of the fuel tank is the
A. rheostat.
B. filler pipe.
C. purge line.
D. pickup tube.
20. In an automobile, the purpose of an EGR system is to
A. return unused fuel to the fuel tank.
B. cool the combustion chamber temperature.
C. recirculate the crankcase gases back to the combustion chamber.
D. control the amount of air that enters the cylinder.Fuel Systems Help is Needed?
1 B
2 D
3 A OR C ??
4 A
5 D
6 ??
7 A
8 B
9 D
10 D
11 C ??
12 ??
13 C
14 A
15 B ??
16 C
17 A
18 B
19 D
20 C
you can send the check for the homework answers to ........Fuel Systems Help is Needed?
If you read the book, and study, you will learn these things for yourself and not need to cheat by getting the answers from someone else.Fuel Systems Help is Needed?
1 C
2 D
3 B
4 Trick Question, it's due to pressure differential i.e. diaphram pump
5 B
6 D
7 A
8 B
9 D but you should say the entire throttle body assembly as emission equipped vehicles using an EGR valve recirculate gasses back into the intake beyond what's taken in through the throttle body, also can't forget about crank case gases through the PCV...
10 D
11 B Also known as a return vs non-return system i.e. fuel injected are return, most carb setups are returnless
12 B Again, misleading question but if we're ignoring forced induction vehicles (draw through carb) but
13 C
14 A
15 C
16 C
17 A
18 D
19 D
20 B for emissions sake!Fuel Systems Help is Needed?
REad the book... You might be working on my car someday.
