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Grade 10 Chapter 24

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

Which of the following is not part of a carburetor?
a.
Air horn.
c.
Venturi.
b.
Fuel bowl.
d.
Flow sensor.
 

 2. 

Carburetor size is usually stated in ____.
a.
CFM of airflow
c.
PSI of pressure
b.
GPM of fuel flow
d.
inches of vacuum
 

 3. 

Which carburetor device listed below allows a faster idle speed while avoiding dieseling?
a.
Fast idle cam.
c.
Hot idle compensator.
b.
Altitude compensator.
d.
Fast idle solenoid.
 

 4. 

In some choke systems, a thermostatic ____ is used to open and close the choke plate.
a.
valve
c.
piston
b.
spring
d.
actuator
 

 5. 

Which of the following is a symptom of a choke that is stuck closed?
a.
White smoke.
c.
Blue smoke.
b.
Black smoke.
d.
Brown smoke.
 

True/False
Indicate whether the statement is true or false.
 

 6. 

The fast idle cam increases engine idle speed when the choke is open.
 

 7. 

Computer-controlled carburetors cycle the mixture solenoid on and off rapidly to control the air-fuel ratio.
 

 8. 

A bowl vent prevents a pressure or vacuum buildup in the carburetor fuel bowl.
 

 9. 

The carburetor's throttle valve directly controls airflow into the carburetor.
 

 10. 

Carburetors usually have only two sections: air horn and throttle body.
 

 11. 

You should not use a wire or drill bit to clean out carburetor passages.
 

 12. 

Cold fast idle speeds are usually between 750 and 950 rpm.
 

 13. 

A hot idle speed is typically lower than either the cold idle or curb idle speeds.
 

 14. 

Float drop is adjusted to regulate distance the float can move down in the carburetor bowl.
 

 15. 

The highest idle speed setting is the curb idle speed.
 

 16. 

Engine surge is usually caused by an air-fuel mixture that is too rich.
 

Matching
 
 
Match the following terms and identifying phrases.
a.
air-fuel ratio for full acceleration
d.
air-fuel ratio for part throttle operation
b.
air-fuel ratio for highway-speed cruising
e.
air-fuel ratio for idling
c.
air-fuel ratio for cold engine starting
 

 17. 

8:1
 

 18. 

13:1
 

 19. 

15:1
 

 20. 

16:1
 

 21. 

18:1
 
 
Identify each of the marked items on the diagram below.

grp002-1.jpg
 

 22. 

Fuel.
 

 23. 

Venturi.
 

 24. 

Main discharge tube.
 

 25. 

Throttle valve.
 

 26. 

Air-fuel mixture.
 

 27. 

Fuel bowl.
 

 28. 

Air enters.
 

 29. 

Air horn or barrel.
 
 
Match the following terms and identifying phrases.
a.
clogged idle air bleed
c.
low float level
b.
choke stuck open
d.
faulty metering rod
 

 30. 

High-speed miss, stalls when cornering.
 

 31. 

Enriched air-fuel mixture, upsetting idle.
 

 32. 

Upsets only high-speed engine operation.
 

 33. 

Engine won’t start when cold; once started, usually stalls.
 

Completion
Complete each statement.
 

 34. 

The main carburetor housing is usually called the carburetor ______________________________.
 

 

 35. 

Multiple-barrel carburetors allow an engine to develop more ______________________________.
 

 

 36. 

The ______________________________ valve regulates the amount of fuel flowing into the carburetor’s fuel bowl.
 

 

 37. 

For the idle system to operate, the throttle must be ______________________________.
 

 

 38. 

There are two types of accelerator pumps: ______________________________ and diaphragm.
 

 

 39. 

A(n) ______________________________ rod alters fuel flow by moving into and out of the carburetor’s high-speed jet.
 

 

 40. 

Engine ______________________________ is a condition in which engine power at cruising speeds seems to alternately increase and decrease.
 

 

 41. 

A(n) ______________________________ is used in many carburetors to control the hot idle speed.
 

 

 42. 

Carburetor ______________________________ occurs when fuel pours out the top of the carburetor or leaks around the bowl gasket.
 

 

 43. 

A missing or disconnected ______________________________ hose could be the source of a carburetor problem.
 

 

Short Answer
 

 44. 

What safety precaution should you observe while adjusting idle speed with the engine running?
 

 45. 

Name the systems of the carburetor that should be checked as possible causes of a problem.
 



 
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