68 of 84
Chapter 23: SMALL ENGINE OPERATION
Answers to Review Questions
TRUE/FALSE
1. Small engines require an outside source of power.
2. Nine percent of small-engine injuries are caused by the operator.
3. An engine can produce power on its own.
4. Internal combustion means that combustion occurs in an enclosed chamber.
5. The four terms used to describe the operation of small engines are cycle, stroke,
combustion, and four-stroke cycle engine.
6. Two-stroke cycle engines are lighter weight than four-stroke cycle engines.
7. The exhaust stroke of a four-stroke cycle engine occurs when the piston reaches
the bottom and starts upward.
8. The two-stroke cycle diesel engine is common in agriculture.
9. Lubricants are used to keep engine parts running smoothly.
10. Most large engines use an electrical starting system.
MULTIPLE CHOICE
1. How many hours can small engines operate without requiring major repairs?
69 of 84
2. What does the combustion process not require?
3. A(n) ___ is the full travel of the piston in one direction, either toward or away from
the crankshaft.
4. When the piston reaches the top of its stroke, it is said to be at ___.
5. What is the purpose of the exhaust stroke?
6. Which of the following is an example of a piece of equipment that operates using a
two-stroke cycle engine?
7. The purpose of the ___ system is to allow clean air to enter the combustion
chamber.
8. What does a lubrication system not do?
9. Most large engines use a(n) ___ starting system.
10. Annually, in the United States, ___ people are injured mowing grass.
DISCUSSION
1. List the 13 safety precautions that should be taken when operating small engines.
The 13 safety precautions are as follows:
70 of 84
2. What are the four events that must take place for an internal combustion engine to
run smoothly?
3. Describe the difference between TDC and BDC.
4. What is the main difference between a two-stroke cycle engine and a four-stroke
cycle engine?
5. List five characteristics of four-stroke cycle engines as compared to two-stroke
cycle engines.
6. What is the difference in the fuel sources of gasoline and diesel engines?
7. What are the eight engine systems?
71 of 84
8. List and describe the two types of cooling systems.
9. What is the purpose of a lubrication system?
10. Why do you think proper small engine operation is important in agriculture?