Section 3 Engine Systems
206
11. Breaker point contacts are made of a very
hard material called _____.
12. Name fi ve advantages of a solid state ignition
system.
13. The only moving parts in a CDI system are
the _____ in the fl ywheel.
14. What is the purpose of the condenser used in
an MBI system?
15. The ignition advance system causes spark to
occur _____ in the cycle during intermediate-
and high-speed operation.
16. When breaker points are set with a wider gap,
the dwell _____.
A. becomes greater
B. becomes less
C. does not change
17. Describe the operation of a waste-spark
ignition system.
18. The amount of voltage required to jump the
spark plug gap depends on _____.
A. spark plug gap
B. electrode condition
C. engine speed
D. All of the above.
19. When connecting the ignition coil in the
circuit of a battery ignition system, the
positive terminal of the battery must be
connected to _____.
A. the positive terminal of the coil
B. the negative terminal of the coil
C. either terminal of the coil
D. None of the above.
20. A(n) _____ is used to replenish energy in the
battery used in battery ignition systems.
Suggested Activities
1. Make a visible magneto mounted on a display
board or built into a clear acrylic box so that it
can be manually turned with a crank. Old, but
usable, engine parts can be used.
2. A workable battery ignition system can
be built and mounted as a display board.
Demonstrate the operation and principles
involved in this system.
3. Make a collection of various kinds of spark
plugs.
4. Section an old ignition coil to show the primary
and secondary windings around the core.
5. Carefully open a condenser to display the
lamination of aluminum foil and insulation.
6. Disassemble a magneto and demonstrate how
it works.
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