Engine Maintenance

Chapter 1 - Quiz

Engine Maintenance

1. What three basic things are required for an internal combustion engine to function?

a. Air, fuel, lubrication.b. Air, fuel, source of ignition.c. Fuel, ignition, lubrication.d. Fuel, compression, ignition.

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Engine Maintenance

2. Internal combustion engines are so named because:

a. a spark is required to cause an explosion.b. burnt gases of the air-fuel mixture are

expelled through the exhaust manifold.c. energy is derived from burning an air-fuel

mixture in a confined combustion chamber.

d. the piston traveling within the cylinder causes the air-fuel mixture to explode.

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Engine Maintenance

3. When the air-fuel mixture is ignited in the combustion chamber:

a. pressure is exerted outward equally in all directions.

b. pressure is exerted downward only.

c. no pressure is exerted.d. pressure is exerted upwards only.

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Engine Maintenance

4. The bore of an engine is the:

a. length of the stroke.b. taper of the cylinder bore.c. diameter of the cylinder bore.d. flange area of the intake manifold.

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Engine Maintenance

5. The measure of the amount of work an engine does is called:

a. torque.b. horsepower.c. engine displacement.d. compression ratio.

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Engine Maintenance

6. Compression ratios of four-stroke cycle gasoline engines are:

a. higher than diesel engines.b. lower than diesel engines.c. about the same as diesel engines.d. unrelated to engine power output.

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Engine Maintenance

7. Generally, an increase in power and fuel economy is associated with:

a. torque.b. correct ignition timing.c. higher compression ratio.d. removing air filters.

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Engine Maintenance

8. A basic difference between two-stroke and four-stroke cycle gasoline engines is the:

a. type of fuel used.b. type of cooling used.c. number of pistons required.d. number of piston strokes required

to complete a cycle.

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Engine Maintenance

9. The compression of air in a modern four-stroke cycle diesel engine causes:

a. the temperature to decrease.b. the pressure to decrease.c. air flow in the intake manifold.d. the air temperature in the cylinder

to rise to approximately 1000° F (538° C).

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Engine Maintenance

10. The three basic methods of installing internal combustion engines to their drive systems are the:

a. outboard drive system, the stern drive system, and the inboard drive system.

b. stern drive system, the inboard/outboard drive system, and the outboard drive system.

c. inboard drive system, the inboard/outboard drive system, and the jet drive system.

d. outboard drive system, the jet drive system, and the inboard drive system.

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Engine Maintenance

11.The outboard drive system is unique because it:

a. can use a larger propeller than the inboard drive system.

b. is contained in one compact housing.

c. can develop greater horsepower than the stern drive system.

d. is the only drive system with a lower unit.

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Engine Maintenance

12. Inboard drive systems require:

a. a separate propeller.b. a separate lower unit.c. a separate rudder.d. a separate power head.

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Engine Maintenance

13.The stern drive system is unique in that:

a. it is always powered by 2-stroke cycle engines.

b. it endows an inboard engine with the maneuverability of an outboard drive system.

c. the engine is always mounted on the stern of the boat.

d. the power transmitting shaft never pierces the hull of the boat.

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Engine Maintenance

14.Propeller size is determined by:

a. diameter and engine rpm.b. diameter and pitch.c. number of blades and pitch.d. number of blades and diameter.

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Engine Maintenance

15. Increasing a propeller’s pitch will:

a. increase the engine’s rpm.b. increase the boat’s

maneuverability.c. decrease the engine’s rpm.d. decrease the boat’s

maneuverability.

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Engine Maintenance

16.Replacing a propeller with a water jet enhances:

a. shallow water operation.b. a boat’s steerage.c. a boat’s speed.d. thrust.

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Engine Maintenance

17.Four fundamental principles of troubleshooting marine engines are:

a. check the easy, check the obvious, make all adjustments first, and keep a log.

b. check the obvious, check the easy, check systematically, and make no erratic adjustments.

c. make all necessary adjustments first, then check the easy, check systematically, and check the obvious.

d. keep a log, check the easy, check the obvious, and check systematically. 18