Engine Maintenance

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Engine Maintenance
Chapter 1 - Quiz
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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 15. Increasing a propellers pitch will
• a. increase the engines rpm.
• b. increase the boats maneuverability.
• c. decrease the engines rpm.
• d. decrease the boats maneuverability.

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• 16. Replacing a propeller with a water jet
  enhances
• a. shallow water operation.
• b. a boats steerage.
• c. a boats speed.
• d. thrust.

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• 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.

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