| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.94 |
| Score | 0% | 59% |
An overcooled engine:
is less efficient |
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is more efficient |
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generates more power |
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uses less gasoline |
An overcooled engine is less efficient. During the power stroke, combustion heat pushes down the piston. If too much of this heat is lost to the cooling system, the fuel might not combust completely and contaminate the engine's lubricating oil diminishing its lubricating ability. Incomplete combustion of fuel also negatively affects the engine's fuel efficiency and power output.
Opposed cylinder designs feature two rows of cylinders that are placed at what angle to each other?
45° |
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90° |
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180° |
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270° |
Opposed cylinder designs place cylinders flat in two rows 180° opposite each other with a single crankshaft running between them.
What type of energy does an automotive battery produce?
chemical energy |
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rotational energy |
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alternating current |
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direct current |
An automotive battery produces direct current for use by automotive systems.
The distributor is responsible for:
distributing power to the correct drive wheels |
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recharging the battery |
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utlizing battery power to start the engine |
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timing the spark and distributing it to the correct cylinder |
The distributor is driven by the engine's camshaft and is responsible for timing the spark and distributing it to the correct cylinder. The distributor cap contains a rotor that connects the ignition coil (and its high voltage) to the proper cylinder at the proper point in the stroke cycle.
__________ results from oil buildup in the combustion chamber.
detonation |
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preignition |
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combustion |
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engine knock |
Preignition results from the buildup of fuel deposits and/or oil in the combustion chamber. These deposits increase chamber pressure and reduce heat tranfer to the coolant. The trapped heat then raises the temperature of the air-fuel mix to the point that it combusts before ignition.