| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.95 |
| Score | 0% | 59% |
Engines with radial cylinder configurations are most common in:
heavy truck engines |
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aircraft engines |
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tank engines |
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train engines |
A radial arrangement places cylinders in a circle around the crankshaft and is used almost exclusively in aircraft engines.
What is the name of the proper ratio of air to fuel necessary so that an engine burns all fuel with no excess air?
ignition ratio |
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stoichiometric ratio |
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residual ratio |
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combustion ratio |
The stoichiometric ratio defines the proper ratio of air to fuel necessary so that an engine burns all fuel with no excess air. For gasoline fuel, the stoichiometric ratio is about 14.7:1 or for every one gram of fuel, 14.7 grams of air are required. Too much air results in a lean air-fuel mixture that burns more slowly and hotter while too much fuel results in a rich mixture that burns quicker and cooler.
What function does a two-stroke cycle engine perform on the second stroke?
combustion and exhaust |
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compression and combustion |
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fuel intake and compression |
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fuel intake and exhaust |
The two strokes of a two-stroke cycle engine are fuel intake and compression then combustion and exhaust.
The catalytic converter output consists primarily of:
oxygen |
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carbon monoxide |
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gasoline |
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water and carbon dioxide |
The catalytic converter converts pollutants in exhaust gas into less pollutant substances like carbon dioxide and water.
Which of the following is not a characteristic of disc brakes?
uses a rotor |
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uses brake shoes |
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uses brake pads |
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newer brake system |
Both drum brake and disc brake assemblies use friction to stop a car's wheels from turning but each do it in a slightly different way. A drum brake assembly uses a large iron drum attached to the wheel and brake shoes that press against the drum to slow the rotation of the drum and, consequently, the wheel. A disc brake assembly employs friction in the same way as a drum brake but instead uses a rotor, also attached to the wheel, and two brake pads that squeeze against the surface of the rotor.