| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.16 |
| Score | 0% | 63% |
Coolant is circulated through the engine by the:
camshaft |
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radiator |
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water jacket |
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water pump |
The water pump is driven by a belt connected to the crankshaft and ensures that coolant moves through the engine and radiator.
Which of the following is the correct order for the engine stroke cycle?
intake, power, compression, exhaust |
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compression, intake, power, exhaust |
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power, intake, compression, exhaust |
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intake, compression, power, exhaust |
The stroke cycle order is intake stroke, compression stroke, power stroke, exhaust stroke.
What is the function of the alternator?
replaces the electrical energy that the car draws from the battery |
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charges the battery when the car is not running |
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provides AC power for the car's electrical components |
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converts motion from the wheels into DC power |
An automobile's electrical system runs on DC power and the bulk of that power is supplied by the battery. The alternator converts the motion of the rotor into AC power which is then fed through the rectifier to convert it to DC power that both the car and the battery can use.
What is the name of the proper ratio of air to fuel necessary so that an engine burns all fuel with no excess air?
combustion ratio |
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residual ratio |
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ignition ratio |
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stoichiometric 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.
Just before the piston reaches top dead center, the spark plug fires and ignites the compressed air-fuel mixture. This describes which engine stroke?
exhaust |
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compression |
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intake |
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power |
During the power stroke, just before the piston reaches top dead center, the spark plug fires and ignites the compressed air-fuel mixture. The resulting expansion due to combustion pushes the piston back down the cylinder toward bottom dead center.