| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.25 |
| Score | 0% | 65% |
What combines the suspension spring and shock absorber into one unit?
wheel cylinder |
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knuckle |
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strut |
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wheel hub |
Because a compressed spring will extend violently, shock absorbers must be used to dampen the spring’s compression and extension cycles. Struts combine the spring and shock into one unit
The right front wheel of your front-wheel drive car drops into a pothole and the left front wheel doesn't lose contact with the road. Which of the following is true?
your car has a rigid axle rear suspension |
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your car has an independent rear suspension |
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your car has a rigid axle front suspension |
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your car has an independent front suspension |
An independent suspension allows the wheels on either side of an axle to move independently from each other. The fact that the left front wheel didn't move up in response to the right front wheel moving down is evidence of this.
Another name for the powertrain control module is the __________ control unit.
electrical |
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universal |
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transmission |
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engine |
The main computer or powertrain control module (PCM) uses pre-programmed software to analyze the input received from sensors and produce output signals to adjust vehicle performance and operation. (Engine control unit (ECU) is another name for the PCM.)
What is the pimary advantage of using power brakes on a vehicle?
utilizes battery power to assist in braking |
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requires less brake fluid to operate the braking system |
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allows the use of antilock brakes |
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provides higher hydraulic pressure in the braking system |
Power brakes multiply the force a driver applies to the brake pedal using a vacuum booster connected to the engine intake manifold. This provides for much higher hydraulic pressure in the braking system than could be generated by the driver alone. Antilock brakes (ABS) use speed sensors and adjust the brake pressure at each wheel to prevent skidding and allow the driver more steering control in slippery conditions.
The spark plugs fire a few extra degrees before top dead center when the engine is running faster. In this case the engine's timing is:
synchronous |
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advanced |
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asynchronous |
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retarded |
Ignition timing defines the point in time at the end of the compression stroke that the spark plug fires. Measured in number of degrees before top dead center (BTDC), the exact point that the spark plugs initiate combustion varies depending on the speed of the engine. The timing is advanced (the spark plugs fire a few more degrees BTDC) when the engine is running faster and retarded when it's running slower.