COMBINATION TEST OKLAHOMA - PRACTICE TEST
11.
If the spring brakes do not release when you push the trailer air supply control, you should:
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check the electrical cables.
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rev or
lug the engine.
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check the air line connections.
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12.
The crack-the-whip effect:
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can turn the trailer over.
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can cause a vehicle to tilt.
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the ends of some vehicles to drag.
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13.
Air brakes use ________ to make the brakes work.
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compressed gases
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compressed gas cylinders
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compressed air
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14.
The parking brake:
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should be used when you need to apply the brakes firmly.
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should be used when driving in bad weather.
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should be used whenever you park.
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15.
To prevent a rollover, the driver should:
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make quick lane changes if possible.
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drive slowly around corners, on ramps, and off ramps.
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drive on the shoulder if possible.
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16.
Air brakes:
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should be used only when driving on wet roads.
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are an effective way to stop large and heavy vehicles.
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are prohibited on larger vehicles.
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17.
When coupling, you should:
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make sure the trailer kingpin is bent.
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make sure the trailer wheels are not chocked.
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be aware that wrong coupling and uncoupling can be very dangerous.
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18.
Longer combination vehicles have the tendency to swing wide on turns. This is called:
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hydroplaning.
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jackknifing.
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off-tracking.
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19.
The trailer hand valve should:
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never be used to test the trailer brakes.
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be used in driving.
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never be used for parking.
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20.
When you back under a trailer:
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use lowest reverse gear.
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back the tractor slowly.
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All of the above.
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