COMBINATION TEST TEXAS - PRACTICE TEST
11.
If you cannot make a right turn without entering another traffic lane, you should:
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swing wide to the left before starting the turn.
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turn wide before you start the turn.
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turn wide as you complete the turn.
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watch out for vehicles coming toward you and back up for them.
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12.
The emergency air line does NOT:
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control the emergency brakes on combination vehicles.
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supply air to the trailer air tanks.
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cause the tractor protection valve to close when the emergency line loses pressure.
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pump air into the relay valves, allowing the trailer brakes to be applied more quickly.
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13.
Off-tracking is:
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when a vehicle towing a trailer skids, and the trailer pushes the towing vehicle from behind until it spins the vehicle around.
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when the tires lose their contact with the road and have little or no traction.
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when a vehicle makes a turn and the rear wheels of the trailer end up driving in a different path than the tractor and the front wheels of the trailer.
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None of the above.
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14.
To reduce the chance of rollover, you should:
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put the lightest parts of the cargo under the heaviest parts.
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distributed the cargo as low as possible inside the trailer.
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place the cargo as high as possible inside the trailer.
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None of the above.
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15.
When coupling a tractor to a semi-trailer, after checking if the fifth-wheel is in proper position for coupling you should:
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secure the vehicle.
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connect the air lines to the trailer.
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make sure the area around the vehicle is clear and the trailer wheels are chocked.
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connect the electrical cord and check the air lines.
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16.
Headache racks:
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help you keep weights within legal limits.
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can blind other drivers.
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protect you from being hit by your cargo.
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None of the above.
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17.
The tire load rating is stated:
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on each axle.
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on the dashboard.
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inside the suspension system.
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on the side of each tire.
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18.
When you inspect the coupling, make sure there is ______ between the upper and lower fifth wheel.
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enough space
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about 1/2 inch
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about 1 inch
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no space
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19.
You are coupling a tractor to a semi-trailer. After checking the trailer height but before supplying air to the trailer, you should:
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raise the front trailer supports.
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inspect the fifth-wheel.
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lock the trailer brakes.
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connect the air lines to the trailer.
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20.
Cargo should be properly covered:
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to block your view or someone else’s.
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to protect the weather from the cargo.
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to protect people from spilled cargo.
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All of the above.
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