CDL DOUBLES TRIPLES PRACTICE TEST TEXAS
11.
To use the controlled braking method in an emergency, you should:
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pump the brake pedal 3 times.
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apply the brakes when the wheels lock up.
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apply the brakes as hard as you can without locking the wheels.
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apply your brakes all the way, and release the brakes when the wheels lock up.
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12.
If you must drive slowly, how should you alert following drivers?
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Turn on your taillights
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Help them out by signaling when it is safe to pass
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Flash your brake lights
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Use your emergency flashers if it is legal
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13.
Hanging meat in a refrigerated truck can be:
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a very unstable load with a low center of gravity.
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a very stable load with a low center of gravity.
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a very unstable load with a high center of gravity.
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a very stable load if properly distributed.
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14.
Before driving a vehicle with a dual brake brake system, the driver should:
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pump the brake pedal 10 times to build pressure.
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wait at least 10 minutes before driving.
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allow time for the air compressor to build up a minimum of 100 psi pressure in both the primary and secondary systems.
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wait at least 5 minutes before driving.
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15.
Which of the following statements about traveling alongside other vehicles is true?
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You should never drop back or pull forward to make sure the other driver can see you.
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You should travel next to other vehicles whenever possible.
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You should avoid traveling next to other vehicles whenever possible.
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None of the above.
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16.
As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
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a thumping sound.
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the service line valve close.
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air escaping from the open valve.
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a mechanical vibration.
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17.
You should test the coupling by:
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applying the parking brakes so the rig will not move.
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disconnect the safety chains.
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locking the pintle hook.
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pulling against the pin of the second semitrailer.
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18.
When your vehicle starts to skid, you must take action to:
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accelerate and countersteer.
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use controlled braking.
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use stab braking.
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restore traction to the tires.
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19.
Brake lag is:
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the amount of air pressure required to stop the vehicle.
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the time required for the air brakes to work after the brake pedal is pushed.
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the distance your vehicle will travel, in ideal conditions, while you are braking.
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the distance your vehicle will continue to travel, in ideal conditions, before you hit the brakes.
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20.
Air tank drains:
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protect the tanks and the rest of the system from too much pressure.
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are used to move air to the brakes.
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are used to remove water and oil from the air tanks.
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should not be used in wet weather.
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