COMBINATION PRACTICE TEST - DC CDL
11.
After a tire has been changed, the driver should stop a short while later to:
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decrease tire pressure.
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deflate the tire to 10 psi.
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check tread separation.
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check the tightness of the nuts.
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12.
Which of these statements is true?
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Large combination vehicles take longer to stop when they are fully loaded than when they are empty.
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"Bobtail" tractors can take longer to stop than a combination vehicle loaded to maximum gross weight.
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Trailer skids are more likely to happen when the trailer is empty or lightly loaded.
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All of the above.
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13.
Which of the following is NOT a way to determine if your trailer is equipped with ABS (antilock braking system)?
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Wheel speed sensor wires are coming from the back of the brakes.
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It was built after March 1, 1998.
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It has yellow ABS malfunction lamps.
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The letters "ABS" are printed on the side of the steering wheel.
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14.
If driving a new vehicle, you should familiarize yourself with the controls and equipment:
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as you drive.
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within the first 50 miles.
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before you start driving.
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after pulling into a service station.
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15.
Your vehicle has hydraulic brakes. When you press the brake pedal while driving and the pedal goes to the floor, remember that:
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pumping the brake pedal may generate enough hydraulic pressure to stop the vehicle.
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shifting into neutral may help slow the vehicle.
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the parking brake should never used to slow the vehicle.
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All of the above.
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16.
When driving trucks with trailers, drivers should:
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decrease their following distance.
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make quick lane changes.
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push the brake pedal to the floor when braking.
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avoid making sudden movements with the steering wheel.
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17.
You must check that all shut-off valves are in the open position except the ones:
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on the first trailer in a set of triples.
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on the first trailer in a set of doubles.
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on the middle trailer of a set of triples.
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at the back of the last trailer.
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18.
The trailer hand valve should be used only:
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when the trailer is fully loaded.
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to test the trailer brakes.
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only in combination with the foot brake.
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in driving to prevent skids.
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19.
When inspecting the coupling, check that the safety latch is:
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in the "lock" position.
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pushing against the kingpin.
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in position over the locking lever.
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None of the above.
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20.
When backing a trailer, if you turn the wheel left:
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the cab and the trailer will go left.
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the cab will go left and the trailer will go right.
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the cab will go right and the trailer will go left.
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the cab and the trailer will go right.
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