CO CDL COMBINATION TEST - PRACTICE TEST
11.
You are inspecting your vehicle during a trip. What should you do?
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Watch gauges for signs of trouble.
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Use your senses to check for problems.
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Check critical items such as tires, brakes, and lights.
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All of the above.
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12.
You are coupling a tractor to a semi-trailer and have backed up but are not yet under the trailer. Before backing under the semi-trailer, you should hook up:
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the landing gear.
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the emergency and service air lines.
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the electrical service cable.
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the safety chain.
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13.
If you must make an emergency stop, you should:
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apply the brakes as hard as you can to lock them.
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use the hand brake before the brake pedal.
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brake in a way that will keep your vehicle in a straight line.
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None of the above.
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14.
When driving in very hot weather, the heat will increase the chances of:
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ABS malfunction.
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loss of hydraulic pressure.
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suspension system defects.
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tire failure.
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15.
To prevent rollover, you should:
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keep the cargo as close to the ground as possible.
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drive slowly around on ramps and off ramps.
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go slowly around turns.
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All of the above.
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16.
When you make a quick lane change, the crack-the-whip effect can:
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the trailer to swing wide to the left.
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turn the trailer over.
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improve your traction.
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make it harder to turn without skidding.
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17.
The iron trailer supports are up, and the full weight of the trailer is resting on the tractor. Make sure:
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there is enough clearance between the upper and lower fifth wheel.
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there is enough clearance between the rear of the tractor frame and the landing gear.
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you are in a low enough gear.
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the safety latch is not engaged.
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18.
The service line is also called:
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signal line or air line.
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carrier line or control line.
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pressure line or signal line.
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control line or signal line.
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19.
Inspecting the fifth-wheel does NOT include:
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backing until the fifth-wheel just touches the trailer.
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checking that there are no cracks in the frame.
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making sure that the fifth wheel is in the proper position for coupling.
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checking for missing or damaged parts.
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20.
If you are being tailgated, you should:
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increase your following distance.
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speed up.
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move to the left lane.
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flash your brake lights.
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