ND CDL COMBINATION TEST - PRACTICE TEST
11.
You must have at least 4/32 inch tread depth in every major groove on front tires and at least ___ inch on other tires.
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4/32
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1/32
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2/32
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3/32
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12.
Blocking and bracing are:
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used to keep cargo from sliding and to prevent movement of cargo.
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driving techniques used to regain control when your drive wheels start to skid.
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coupling devices used to connect the service air lines from the truck or tractor to the trailer.
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None of the above.
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13.
At passive railroad crossings, even if there are active railroad signals that indicate the tracks are clear, you must _________ to be sure it is safe to proceed.
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go, look and put the transmission in neutral
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stop, look, and listen
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go, stop and listen
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listen, look and stop
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14.
When the trailer breaks away or develops a bad leak, the tractor protection valve will close automatically and:
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the trailer supply valve will stay open.
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the engine will shut down.
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the trailer emergency brakes will come on.
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the tractor will lose all air pressure.
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15.
If your trailer starts to skid, you should:
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accelerate slightly.
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use the trailer hand brake (if you have one) to straighten out the rig.
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keep the rear of your vehicle close to the curb.
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release the brakes to get traction back.
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16.
Do not use the trailer hand valve in driving because:
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of the danger of making the trailer skid.
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the trailer emergency brakes will come on.
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the brakes can overheat and lose their braking power.
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All of the above.
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17.
When should you use chocks to park a trailer without spring brakes?
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Never
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Always
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Only when parking downhill
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Only when parking uphill
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18.
Banked curves:
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have a safe "design speed".
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should always be avoided.
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are reserved for pedestrians.
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can be taken at any speed.
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19.
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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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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a thumping sound.
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20.
Before connecting the converter dolly to the rear trailer, make sure that:
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the locking jaws rest on the kingpin.
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the trailer height is slightly lower than the center of the fifth-wheel.
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the kingpin rests on the fifth-wheel.
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the shut-off valves at the rear of the first trailer are open.
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