COMBINATION PRACTICE TEST - ND CDL
11.
Enough tread is especially important in winter conditions. You need at least ________ tread depth on steering axle tires.
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8/32 inch
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2/8 inch
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4/32 inch
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6/24 inch
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12.
You should test the coupling by:
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pulling against the pin of the second semitrailer.
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applying the parking brakes so the rig will not move.
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locking the pintle hook.
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disconnect the safety chains.
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13.
If a drawbridge does not have a signal light or traffic control attendant, you should:
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stop and look to make sure the draw is completely closed before crossing.
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stop at least 5 feet before the draw of the bridge.
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drive through the drawbridge with caution.
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get through the drawbridge as quickly as possible.
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14.
Which of these is more likely to rollover due to the "crack-the-whip" effect?
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The last trailer of doubles
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The front trailer of 65 ft. conventional doubles
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The last trailer of triples
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5-axle tractor semitrailers
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15.
If the spring brakes do not release when you push the trailer air supply control, you should:
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pump the brakes.
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rev or
lug the engine.
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check the air line connections.
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check the electrical cables.
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16.
What is the proper following distance for a 50 foot truck traveling at 50 mph?
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6 seconds
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10 seconds
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5 seconds
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25 seconds
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17.
Before driving a vehicle with a dual air brake system, you should allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
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100 psi
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150 psi
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50 psi
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35 psi
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18.
You have two tie-downs on a 15 foot load. How many more tie-downs do you need to secure cargo and keep it from shifting or falling?
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Three
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Two
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One
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None
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19.
When checking your tires during a pre-trip inspection, which of the following is acceptable?
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Dual tires that come in contact with parts of the vehicle
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Mismatched sizes
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Tires made by different manufacturers
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Cracks in the tires
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20.
When the wheels of a trailer lock up, the trailer will tend to swing around. This is more likely to happen when:
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the trailer is empty or lightly loaded.
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the trailer is overloaded.
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the trailer is fully loaded.
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None of the above.
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