WY CDL COMBINATION TEST - PRACTICE TEST
11.
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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the parking brake should never used to slow the vehicle.
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shifting into neutral may help slow the vehicle.
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pumping the brake pedal may generate enough hydraulic pressure to stop the vehicle.
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All of the above.
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12.
If you have convex mirrors, be aware that:
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in a convex mirror objects appears larger than they really are.
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objects seem closer than they really are.
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objects may appear to be faster than they really are.
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everything appears smaller in a convex mirror than it would if you were looking at it directly.
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13.
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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6/24 inch
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4/32 inch
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14.
When uncoupling, after you unlock the fifth-wheel you should:
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pull the tractor clear of the trailer.
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pull the tractor partially clear of the trailer.
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ease the pressure on the locking jaws.
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chock the trailer wheels.
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15.
You should test the coupling by:
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locking the pintle hook.
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disconnect the safety chains.
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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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16.
If a load is 50 feet long, the minimum number of tie-downs required is:
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10
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5
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3
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4
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17.
When driving trucks with trailers, drivers should:
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avoid making sudden movements with the steering wheel.
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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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18.
Tests have shown that trucks with a high center of gravity:
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are less likely to roll over when entering a curve.
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can roll over if the driver slows down before entering a curve.
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can roll over at the posted speed limit for a curve.
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can roll over if the driver exceeds the posted speed limit for a curve.
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19.
Tests have shown that trucks with a high center of gravity are more likely to tip over, therefore you should:
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distribute the cargo as low as possible.
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put the lightest parts of the cargo under the heaviest parts.
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distribute the cargo so the majority of the weight is on the steering axle.
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All of the above.
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20.
When you make a quick lane change, the crack-the-whip effect can turn the trailer over. The crack-the-whip effect is caused by:
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worn tire tread.
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rearward amplification.
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the rear trailer of a triple.
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strong wind.
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