NORTH CAROLINA DOUBLES TRIPLES PRACTICE CDL TEST
11.
If you unlock the pintle hook with the dolly still under the rear trailer:
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steam and boiling water can spray under pressure.
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the dolly tow bar may fly up.
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your vehicle might roll away.
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the brakes could be damaged by the combined forces of the springs and the air pressure.
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12.
If you will be transporting hazardous materials that require placards, you must:
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transport the materials at night only.
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obtain a hazardous materials endorsement.
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obtain a special transit permit.
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ask permission of the local transportation agency.
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13.
If a vehicle is equipped with ABS, when you start the engine:
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the spring brakes will come on.
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the wheels will lock up.
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the ABS indicator light on the dash should come on and then turn off.
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the trailer emergency brakes will come on.
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14.
When driving a truck with more than 1 trailer, drivers should:
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allow more following distance.
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be especially careful in adverse conditions.
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look far ahead so they can slow down or change lanes when necessary.
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All of the above.
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15.
Doubles and triples are:
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less likely to turn over than other combination vehicles.
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more stable than straight trucks.
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easier to drive than other combination vehicles.
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more likely to turn over than other combination vehicles because of the "crack-the-whip" effect.
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16.
When inspecting the coupling, make sure the fifth-wheel jaws have closed around the:
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head of the kingpin.
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the electrical cord.
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the brake camshaft.
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shank of the kingpin.
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17.
Watch out for black ice:
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right after it starts to rain.
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when it is snowing.
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when the temperature is above freezing and the road is dry.
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any time the temperature is below freezing and the road looks wet.
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18.
The posted speed for a curve that may be safe for a straight truck:
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is never safe for a double or triple.
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could be too fast for a double or triple.
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can be ignored when driving a double or triple.
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is likely to be safe for a double or triple.
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19.
In newer vehicles with air brakes, you put on the parking brake:
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placing the transmission in Park.
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using a P-shaped, yellow control knob.
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using a diamond-shaped, yellow, push-pull control knob.
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moving the orange push-pull lever to the right.
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20.
When you double your speed, the braking distance is:
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4 times longer.
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3 times longer.
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2 times longer.
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the same.
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