CDL COMBINATION PRACTICE TEST (SC)
11.
You should use chocks when parking a trailer without spring brakes because:
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the brakes will hold only as long as there is air pressure in the trailer air tank.
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it is required by law.
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it helps prevent brake failure.
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it helps prevent skids.
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12.
When driving a combination vehicle, which of the following 2 things will help you prevent a rollover?
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Keeping cargo near the center of the vehicle and driving slowly on turns.
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Keeping cargo near the center of the vehicle and driving slowly on the highway.
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Keeping cargo near the ground and driving slowly on the highway.
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Keeping the cargo near the ground and driving slowly around turns.
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13.
If you are being tailgated, you should:
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turn on your taillights.
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drive on the shoulder.
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try to let the other vehicle pass.
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speed up.
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14.
Emergency lines on combination vehicles are often coded with the color ____ to keep from getting them mixed up with the ____ service line.
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blue; red
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red; yellow
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yellow; black
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red; blue
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15.
You are coupling a tractor to a semi-trailer. After checking the trailer height but before supplying air to the trailer, you should:
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raise the front trailer supports.
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lock the trailer brakes.
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connect the air lines to the trailer.
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inspect the fifth-wheel.
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16.
When should you use chocks to park a trailer without spring brakes?
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Only when parking uphill
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Only when parking downhill
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Always
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Never
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17.
The best way to recognize that your trailer has started to skid is:
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by hearing squeaking noises from the wheels.
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by using retarders.
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by seeing it in your mirrors.
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None of the above.
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18.
After starting the engine, oil pressure should rise to a normal level:
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within 6 minutes.
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within 3 miles.
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within 2 minutes.
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within seconds.
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19.
If you are feeling sleepy, you should:
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slow down and drive on the shoulder of the road.
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pull off the road and rest or take a nap.
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increase your speed to get to the destination quicker.
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None of the above.
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20.
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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35 psi
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150 psi
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50 psi
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100 psi
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