CDL COMBINATION PRACTICE TEST NEW HAMPSHIRE
11.
When backing with a trailer, you should:
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make pull-ups to re-position your vehicle as needed.
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look at your line of travel before you begin backing.
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check your mirrors on both sides frequently.
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All of the above.
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12.
Having ABS on only the trailer:
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is very dangerous.
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makes the trailer more likely to roll over.
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still gives you more control over your vehicle during braking.
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makes the trailer more likely to swing out.
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13.
Livestock:
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can move around in a trailer and cause unsafe handling.
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should never be carried on a trailer.
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should never be kept bunched together.
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should always be placed in the rear of the trailer.
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14.
What factors can cause brakes to fail or fade?
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Brakes out of adjustment
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Excessive use of the service brakes
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Not relying on the engine braking effect
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All of the above.
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15.
When backing a trailer, you should:
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turn the steering wheel in the opposite direction of the turn.
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avoid using the brakes.
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try to position your vehicle so you can back on a curved path.
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turn the steering wheel toward the direction you want to go.
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16.
If the ABS is not working:
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you still have normal brake functions.
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the vehicle will have weak brakes.
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the vehicle will have no brakes.
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None of the above.
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17.
Before connecting the converter dolly to the rear trailer, make sure that:
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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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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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18.
Emergency brakes are:
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not required on commercial vehicles with air brakes.
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not required on doubles.
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required on all vehicles.
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not required on buses.
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19.
You are driving a heavy vehicle with a manual transmission, and you have to stop on the shoulder while driving on an uphill grade. When putting your vehicle back in motion up the grade, you should:
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partly engage the clutch before you take your right foot off the brake.
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use the parking brake to hold the vehicle until the clutch engages.
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keep the clutch slipping while slowly accelerating.
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shift down to a speed that you can control without using the brakes.
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20.
Which of these is more likely to rollover due to the "crack-the-whip" effect?
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The front trailer of 65 ft. conventional doubles
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5-axle tractor semitrailers
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The last trailer of triples
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The last trailer of doubles
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