NEW HAMPSHIRE CDL COMBINATION PRACTICE TEST
11.
Which of the following is true about the trailer hand valve?
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The trailer hand valve works the trailer brakes.
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If used in driving it could cause the trailer to skid.
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It should be used only to test the trailer brakes.
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All of the above.
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12.
Combination vehicles usually require _________ single commercial vehicles.
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the same level of skill as
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more driving skill than
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less driving skill than
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None of the above.
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13.
A red triangle with an orange center means:
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Slow-moving vehicle
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Law enforcement vehicle
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The vehicle is hauling hazardous materials
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Liquid tanker
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14.
The iron trailer supports are up, and the full weight of the trailer is resting on the tractor. Make sure:
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you are in a low enough gear.
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the safety latch is not engaged.
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there is enough clearance between the upper and lower fifth wheel.
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there is enough clearance between the rear of the tractor frame and the landing gear.
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15.
Emergency brakes must be must be held on by:
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air pressure.
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water.
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mechanical force.
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the locking mechanism.
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16.
When backing a truck you should:
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look straight ahead.
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back and turn toward the right side.
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get out and walk around the vehicle before you begin to back.
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always rely on your mirrors.
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17.
The use of brakes on a steep downgrade is:
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the main braking factor.
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much more effective than the engine braking effect.
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a supplement to the braking effect of the engine.
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dangerous, and should be avoided at all costs.
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18.
After coupling the trailer, begin raising the landing gear by using:
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the electrical cord.
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the crank handle.
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the high gear range.
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the low gear range.
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19.
Before starting down a hill, you should:
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apply the brakes hard.
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look for an escape route.
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release the accelerator and shift to Neutral at the same time.
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slow down and shift to a lower gear.
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20.
ABS helps you:
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stop much faster.
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avoid wheel lock up and maintain control of your vehicle when you brake.
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steer gently and smoothly while you are braking.
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increase your normal braking capability.
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