NEW MEXICO CDL COMBINATION PRACTICE TEST
11.
If the drive wheels start to skid:
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accelerate slightly to regain control.
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push in the clutch to let them turn freely.
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use the brakes to slow down.
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12.
A truck tractor with _________ requires the shortest stopping distance.
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an empty trailer
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a fully loaded trailer
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a lightly loaded trailer
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13.
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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14.
Which of these is NOT part of the basic method for shifting up?
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Accelerate while pressing the clutch and turn toward the driver's side.
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Push in the clutch and shift to the higher gear at the same time.
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Release the accelerator, push in the clutch and shift to neutral at the same time.
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15.
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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100 psi
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50 psi
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150 psi
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16.
If you try to couple when the trailer is too low:
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the tractor could roll away.
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it might not couple correctly.
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the tractor may strike and damage the trailer nose.
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17.
Which of the following is NOT part of testing the tractor protection valve?
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Charging the trailer air brake system.
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Stepping on and off the brake pedal several times to reduce the air pressure in the tanks.
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Pulling forward slowly, then applying the trailer brakes.
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18.
Glad hands are:
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coupling devices.
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warning devices.
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securement devices.
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19.
If the ABS is not working:
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the vehicle will have no brakes.
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you still have normal brake functions.
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the vehicle will have weak brakes.
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20.
The best way to test the trailer service brakes is to:
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pull forward quickly, then apply the trailer brakes with your hand control.
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accelerate to the maximum possible speed, then apply the trailer brakes fully.
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None of the above.
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