CDL DOUBLES PRACTICE TEST NEW MEXICO

11. Your vehicle has hydraulic brakes. When you press the brake pedal while driving and the pedal goes to the floor, remember that:
pumping the brake pedal may generate enough hydraulic pressure to stop the vehicle.
the parking brake should never used to slow the vehicle.
shifting into neutral may help slow the vehicle.
12. What can cause poor traction?
Too much weight on the steering axle.
Overloading the truck.
Too little weight on the driving axles.
13. The trailer hand valve should:
never be used for parking.
be used in driving.
never be used to test the trailer brakes.
14. Blocking and bracing are:
coupling devices used to connect the service air lines from the truck or tractor to the trailer.
driving techniques used to regain control when your drive wheels start to skid.
used to keep cargo from sliding and to prevent movement of cargo.
15. To make the brakes work, air brakes use:
compressed air.
hydraulic air.
nitrogen.
16. Which of the following will off-track the most?
The rear wheels of the last trailer.
The front wheels of the last trailer.
The rear wheels of the tractor.
17. Pre-trip inspections are:
recommended.
required by law
required only for trips of more than 50 miles.
18. Under a pressurized system, the radiator cap:
should never be removed until the system has cooled.
should never be hot.
should be removed when the coolant is hot.
19. When should you downshift automatic transmissions?
Watch your tachometer, and downshift when your engine reaches the top of the range.
When going down steep grades.
When you start to get drowsy.
20. Which of the following statements about doubles/triples is true?
Doubles/triples may have to go faster around corners than single trailer combination vehicles.
Doubles/triples are more stable than other CMVs.
A safe speed on a curve for a single trailer combination vehicle may be too fast for a double/triple.
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