Preguntas CDL de Dobles y Triples (T) gratis

Preguntas de ejemplo de este examen

1. Compared with other commercial vehicles, doubles and triples are:Comparados con otros vehículos comerciales, los dobles y triples son:
   1. More stable
   2. Less stable
   3. Equally stable
   4. More stable only when empty
   Ver respuesta

   Less stable

   Doubles and triples are less stable, and more things can go wrong.

   Son menos estables y pueden fallar más cosas.

2. In a set of triples, which trailer is most likely to turn over in a quick lane change?En un triple, ¿qué remolque es más probable que se vuelque en un cambio rápido de carril?
   1. The first trailer
   2. The middle trailer
   3. All are equally likely
   4. The last trailer
   Ver respuesta

   The last trailer

   Because of the crack-the-whip effect, the last trailer is most likely to turn over.

   Por el efecto latigazo, el último remolque es el que más se vuelca.

3. Why should you look far ahead when pulling doubles or triples?¿Por qué mirar lejos al jalar dobles o triples?
   1. So you can slow down or change lanes gradually
   2. To read the DOT number
   3. To keep the ABS lamp off
   4. So you can drive faster
   Ver respuesta

   So you can slow down or change lanes gradually

   They must be driven very smoothly; looking far ahead lets you make gradual changes.

   Deben manejarse con suavidad; mirar lejos permite cambios graduales.

4. Why are doubles and triples more likely to skid in bad weather and mountain driving?¿Por qué los dobles y triples derrapan más con mal tiempo y en montaña?
   1. Their brakes are weaker
   2. They cannot use tire chains
   3. They have more length and more dead axles to pull with the drive axles
   4. They cannot use the foot brake
   Ver respuesta

   They have more length and more dead axles to pull with the drive axles

   Greater length and more dead axles mean more chance of skids and loss of traction.

   Más largo y más ejes muertos significan más derrapes y pérdida de tracción.

5. How can you tell a converter dolly has antilock brakes?¿Cómo sabe que un dolly tiene frenos antibloqueo?
   1. It has red glad hands
   2. It has a yellow lamp on the left side
   3. It has a blue lamp on the right side
   4. It has two axles
   Ver respuesta

   It has a yellow lamp on the left side

   These dollies have a yellow ABS lamp on the left side.

   Tienen una luz amarilla de ABS en el lado izquierdo.

6. For the safest handling, where should the more heavily loaded trailer be?Para el manejo más seguro, ¿dónde va el remolque más cargado?
   1. In first position, right behind the tractor
   2. In the rear position
   3. In the middle of a triple only
   4. It does not matter
   Ver respuesta

   In first position, right behind the tractor

   Put the heavier trailer first behind the tractor and the lighter one in the rear.

   El más pesado va primero detrás del tractor y el más ligero atrás.

7. How do you release the brakes on a converter dolly without spring brakes?¿Cómo suelta los frenos de un dolly sin frenos de resorte?
   1. Push in the air supply knob
   2. Pull the trolley valve
   3. Open the air tank petcock
   4. Close the shut-off valves
   Ver respuesta

   Open the air tank petcock

   Release dolly brakes by opening the air tank petcock (or use the dolly parking brake control if it has spring brakes).

   Se sueltan abriendo la llave de purga del tanque.

8. What do you check when making a visual check of the dolly coupling?¿Qué revisa en la revisión visual del enganche del dolly?
   1. That the ABS lamp is lit
   2. No space between upper and lower fifth wheel and the locking jaws closed on the kingpin
   3. That the landing gear is on the ground
   4. That the glad hands are crossed
   Ver respuesta

   No space between upper and lower fifth wheel and the locking jaws closed on the kingpin

   Look for no gap between the upper and lower fifth wheel, and for jaws closed on the kingpin.

   Sin espacio entre las quintas ruedas y mordazas cerradas en el kingpin.

9. What three things connect the dolly and trailers besides the coupling itself?¿Qué tres cosas se conectan entre dolly y remolques además del enganche?
   1. Landing gear, crank and chocks
   2. ABS lamp, ECU and sensors
   3. Mud flaps, reflectors and tires
   4. Safety chains, air hoses and light cords
   Ver respuesta

   Safety chains, air hoses and light cords

   Connect safety chains, air hoses and light cords.

   Se conectan cadenas de seguridad, mangueras y cables de luces.

10. Why should you pull the dolly out from under the rear trailer before disconnecting it from the trailer in front?¿Por qué sacar el dolly de debajo del remolque trasero antes de soltarlo del remolque de adelante?
    1. If you unlock the pintle hook with the dolly under the trailer, the tow bar may fly up
    2. The dolly brakes will lock
    3. The ABS will turn off
    4. The rear trailer will roll away
    Ver respuesta

    If you unlock the pintle hook with the dolly under the trailer, the tow bar may fly up

    Unlocking the pintle hook while the dolly is still under the rear trailer can make the tow bar spring up and hurt you.

    Nunca suelte el pintle con el dolly debajo; la lanza puede saltar y lastimarlo.

11. When uncoupling a triple-trailer rig, which trailer do you uncouple first?Al desenganchar un triple, ¿qué remolque se desengancha primero?
    1. The first trailer
    2. The second trailer
    3. The third trailer
    4. Any order is fine
    Ver respuesta

    The third trailer

    Uncouple the third trailer first by pulling the dolly out, then unhitching the dolly.

    Primero el tercero, sacando el dolly y luego soltándolo.

12. In a set of doubles, the shut-off valves at the rear of the FIRST trailer should be:En un doble, las válvulas de cierre atrás del PRIMER remolque deben estar:
    1. Closed
    2. Open
    3. Half open
    4. Removed
    Ver respuesta

    Open

    Rear of front trailers: OPEN. Rear of last trailer: CLOSED.

    Atrás de los delanteros: ABIERTAS. Atrás del último: CERRADAS.

13. What should you check on the pintle hook during inspection?¿Qué revisa en el gancho pintle en la inspección?
    1. That it is greased like a fifth wheel
    2. That it is open
    3. That the ABS lamp is near it
    4. That the dolly pintle eye is in place and the hook is latched
    Ver respuesta

    That the dolly pintle eye is in place and the hook is latched

    Be sure the pintle eye of the dolly is in the pintle hook and the pintle hook is latched.

    El ojo pintle del dolly debe estar en el gancho y el gancho trabado.

14. When inspecting doubles, what should you check about the light cords?Al inspeccionar dobles, ¿qué revisa en los cables de luces?
    1. That they are coiled on the dolly
    2. That they are unplugged to save power
    3. That they are firmly in their sockets on the trailers
    4. That they are crossed with the air lines
    Ver respuesta

    That they are firmly in their sockets on the trailers

    Be sure light cords are firmly in the sockets on the trailers.

    Los cables de luces deben estar firmes en sus conectores.

15. During the air flow test, why must the trailer hand brake or brake pedal be applied when you open the service line valve?En la prueba de aire, ¿por qué aplicar el freno de mano o el pedal al abrir la válvula de servicio?
    1. To set the ABS
    2. To keep the landing gear up
    3. So there is air in the service line to come out
    4. To close the tractor protection valve
    Ver respuesta

    So there is air in the service line to come out

    The service line only has air when the brakes are applied, so the test assumes the hand brake or pedal is on.

    La línea de servicio solo tiene aire al aplicar los frenos.