MA CDL COMBINATION TEST - PRACTICE TEST

11. When a vehicle goes around a corner, the rear wheels:
follow the same path as the front wheels.
will turn freely.
will lock up.
follow a different path than the front wheels.
12. When the wheels of a trailer lock up:
ABS will increase stopping power.
the vehicle will gradually come to a complete stop.
the trailer will tend to swing around.
All of the above.
13. What happens when the center of gravity of a truck moves higher up from the road?
The truck becomes easier to turn over.
It is easier it is to turn around corners.
The vehicle is more stable while turning.
It becomes much easier to downshift at the right rpm.
14. To avoid rollovers, you should drive slowly:
around corners.
off ramps.
on ramps.
All of the above.
15. When backing a trailer, you should:
never make pull-ups to reposition your vehicle.
turn the steering wheel in the direction you want to go.
avoid correcting the drift.
try to position your vehicle so you can back in a straight line.
16. By pushing the trailer air supply control knob in, you:
keeps air in the tractor or truck brake system.
supply the trailer with air.
supply the tires with air.
shut the air off and put on the trailer emergency brakes.
17. The service line:
carries air to the parking brake to control the trailer brakes.
carries air and is connected to relay valves which allow the trailer brakes to be applied more quickly.
carries power steering fluid to control the trailer brakes.
None of the above.
18. If you get stuck on railroad tracks, you should:
stay in the vehicle and call for help.
check the engine compartment quickly.
get out of the vehicle and away from the tracks.
have a helper push your vehicle.
19. How many red reflective triangles should you carry?
5
2
3
6
20. When inspecting the coupling, check that the safety latch is:
in position over the locking lever.
pushing against the kingpin.
in the "lock" position.
None of the above.
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