SC CDL DOUBLES TRIPLES TEST - PRACTICE TEST

11. Having ABS on only the trailer:
still gives you more control over your vehicle during braking.
is very dangerous.
makes the trailer more likely to swing out.
makes the trailer more likely to roll over.
12. Hydroplaning:
can occur at speeds as low as 10 mph, if there is a lot of water.
can occur only if there is a lot of water on the road.
can occur at speeds as low as 30 mph.
is less likely if tire pressure is low.
13. Which of the following road surfaces freezes first?
Bridges
Open roads
Underpasses
Parkings
14. In your mirror, you see a car approaching from the rear. The next time you check your mirror, you don't see the car. If you wish to change lanes, you should:
wait until you are sure the car isn't in your blind spot.
assume the car left the roadway and change lanes as normal.
ease into the other lane slowly so the other car can get out of the way.
None of the above.
15. Who is responsible for inspecting the cargo?
The driver
The shipper
The person who loaded and secured the cargo
The motor carrier
16. Dollies with ABS are required to have a malfunction lamp:
on the front.
on the right side.
on the left side.
on the rear.
17. If the safety relief valve in the air brake system releases air:
this will supply more power to the drive wheels.
the valve is fully operational.
something is wrong.
this will supply more power to the brakes.
18. When you make a quick lane change, the crack-the-whip effect can turn the trailer over. The crack-the-whip effect is caused by:
rearward amplification.
worn tire tread.
strong wind.
the rear trailer of a triple.
19. Alcohol:
improves reaction time.
impairs depth perception.
does not affect judgement.
improves muscle coordination.
20. When coupling, you should:
be aware that wrong coupling and uncoupling can be very dangerous.
make sure the sliding fifth-wheel is locked.
make sure the trailer kingpin is bent.
make sure the trailer wheels are not chocked.
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