Download CDL Practice Test: 100 Questions & Answers for Exam Success and more Exams Commercial Law in PDF only on Docsity!
CDL PRACTICE TEST 100 QUESTIONS &
ANSWERS 100% CORRECT
1. A railroad crossing is ahead of you and you are hauling hazardous mate-
rial. When you stop for the crossing, you can stop as far away as feet from the nearest rail.: 50
2. Who is responsible for safely transporting a hazardous material shipment
without delay and keeping the shipping papers in the right place?: the driver
3. You find an overheated tire during an enroute inspection. If you are hauling
hazardous materials, you must ANS Remove the tire and place it a safe distance from the vehicle.
4. The intent of hazardous materials regulations is to ensure safety, to con-
tain the material, and ANS to communicate the risk
5. The total transport index of all radioactive material packages in a single
vehicle must not exceed .: 50
6. You are going to be hauling hazardous materials over a route you do not
know well. When should you check the route and get the permits needed for the trip ANS before starting the trip
7. Which three hazard classes should not be loaded into a trailer that has a
heater / air conditioner unit.: flammable liquids
flammable gas explosives
8. What is the only exception to certification by a shipper?: Correct When the
shipper is a private carrier of his own product.
9. A truck carrying explosives has crashed with another vehicle. You should
not pull them apart until.: correct The explosives have been placed at least 200 feet away from the vehicles and occupied buildings.
10. When handling packages of explosives, you must
ANS Correct Never use hooks or other metal tools
11. When driving with more than one trailer, which trailer should be the first
one behind the tractor?: correct Answer: The heaviest trailer
12. You are driving a 100 foot twin trailer combination at 50 mph. The road is
dry and the visibility is good.You should keep at least seconds of space ahead of you.: Correct Answer: 11
13. With the hand valve on, you should test the trailer brakes by opening
the service line valve at the rear of the rig. When you do this, you should hear ANS Correct Answer: Air escape from the open valve
22. When should you check your mirrors while making a lane change?: ...a.
After signaling the change b. Right after starting the lane change after completing lane change
23. Which of these statements about managing space to the sides is true?: -
...Correct Answer: You should avoid traveling next to others when possible
24. Which of these statements about handling of doubles and triples is true?:
...Correct Answer: A sudden movement with the steering wheel can result in a tipped over rear trailer
25. How can you be sure you supplied air to a second trailer?: ...Correct
Answer: Go to the rear of the second trailer and open the emergency line shut off
26. You should check the height of the trailer before connecting a converter
dolly to a second or third trailer. The trailer height is right when ANS ...a. The trailer will be raised slightly when the converter dolly is backed under it.
27. You want to hook your combination to a second trailer that has no spring
brakes. To do this without wheel chocks you should ANS ...Correct Answer: Sup- ply air to the trailer air system with the tractor and then disconnect the emergency line
28. Which of these will result in the best control on curves?: d. Slowing to a
safe speed before entering the curve, then accelerate slightly during the curve
29. Before you can supply air to the air tanks of a second trailer you need
to ANS c. Open the shut off valves at the rear of both trailers
30. You are coupling a tractor to a semi trailer and have backed up but are not
under it. What should you hook up before backing under?: Correct Answer: The emergency and service air lines.
31. You have coupled with a semi trailer. In what position should you put the
front trailer supports before driving away?: Correct Answer: Fully raised with the crank handle secured in its bracket.
32. Air lines on a combination vehicle are often colored to keep them from
getting mixed up. The emergency line is ; the service line is .: Cor- rect Answer: Red, blue
33. Which of these statements is true?: Correct Answer: "bobtail" tractors can
take longer to stop than a combination vehicle loaded to the maximum gross weight.
34. You are coupling a tractor and semi trailer and have connected the air
lines. Before backing under the trailer, you should
40. Before you back under a trailer, make sure the
ANS Correct Answer: Trailer brakes are locked.
41. If the service air line comes apart while you are driving a combination
vehicle but the emergency line stays together, what will happen right away?- : Correct Answer: Nothing is likely to happen until you try to apply the brakes
42. the air leakage rate for a combination vehicle (engine off, brakes on)
should not Be more than psi per minute.: Correct Answer: 4
43. In normal driving, some drivers use the hand valve before applying the
brake pedal to prevent a jackknife. Which of these statements is true?: Cor- rect Answer: It should not be done.
44. The driver crosses the air lines when hooking up to an old trailer. What
will happen?: Correct Answer: If the trailer has no spring brakes, you can drive away, but you will not have trailer brakes.
45. Why should you lock the tractor glad hands (or dummy couplers) to each
other when you are not towing a trailer?: Correct Answer: It will keep dirt and water out of the lines.
46. The safety catch for the fifth wheel locking lever must be for a
coupling to be complete.: Correct Answer: Over the locking lever
47. The front trailer supports are up and the trailer is resting on the tractor.
Make sure ANS Correct Answer: Trailer emergency brakes to come on.
48. When backing under a tractor under a trailer you should expect
ANS Correct Answer: Trailer will be lifted slightly when the tractor backs under it.
49. Of the choices below, the first thing to do when a low air pressure warning
comes on is ANS Your Answer: Stop and safely park as soon as possible.
50. The braking power of the spring brakes
ANS Your Answer: Depends on the adjustment of the service brakes.
51. The air compressor governor controls
ANS Correct Answer: When air is pumped into the air tanks.
52. The application pressure gauge shows the driver how much pressure
ANS -
Your Answer: Is being applied to the brakes.
53. You should not back a tractor under a trailer until the whole air system
is ANS Correct Answer: At normal pressure
ANS Go slowly around turns.
63. If your truck or bus has dual parking control valves it means that you can
use pressure from a separate tank to ANS Correct Answer: Release the spring brakes to move a short distance.
64. A straight truck or bus air brake system should not leak at a rate of more
than PSI per minute with the engine off and the brakes released.: Your Answer: 2
65. If your vehicle has an alcohol evaporator, it is there to
ANS Your Answer: Reduce the risk of ice in air brake valves in cold weather.
66. If you must make an emergency stop, you should brake so that you
ANS Your Answer: Use the hand brake first.
67. Your truck or bus has a dual air brake system. If a low air pressure warning
comes on for only one system, what should you do?: Your Answer: Stop. Safely park, and continue only after the system is fixed.
68. Which of the following makes the total stopping distance for air brakes
longer than that for hydraulic brakes.: Correct Answer: Brake lag distance.
69. The braking power of the spring brakes
ANS Your Answer: Depends on the adjustment balance
70. When driving down a long steep hill you should
ANS c. Release the brake when you are 5 M.P.H. below your
71. The brake system that applies and releases the brakes when the driver
uses the brake pedal is the ANS Correct Answer: Service brake system.
72. The most common type of foundation brakes found on heavy vehicles is
the ANS Correct Answer: S-cam drum
73. Vehicles with air brakes must have
ANS Correct Answer: An air pressure gauge to show the pressure available for braking.
74. The driver must be able to see a warning that is given before air pressure
in the service air tanks falls below ANS Correct Answer: 60 psi
75. The application pressure gauge shows the driver how much pressure
ANS -
Correct Answer: 3 psi in one minute
76. To make an emergency stop with air brakes, using the stab braking
83. Why drain water from the compressed air tanks?: Correct Answer: Water
can freeze in cold weather and cause brake failure.
84. Air brake equipped vehicles must have
ANS Correct Answer: A supply pressure gauge.
85. What can legally hold a parking or emergency brake in position for a
truck, truck tractor or bus?: Correct Answer: Spring pressure
86. Which of these statements about brakes is true.: Your Answer: The heavier a
vehicle or the faster it is moving, the more heat the brakes have to absorb to stop it.
87. What should you do when your vehicle hydroplanes?: Your Answer: Re-
lease the accelerator.
88. Which fires can you use water to put out?: Correct Answer: Tire fires.
89. Your vehicle is in a traffic emergency and may collide with another vehicle
if you do not take action. Which of these is a good rule to remember at such a time?: Your Answer: Heavy vehicles can almost always turn more quickly than they can stop.
90. Which of these is a sign of tire failure?: a. Steering that feels heavy.
b. Vibration. c. A loud bang.
91. Which of these statements about drinking alcohol is true?: Your Answer: A
few beers have the same effect on driving as a few shots of whisky.
92. Which of these can help you stay alert while driving?: Your Answer: Taking
short breaks before you are drowsy.
93. Which one of these is not part of the check of the engine compartment
done for a pre trip inspection?: Correct Answer: Valve clearance.
94. According to the driver's manual, why should you limit the use of your
horn?: Your Answer: It can startle other drivers.
95. You are traveling down a long, steep hill. Your brakes get so hot that they
fail. What should you do?: Your Answer: Look for an escape ramp or escape route.
96. How far should a driver look ahead of the vehicle while driving?: Your
Answer: 12-15 seconds
97. Which of these statements about cargo loading is true?: Your Answer:
State laws dictate legal weight limits.
