CDL DOUBLES TRIPLES PRACTICE TEST MASSACHUSETTS
11.
You must have at least 4/32 inch tread depth in every major groove on front tires and at least ___ inch on other tires.
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3/32
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4/32
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2/32
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1/32
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12.
A red triangle with an orange center means:
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Slow-moving vehicle
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Law enforcement vehicle
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The vehicle is hauling hazardous materials
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Liquid tanker
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13.
Which of the following statements is true?
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Carrying a properly charged and rated fire extinguisher will help prevent fires.
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Under-inflated tires will NOT cause a vehicle fire.
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Poor cargo ventilation is a common cause of fire.
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There is no way that short circuits due to damaged insulation can cause a vehicle fire.
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14.
If you unlock the pintle hook with the dolly still under the rear trailer:
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your vehicle might roll away.
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steam and boiling water can spray under pressure.
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the dolly tow bar may fly up.
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the brakes could be damaged by the combined forces of the springs and the air pressure.
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15.
Air brakes use ________ to make the brakes work.
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compressed air
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compressed gas cylinders
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compressed gases
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compressed oil
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16.
Many large vehicles have convex (curved, "spot, "fisheye") mirrors. Convex mirrors:
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misrepresent reality by showing a larger area than flat mirrors.
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are illegal in most states.
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make things look smaller and farther away than they really are.
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None of the above.
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17.
When approaching a double railroad track, you should:
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expect to hear a train when it's approaching.
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rely upon the presence of warning signals.
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remember that a train on one track may hide a train on the other track.
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remember that trains may be more frequent.
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18.
How far ahead do most good drivers look?
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3 to 4 seconds
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6 to 8 seconds
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12 to 15 seconds
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50 to 60 seconds
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19.
Hanging meat in a refrigerated truck:
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should never be transported.
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will not affect safe driving ability.
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creates a low center of gravity.
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can be a very unstable load.
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20.
If there is a cargo fire in a van or box trailer, you should:
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keep the doors shut.
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open the doors, especially if your cargo contains hazardous materials.
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enlist the help of bystanders.
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keep driving until you reach help.
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