DOUBLES TRIPLES TEST MN - CDL PRACTICE TEST
11.
When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
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if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
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The air could leak out of the trailer air tank, releasing its emergency brakes.
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You may not notice a major leak in the service line until you try to put the brakes on.
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None of the above.
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12.
You should flash your brake lights to warn drivers behind you when:
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you see you'll need to slow down.
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you see a hazard that will require slowing down.
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you see a bus stops in the roadway ahead to unload passengers.
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All of the above.
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13.
Dual tires:
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should always come in contact with each other.
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are dangerous.
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should come in contact with each other whenever possible.
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should not come in contact with each other.
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14.
If the safety relief valve in the air brake system releases air:
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the valve is fully operational.
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something is wrong.
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this will supply more power to the drive wheels.
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this will supply more power to the brakes.
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15.
Driving in very hot weather:
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can decrease oil pressure.
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can make it difficult to stay in your lane.
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can increase tire pressure.
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should never be done.
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16.
To prevent getting sleepy while driving, you should:
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close the vent.
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keep the cab warm.
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keep cool by opening the window.
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drive alone whenever possible.
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17.
When parked on the side of the road, you should:
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use the 4-way emergency flashers.
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activate the right turn signal.
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flash your brake lights.
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turn off all lights.
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18.
You can release dolly brakes:
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by closing the air tank petcock.
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by closing the emergency line valve.
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by opening the service line valve.
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by opening the air tank petcock.
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19.
If the drive wheels start to skid:
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use the brakes to slow down.
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accelerate slightly to regain control.
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push in the clutch to let them turn freely.
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All of the above.
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20.
You should NOT use the parking brakes if:
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the brakes are very hot.
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the brakes are too dry.
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the brakes are cold.
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All of the above.
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