CDL DOUBLES PRACTICE TEST PENNSYLVANIA
11.
When checking the lights before driving:
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the engine must be running.
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make sure the parking brake is not set.
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you should turn off the engine.
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you should check them from inside the vehicle.
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12.
Hydroplaning:
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can occur only if there is a lot of water on the road.
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can occur at speeds as low as 30 mph.
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is less likely if tire pressure is low.
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can occur at speeds as low as 10 mph, if there is a lot of water.
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13.
When coupling double trailers, you can secure the second trailer by:
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setting the trailer emergency brakes.
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using the trailer spring brakes.
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chocking the wheels.
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All of the above.
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14.
When the trailer breaks away or develops a bad leak, the tractor protection valve will close automatically and:
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the trailer emergency brakes will come on.
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the engine will shut down.
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the trailer supply valve will stay open.
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the tractor will lose all 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 gases
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compressed gas cylinders
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compressed oil
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16.
In vehicles with air brakes, the two markings on a front brake limiting valve are:
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high and low.
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normal and slippery.
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left and right.
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wet and dry.
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17.
You should always try to back toward the driver's side because:
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backing toward the left side is more dangerous.
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you can watch the rear of your vehicle out the side window.
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you can more easily correct any steering errors.
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None of the above.
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18.
If driving a heavy vehicle, you should:
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stay in the right lane.
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try to pass other vehicles going uphill.
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stay in the left lane.
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avoid braking.
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19.
If you are carrying a heavy load that is slowing you down, you should:
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drive in the left lane.
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drive in the right lane.
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drive on the shoulder.
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keep the vehicle in third gear.
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20.
In vehicles with air brakes, the air compressor governor:
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controls how much air the air compressor will pump into the air storage tanks.
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controls when the air compressor will pump air into the air storage tanks.
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controls when the air storage tanks will pump air into the air compressor.
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None of the above.
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