PENNSYLVANIA CDL COMBINATION PRACTICE TEST
11.
When the tractor protection valve closes, the trailer _______ brakes will come on.
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service
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emergency
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hand
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parking
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12.
You supply air to the trailer brake system by:
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pushing in the trailer air supply knob.
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pulling out the trailer air supply valve.
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connecting the tractor service air line to the trailer service glad hand.
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plugging the electrical cord into the trailer.
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13.
If you have convex mirrors, be aware that:
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everything appears smaller in a convex mirror than it would if you were looking at it directly.
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objects seem closer than they really are.
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in a convex mirror objects appears larger than they really are.
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objects may appear to be faster than they really are.
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14.
When backing a trailer on a curved path you should back towards:
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either side.
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neither side (back up straight).
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the passenger's side.
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the driver's side.
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15.
When the ______ closes, it stops any air from going out of the tractor.
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height control valve
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alcohol evaporator
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hand valve
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tractor protection valve
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16.
When driving a 50 foot combination vehicle at 50 mph in ideal conditions, you should keep at least ____ seconds of space in front of you.
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4
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6
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5
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10
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17.
When driving on slippery roads, you should NOT:
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go slowly.
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watch far enough ahead to keep a steady speed.
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try to anticipate stops early.
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use the engine brake.
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18.
The trailer hand valve should be used only:
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only in combination with the foot brake.
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when the trailer is fully loaded.
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to test the trailer brakes.
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in driving to prevent skids.
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19.
After supplying air to the trailer brake system, you should check the brake system for crossed air lines by:
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applying and releasing the trailer brakes and listening for the sound of trailer brakes.
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checking the air brake system pressure gauge for signs of major air loss.
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shutting the engine off so you can hear the brakes.
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All of the above.
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20.
What factors can cause brakes to fail or fade?
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Brakes out of adjustment
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Not relying on the engine braking effect
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Excessive use of the service brakes
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All of the above.
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