LA CDL DOUBLES TRIPLES PRACTICE TEST
11.
Emergency brakes must be held on by:
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hydraulic pressure.
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dynamic pressure.
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mechanical force.
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air pressure.
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12.
The trolley valve should be used only:
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to test the trailer brakes.
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in driving.
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in an emergency.
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to prevent skids.
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13.
After an accident, an improper use of flares could cause:
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the vehicle to slide back and forth.
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a fire if spilled fuel is on the ground.
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air pressure to build from 50 to 100 psi within 2 minutes.
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the springs to put on the brakes.
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14.
When the wheels of a trailer lock up, which of the following is most likely to occur?
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The trailer will tend to swing around (trailer jackknife).
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The trailer will tend to push the towing vehicle sideways (tractor jackknife).
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The trailer will the trailer
has overturn.
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The rig will stay in a straight line but slide sideways.
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15.
Under a pressurized system, the radiator cap:
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should never be removed until the system has cooled.
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should never be hot.
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should be removed when the coolant is hot.
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should always be cool.
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16.
The trailer hand valve should:
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never be used for parking.
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be used in driving.
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never be used to test the trailer brakes.
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All of the above.
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17.
Because of the "crack-the-whip" effect, doubles and triples:
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are much slower than other combination vehicles.
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are more likely to turn over than other combination vehicles.
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are more likely to run out of gas than other combination vehicles.
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can go much faster than other combination vehicles.
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18.
If you cannot make a right turn without entering another traffic lane, you should:
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swing wide to the left before starting the turn.
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watch out for vehicles coming toward you and back up for them.
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turn wide before you start the turn.
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turn wide as you complete the turn.
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19.
If the drive wheels begin to spin, you should:
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apply your brakes all the way.
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take your foot off the accelerator.
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accelerate smoothly and change gears as necessary.
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wait 4-5 seconds before applying the accelerator.
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20.
When inspecting the coupling, how much space should there be between the upper and the lower fifth-wheel?
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It depends on the load
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None.
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½ inch
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It depends on the trailer
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