OR CDL COMBINATION PRACTICE TEST
11.
Most hydraulic brake failures occur for one of two reasons, one of which is:
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excessive downshifting.
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loss of hydraulic pressure.
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relying too much on the engine braking effect.
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driving in cold weather.
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12.
If you discover a fire, before opening trailer doors you should:
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use the fire extinguisher on the doors.
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feel the doors to see if they are hot.
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have a helper open the doors.
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All of the above.
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13.
If your trailer starts to skid, you should:
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release the brakes.
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steer in the opposite direction.
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pump the brakes.
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lock the brakes.
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14.
The tire load rating is stated:
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on each axle.
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on the dashboard.
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inside the suspension system.
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on the side of each tire.
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15.
What is the minimum tread depth for tires other than front tires?
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4/32 inch
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8/32 inch
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4/16 inch
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2/32 inch
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16.
Emergency brakes must be must be held on by:
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mechanical force.
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air pressure.
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water.
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the locking mechanism.
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17.
When inspecting the coupling, make sure the fifth-wheel jaws have closed around the:
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the brake camshaft.
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head of the kingpin.
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shank of the kingpin.
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the electrical cord.
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18.
A bridge formula permits less maximum axle weight for axles that:
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are closer together
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have a high center of gravity
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are further apart than normal
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have poor weight balance
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19.
When checking air brakes on combination vehicles, which of the following is NOT part of checking that air flows to all trailers?
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Using the trailer handbrake to provide air to the service line.
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Pulling tractor forward until the fifth-wheel comes out from under the trailer.
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Opening the emergency line shut-off valve at the rear of the last trailer.
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Going to the rear of the rig.
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20.
If your vehicle gets stuck on the railroad tracks, you should:
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get out of your vehicle and away from the tracks.
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check for identifiable landmarks to give the location of the crossing.
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gather up your paperwork and shipping papers while calling 911, then get out of the vehicle.
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All of the above.
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