COMBINATION PRACTICE TEST - HI CDL
11.
When coupling a tractor to a semi-trailer, after checking if the fifth-wheel is in proper position for coupling you should:
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make sure the area around the vehicle is clear and the trailer wheels are chocked.
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connect the air lines to the trailer.
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connect the electrical cord and check the air lines.
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12.
A bridge formula permits:
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less maximum axle weight for axles that are close together.
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more maximum axle weight for axles that are closer together.
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less maximum axle weight for axles that are far apart.
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13.
An Anti-lock Braking System:
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increases the distamce required to stop on slippery surfaces.
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increases a vehicle's stopping power.
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keeps your wheels from locking when you brake hard.
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14.
Foundation brakes are used:
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at each wheel.
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only with the right wheels.
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only with the front wheels.
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15.
What is the proper following distance for a 40 foot truck traveling at 35 mph?
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4 seconds
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10 seconds
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12 seconds
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16.
If you let air out of hot tires:
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as the tire cools, the air pressure will be too low.
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the tires will cool off much sooner.
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air pressure will increases, causing the tires to blow out.
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17.
When inspecting the coupling, make sure the fifth-wheel jaws have closed around the:
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shank of the kingpin.
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head of the kingpin.
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the electrical cord.
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18.
When your vehicle goes around a corner, the rear wheels follow a different path than the front wheels. This is called:
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front-rear tracking.
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off-tracking.
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skidding.
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19.
When transporting cargo, cargo securement must be checked within the first _____ miles of a trip and every _____ miles after.
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50; 150
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50; 250
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100; 150
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20.
As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
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the service line valve close.
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a mechanical vibration.
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air escaping from the open valve.
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