SD CDL COMBINATION PRACTICE TEST
11.
When checking your tires during a pre-trip inspection, which of the following is acceptable?
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Tires made by different manufacturers
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Cracks in the tires
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Mismatched sizes
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Dual tires that come in contact with parts of the vehicle
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12.
In combination vehicles with air brakes, the trailer air supply control:
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is used to control the tractor protection valve.
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is a coupling devices used to connect the service and emergency air-lines from the tractor to the trailer.
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supplies air to the trailer air tanks.
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is used to keep the trailer behind the tractor.
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13.
Before starting down a hill, you should:
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release the accelerator and shift to Neutral at the same time.
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look for an escape route.
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apply the brakes hard.
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slow down and shift to a lower gear.
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14.
If you must stop on a one-way or divided highway, you should place warning devices _______ toward the approaching traffic.
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3, 15 and 45 feet
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5, 25 and 50 feet
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5, 50 and 500 feet
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10, 100 and 200 feet
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15.
Under a pressurized system, the radiator cap:
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should be removed when the coolant is hot.
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should always be cool.
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should never be hot.
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should never be removed until the system has cooled.
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16.
Which of the following is NOT part of testing the tractor protection valve?
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Shutting off the engine.
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Charging the trailer air brake system.
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Pulling forward slowly, then applying the trailer brakes.
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Stepping on and off the brake pedal several times to reduce the air pressure in the tanks.
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17.
Blocking and bracing are:
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used to keep cargo from sliding and to prevent movement of cargo.
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driving techniques used to regain control when your drive wheels start to skid.
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coupling devices used to connect the service air lines from the truck or tractor to the trailer.
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None of the above.
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18.
To secure the tractor you should:
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Put on the parking brake and put the transmission in neutral.
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Check that the kingpin and the fifth-wheel are aligned.
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Connect the tractor service air-line to the trailer service glad hand.
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All of the above.
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19.
When transporting cargo, the cargo should be checked:
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before the trip and after the first 50 miles.
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before the trip and after the first 150 miles.
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only before the trip.
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only after the trip.
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20.
If the ABS is not working:
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you still have normal brake functions.
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the vehicle will have weak brakes.
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the vehicle will have no brakes.
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None of the above.
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