IDAHO CDL COMBINATION PRACTICE TEST
11.
What are the two basic reasons for covering cargo?
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To protect people from spilled cargo and the cargo from pilferage.
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To protect the cargo from weather and to avoid littering.
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To protect people from spilled cargo and the cargo from weather.
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12.
Most hydraulic brake failures occur for one of two reasons, one of which is:
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loss of hydraulic pressure.
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excessive downshifting.
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relying too much on the engine braking effect.
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13.
Hydroplaning:
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only occurs at extremely high speeds.
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can occur at speeds as low as 30 mph.
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only happens when tire pressure is higher than normal.
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14.
If the safety relief valve in the air brake system releases air:
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something is wrong.
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this will supply more power to the brakes.
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the valve is fully operational.
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15.
After supplying air to the trailer brake system, you should check the brake system for crossed air lines by:
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shutting the engine off so you can hear the brakes.
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applying and releasing the trailer brakes and listening for the sound of trailer brakes.
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All of the above.
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16.
When looking at your cargo covers in the mirrors while driving, you must be aware that a flapping cover:
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can tear loose, uncovering the cargo.
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helps keep the cargo as close to the ground as possible.
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keeps the cargo cool.
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17.
If your vehicle is equipped with air brakes, loss of air pressure in the emergency line will cause:
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the vehicle to slide back and forth.
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the springs to put on the brakes.
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the trailer emergency brakes to come on.
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18.
Which of the following statements about off-tracking is true?
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If there is more than one trailer, the rear wheels of the last trailer will off-track the most.
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When a vehicle goes around a corner, the rear wheels follow the same path as the front wheels.
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Longer vehicles off-track less.
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19.
Before leaving your vehicle unattended, you should:
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Apply the parking brake.
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Remove the keys.
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All of the above.
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20.
Which of the following is NOT part of inspecting the coupling?
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Making sure there is no space between the upper and the lower fifth-wheel
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Checking that the locking lever is in the "lock" position
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Checking for enough clearance between the rear of the tractor frame and the landing gear.
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