CDL COMBINATION PRACTICE TEST (DC)
11.
If the drive wheels begin to spin when accelerating, you should:
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brake gently.
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take your foot off the accelerator.
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set the parking brake.
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continue to accelerate.
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12.
The heavier the vehicle:
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the less work the brakes must do to stop it.
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the higher the center of gravity will be.
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the more work the brakes must do to stop it.
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None of the above.
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13.
You are driving a heavy vehicle with a manual transmission, and you have to stop on the shoulder while driving on an uphill grade. When putting your vehicle back in motion up the grade, you should:
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shift down to a speed that you can control without using the brakes.
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keep the clutch slipping while slowly accelerating.
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partly engage the clutch before you take your right foot off the brake.
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use the parking brake to hold the vehicle until the clutch engages.
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14.
Banked curves:
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can be taken at any speed.
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have a safe "design speed".
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should always be avoided.
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are reserved for pedestrians.
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15.
If your vehicle is equipped with air brakes, loss of air pressure in the
emergency line causes:
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the trailer spring brakes to come on.
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the trailer emergency brakes to come on.
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the speed of your vehicle to increase.
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All of the above.
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16.
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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checking the air brake system pressure gauge for signs of major air loss.
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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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17.
When should you use the hand valve to park a combination vehicle?
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When parking downhill.
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Always.
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Never.
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To park at loading docks.
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18.
Glad hands are:
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securement devices.
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coupling devices.
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warning devices.
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electronic devices.
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19.
The emergency air line does NOT:
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control the emergency brakes on combination vehicles.
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cause the tractor protection valve to close when the emergency line loses pressure.
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pump air into the relay valves, allowing the trailer brakes to be applied more quickly.
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supply air to the trailer air tanks.
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20.
You should test the coupling by:
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applying the parking brakes so the rig will not move.
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locking the pintle hook.
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disconnect the safety chains.
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pulling against the pin of the second semitrailer.
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