COMBINATION PRACTICE TEST - IL CDL
11.
To avoid rollbacks when you start, you should:
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release the parking brake only when you have applied enough engine power.
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if you have manual transmission, partly engage the clutch before you take your right foot off the brake.
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put on the parking brake whenever necessary.
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All of the above.
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12.
Your vehicle has hydraulic brakes. When you press the brake pedal while driving and the pedal goes to the floor, remember that:
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shifting into neutral may help slow the vehicle.
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the parking brake should never used to slow the vehicle.
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pumping the brake pedal may generate enough hydraulic pressure to stop the vehicle.
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All of the above.
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13.
When backing a trailer, if you turn the wheel left:
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the cab will go left and the trailer will go right.
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the cab and the trailer will go left.
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the cab and the trailer will go right.
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the cab will go right and the trailer will go left.
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14.
Do not use the trailer hand valve in driving because:
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of the danger of making the trailer skid.
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the trailer emergency brakes will come on.
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the brakes can overheat and lose their braking power.
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All of the above.
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15.
You should always try to back toward the driver's side because:
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you can watch the rear of your vehicle out the side window.
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you can more easily correct any steering errors.
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backing toward the left side is more dangerous.
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None of the above.
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16.
Empty trucks require _____ stopping distances because empty vehicles have ______ traction.
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greater; more
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less; less
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greater; less
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less; more
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17.
Whenever you back up with a trailer, position your vehicle so you can back in a straight line. If you must back on a curved path, back toward:
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Neither side (do not back).
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the right side.
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Either side.
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the driver's side.
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18.
To prevent a rollover, you should keep the cargo as close to the ground as possible and:
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keep the vents clear so they work correctly.
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keep an eye on your tires.
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make sure that the release arm is in the engaged position.
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go slowly around turns.
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19.
The iron trailer supports are up, and the full weight of the trailer is resting on the tractor. Make sure:
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there is enough clearance between the upper and lower fifth wheel.
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there is enough clearance between the rear of the tractor frame and the landing gear.
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the safety latch is not engaged.
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you are in a low enough gear.
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20.
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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Going to the rear of the rig.
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Opening the emergency line shut-off valve at the rear of the last trailer.
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Pulling tractor forward until the fifth-wheel comes out from under the trailer.
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Using the trailer handbrake to provide air to the service line.
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