COMBINATION TEST MASSACHUSETTS - PRACTICE TEST
11.
The best way to recognize that your trailer has started to skid is:
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by hearing squeaking noises from the wheels.
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by seeing it in your mirrors.
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by using retarders.
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None of the above.
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12.
Why should you cover your cargo?
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To protect people from spilled cargo.
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Because spill protection is a safety requirement in many states.
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To protect the cargo from weather.
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All of the above.
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13.
The front trailer supports are up, and the trailer is resting on the tractor. Make sure:
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the electrical and air connections are properly connected between the tractor and the trailer.
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there is enough clearance between the rear of the tractor frame and the landing gear.
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there is enough clearance between the top of the tractor tires and the nose of the trailer.
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All of the above.
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14.
Most heavy trucks with manual transmissions require ____ to change gears.
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double clutching
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single clutching
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triple clutching
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None of the above.
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15.
If you are driving a 30 foot vehicle at 35 mph, you should leave at least _______ between your vehicle and the vehicle in front of you.
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1 seconds
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4 seconds
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3 seconds
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2 seconds
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16.
If are being followed closely, you should:
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increase your following distance.
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change lanes quickly.
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decrease your following distance.
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flash your brake lights.
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17.
The service line is also called:
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carrier line or control line.
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pressure line or signal line.
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control line or signal line.
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signal line or air line.
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18.
Which of the following is true about the trailer hand valve?
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It should be used only to test the trailer brakes.
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The trailer hand valve works the trailer brakes.
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If used in driving it could cause the trailer to skid.
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All of the above.
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19.
If your brakes get wet, it can cause them:
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to grab.
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to apply unevenly.
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to be weak.
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All of the above.
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20.
In combination vehicles with air brakes, the trailer air supply control:
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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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is used to keep the trailer behind the tractor.
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is used to control the tractor protection valve.
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supplies air to the trailer air tanks.
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