True/False
Indicate whether the
statement is true or false.
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1.
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Never use the trailer hand valve as a parking brake.
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2.
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The trailer air supply control valve supplies air to the trailer air
tanks.
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3.
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The service air line runs between the tractor and trailer and is controlled by
the foot brake.
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4.
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The emergency air line supplies air to the trailer air tanks and controls the
emergency brakes on the trailer.
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5.
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Many trailers made before 1975 do not have spring brakes.
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6.
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It is not necessary to use wheel chocks when you
park trailers without spring brakes.
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7.
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Trailer air shut-off valves should always be in the open position on
trailers.
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8.
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If the emergency air line on a combination vehicle comes off or breaks apart, it
will cause the trailer emergency brakes to come on.
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9.
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When a service air line breaks or comes off, generally nothing happens until the
brakes are applied.
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10.
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Before backing under a trailer to couple it, always make sure the trailer brakes
are released.
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Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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11.
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You supply air to the trailer air tanks by:
a. | Pulling out the trailer air supply valve. | b. | Pushing in the
trailer air supply valve. | c. | Connecting the service line glad
hands. | d. | None of the above. |
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12.
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Air lines on a combination vehicle are usually color-coded to keep them from
being mixed up and connected incorrectly. The emergency line is _____________ and the service
line is ______________.
a. | Black; Yellow. | b. | Red; Green. | c. | Red;
Blue. | d. | Blue; Red. |
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13.
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Why should you lock the tractor air line glad hands to each other (or to
“dead end” or “dummy” couplers) when you are not pulling a
trailer?
a. | So that air pressure will build up on the tractor. | b. | It will keep dirt
and water out of the air lines. | c. | It provides a back up air
tank. | d. | To prevent tractor air leaks. |
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14.
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A driver crosses the air lines on an old trailer that does not have
spring brakes, what will happen?
a. | The hand valve will apply the tractor brakes instead of the trailer
brakes. | b. | You could pull the trailer but you would not have any trailer
brakes. | c. | Your will have no brakes at all. | d. | The brake pedal will work only the trailer
brakes. |
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15.
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You are driving a combination vehicle and your emergency air line breaks or gets
pulled apart. What will the loss of air pressure cause:
a. | The emergency trailer brakes will come on. | b. | The tractor
protection valve will close. | c. | The trailer supply valve will
open. | d. | Both a and b. |
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16.
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You are driving a combination vehicle and the service air line comes apart, but
the emergency air line stays connected. What will happen right away?
a. | The emergency tractor brakes will come on immediately. | b. | The trailer’s
air tank will immediately empty through the open line. | c. | Nothing is likely to happen until you try to
apply the brakes. | d. | The emergency trailer brakes will come on
immediately. |
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17.
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What is a fifth wheel?
a. | A spare tractor tire. | b. | Wheel number 5 on an 18
wheeler. | c. | A coupling plate that provides a connection between a
truck tractor and the semi-trailer it is towing. | d. | Another name for the
steering wheel on a truck. |
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18.
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Why should a fifth wheel plate be greased?
a. | To make sure the air does not leak out. | b. | To ensure a good
electrical connection. | c. | To prevent steering
problems. | d. | To reduce heat in the wheels. |
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19.
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The safety catch for the fifth wheel locking lever (or locking handle) must be
______ for a coupling to be complete.
a. | Over the locking lever. | b. | Under the locking lever. | c. | Through the locking
lever. | d. | Disconnected from the locking lever. |
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20.
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Which part of the kingpin should the locking jaws of the fifth wheel close
around?
a. | The shank. | b. | The head. | c. | The
base. | d. | The lip. |
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