True/False
Indicate whether the
statement is true or false.
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1.
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When coupling a tractor to a trailer, trailer air lines should only be connected
AFTER backing under the trailer.
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2.
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Trailers with antilock brake systems (ABS) will have a yellow ABS malfunction
lamp on the side of the trailer.
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3.
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When coupling a tractor to a trailer, if the trailer is too high, it may not
couple correctly.
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4.
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After coupling a tractor to a trailer, you are visually checking the coupling of
the combination unit. Everything is OK because there is a 1/2 inch gap between the tractor
fifth wheel plate and the trailer plate.
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5.
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Always visually check the coupling of a combination unit.
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6.
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After coupling a tractor to a trailer, the front trailer supports should be
raised half way with the crank handle.
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7.
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After coupling a tractor to a semitrailer, the tractor tires should be touching
the nose of the trailer.
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8.
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The following is the procedure to test the tractor protection valve after
coupling:
1. Charge the air brake system by building normal pressure and push in the
“air supply” knob
2. Shut the engine off.
3. Step on and off the brake
pedal to reduce air pressure in the tanks.
4. See if the tractor protection valve control
“pops out”.
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9.
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To test the trailer emergency brakes with a charged air system, you pull out the
tractor protection valve control and gently pull on the trailer with the tractor to make sure the
trailer emergency brakes come on.
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Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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10.
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The fifth wheel locking lever in not locked after the jaws of the fifth wheel
close around the kingpin. This means that:
a. | The kingpin is in a safe position to drive. | b. | You can still set
the fifth wheel for weight and balance. | c. | You are ready to adjust the height of the fifth
wheel. | d. | The coupling is not right and should be fixed before driving the coupled
unit. |
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11.
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Before you back under a trailer, make sure the:
a. | Air pressure is at zero. | b. | Trailer brakes are locked. | c. | Tractor protection
valve is normal. | d. | Air brakes are turned off. |
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12.
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When you are preparing to back under a semitrailer, you should line up the
tractor:
a. | About 15 degrees off the line of the trailer. | b. | So the kingpin hits
the driver’s side locking jaw. | c. | Directly in front of the
trailer. | d. | So one landing gear is lined up with fifth wheel. |
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13.
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You are coupling a trailer to your tractor. You are about to back under
the trailer. The trailer is at the right height when:
a. | The end of the kingpin is even with the top of the fifth wheel. | b. | The kingpin is about
2 inches above the fifth wheel. | c. | The trailer will be raised slightly when the
tractor is backed under it. | d. | The fifth wheel is low enough that it does not
touch the bottom of the trailer. |
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14.
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You are coupling a tractor to a semitrailer. You have backed up but are
not yet under the trailer. What should you hook up before backing under the trailer?
a. | Nothing; back up and then lock the fifth wheel. | b. | The electrical
service cable. | c. | The fifth wheel lock. | d. | The emergency and service air
lines. |
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15.
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You should not back a tractor under a trailer until the air system
is:
a. | Empty. | b. | Bled down to half the maximum
pressure. | c. | At normal pressure. | d. | Between 30 and 50
psi. |
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16.
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You have just coupled a tractor to a trailer. After you supply air to the
trailer, make sure the air lines are not crossed and the trailer brakes are working. This is
done by:
a. | Turning on the parking brakes from the cab. | b. | Applying and
releasing the trailer brakes and listening for brake sounds. | c. | Emptying the trailer
air tanks. | d. | Taking your foot off of the brake pedal. |
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17.
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You are coupling a tractor and a semitrailer, and have connected the air
lines. Before backing under the trailer you should:
a. | Apply the brakes so others are alerted by the sounds. | b. | Supply air to the
trailer system, then pull out the air supply knob to lock the trailer brakes. | c. | Make sure the
trailer brakes are off. | d. | Empty the trailer air
tanks. |
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18.
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After coupling a tractor to a trailer, how should you test to make sure the
fifth wheel and kingpin connection is secure?
a. | Rock the trailer back and forth with the trailer brakes locked. | b. | Put the tractor in
gear and pull forward quickly. | c. | Lock the trailer brakes and gently pull forward
in low gear. | d. | None of the above. |
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19.
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How much space should be between the lower fifth wheel and the upper trailer
plate after coupling?
a. | Varies by trailer. | b. | At least 1/2 inch. | c. | Just enough to see a
crack. | d. | None. |
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20.
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You have coupled a tractor to a semitrailer. Where should you put the
trailer supports before driving away?
a. | Raise the trailer supports just until they rise off the ground. | b. | Raise the trailer
supports 1/2 way up and remove the crank handle. | c. | Raise the trailer supports fully, and secure
the crank handle it its bracket. | d. | Raise the trailer supports 3 full turns and
secure the crank handle in its bracket. |
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21.
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Which of the following is true?
a. | After coupling, the landing gear and its supports must be touching the tractor
frame. | b. | After coupling, the tractor tires must be touching the nose of the
trailer. | c. | Both a and b are true. | d. | Neither a or b is
true. |
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22.
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You have a major leak in the service line and you put on the brakes.
Service air pressure will escape and cause:
a. | The trailer emergency brakes to come on. | b. | The trailer air tank
pressure to be lost. | c. | The tractor spring brakes to
lock. | d. | None of the above. |
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23.
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To correct a drive-wheel braking skid, you should:
a. | Stop braking, turn quickly, and countersteer. | b. | Increase
braking. | c. | Increase braking, turn quickly, and countersteer. | d. | Accelerate. |
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