True/False
Indicate whether the
statement is true or false.
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1.
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Clearance underneath a combination vehicle is not a problem when crossing a
railroad crossing.
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2.
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When backing a trailer, you turn the top of the steering wheel in the opposite
direction that you want the trailer to go.
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3.
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To help prevent a rollover, keep loaded cargo as close to the ground as you
can.
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4.
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Trailer hand valves should be used during normal vehicle operation in order to
slow or stop the vehicle.
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5.
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The trailer air supply control valve supplies air to the trailer air
tanks.
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6.
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Trailer air shut-off valves should always be in the open position on
trailers.
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7.
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Before backing under a trailer to couple it, always make sure the trailer brakes
are released.
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8.
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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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9.
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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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10.
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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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Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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11.
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When a tractor pulling a double trailer makes a quick lane change, what part of
the vehicle is more likely to turn over?
a. | The tractor. | b. | The front trailer. | c. | The rear
trailer. | d. | The entire combination vehicle |
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12.
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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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13.
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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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14.
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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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15.
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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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16.
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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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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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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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19.
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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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20.
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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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