COMBINATION TEST NEVADA - PRACTICE TEST
11.
When driving in very hot weather, the heat will increase the chances of:
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suspension system defects.
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tire failure.
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loss of hydraulic pressure.
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ABS malfunction.
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12.
In combination vehicles with air brakes, the trailer air supply control should pop out when the air pressure falls within the range of:
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10 to 20 psi
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20 to 45 psi
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50 to 75 psi
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100 to 120 psi
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13.
Older trailers do not have spring brakes. If the air supply leaks away:
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the ABS won't work properly.
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the trailer will stop normally.
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there will be no emergency brakes.
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All of the above.
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14.
The only way to stop a front-wheel skid is to:
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supply more power to the drive wheels.
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countersteer.
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let the vehicle slow down.
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All of the above.
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15.
You have uncoupled a trailer and want to inspect the landing gear. The tractor should be positioned:
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with the tractor frame above the trailer.
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completely clear of the trailer.
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with the tractor frame under the trailer.
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None of the above.
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16.
At passive railroad crossings, even if there are active railroad signals that indicate the tracks are clear, you must _________ to be sure it is safe to proceed.
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go, stop and listen
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stop, look, and listen
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listen, look and stop
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go, look and put the transmission in neutral
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17.
To unlock the fifth wheel, pull the release handle to the _______ position.
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open
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closed
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neutral
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sixth
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18.
A high center of gravity means:
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you'll have better traction.
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the spring brakes will come fully on.
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you are more likely to tip over.
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a rollover is less likely.
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19.
To secure the tractor you should:
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Put on the parking brake and put the transmission in neutral.
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Connect the tractor service air-line to the trailer service glad hand.
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Check that the kingpin and the fifth-wheel are aligned.
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All of the above.
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20.
You are checking the tractor-trailer connection to make sure it is safe and secure. The landing gear should be:
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fully raised.
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fully lowered.
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raised slightly off the ground.
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None of the above.
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