1 . To prevent a rollover, cargo should be:

Loaded with most weight on the driver’s side of the trailer.
Placed near the rear of the trailer.
Spread out in the trailer.
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2 . While driving, gauges are:

Unreliable.
Unpredictable.
To be monitored for potential signs of trouble.
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3 . After an accident, flares should be used with caution because:

There may be fuel spilled on the ground that could catch fire.
Other drivers may not see the flares if the weather is sunny.
Flares are expensive.
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4 . Mirror adjustment can only be checked properly if:

The trailer is straight.
There is no trailer.
The vehicle is on a slight incline.
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5 . You are especially likely to encounter strong winds when:

Coming out of tunnels.
Going into tunnels.
Driving on shoulders.
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6 . Using the brakes creates heat. If too much heat is produced:

The brakes may not work.
The brakes may squeak more than usual.
The brakes will brake unevenly.
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7 . ABS brakes:

Help you avoid wheel lockup.
Lock up your vehicle's wheels.
Prevent your vehicle from accelerating when going uphill.
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8 . When the wheels of a trailer lock up:

The trailer will be drivable.
The trailer may swing around.
The vehicle will maintain steering.
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9 . When entering a curve, you should:

Shift into neutral.
Use the shoulder.
Downshift.
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10 . What is the Johnson bar?

A hand valve that works the trailer brakes
A valve that indicates the fuel level
A valve that limits the amount of cargo
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11 . Most heavy trucks with manual transmissions require ____ to change gears.

Single clutching
Double clutching
Triple clutching
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12 . The trailer hand valve should not be used while you are driving because:

It will disconnect from the vehicle.
You will stop the vehicle too quickly.
It can cause a skid.
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13 . A low air pressure warning signal should activate:

When tank pressure falls below 120 psi.
When tank pressure falls below 60 psi.
When tank pressure falls below 10 psi.
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14 . When coming to a stop, you should apply the brake pedal by:

Pushing down gradually.
Pushing down quickly.
Pulling up gradually.
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15 . If you are backing and the trailer begins to drift off-course, the driver should:

Return the steering wheel to the 12 o’clock position.
Turn the top of the steering wheel in the direction of the drift.
Turn the top of the steering wheel in the direction opposite of the drift.
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16 . If a truck is equipped, a trailer brake hand valve can be used to:

Add fuel to the truck.
Prevent the truck from rolling back when being started from a stop.
Check the engine oil level.
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17 . The tractor protection valve:

Ensures that oil adequately lubricates the engine.
Protects the tractor from exceeding a set speed.
Keeps air in the truck braking system if the trailer develops a leak.
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18 . Before a trip, you should make sure:

The front shut-off valve is closed.
The air in the braking system flows to all tires.
There is no air in the emergency air line.
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19 . When should the trailer hand valve be used?

Only when the trailer is carrying a load
Only to test the trailer’s brakes
Only in inclement weather when the trailer may skid
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20 . The minimum acceptable tread depth for rear tires is:

1/64 of an inch.
1/32 of an inch.
2/32 of an inch.
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