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Indiana CDL Combination Test 1
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Question
1
of 18
QUESTION 1 / 18
The trailer hand valve should be used:
Choose one answer below.
A
Regularly to activate the trailer brakes in all driving conditions.
✓
B
Only to test the trailer brakes.
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C
Only in inclement weather when the trailer may skid.
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D
Only if the trailer is carrying a load.
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QUESTION 2 / 18
When driving a bobtail tractor, you should be aware that:
Choose one answer below.
A
Bobtails stop very easily.
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B
Bobtails cannot drive as fast as tractors with semitrailers.
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C
Bobtails are more difficult to stop than tractors with semitrailers.
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D
Bobtails are illegal in most states.
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QUESTION 3 / 18
Which type of vehicle is most prone to the “crack-the-whip” effect?
Choose one answer below.
A
A five-axle tractor semi-trailer
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B
A three-axle tractor semi-trailer
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C
A bobtail tractor
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D
A triple trailer
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QUESTION 4 / 18
After finishing a pre-trip inspection, you should:
Choose one answer below.
A
Leave the rear shut-off valves open.
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B
Remove the service line valve.
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C
Close the emergency line valve.
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D
Leave the emergency line valve open.
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QUESTION 5 / 18
Emergency air lines are often coded with the color:
Choose one answer below.
A
Green.
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B
Orange.
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C
Yellow.
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D
Red.
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QUESTION 6 / 18
In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when:
Choose one answer below.
A
Air pressure drops to a level between 20 and 45 psi.
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B
You are experiencing a trailer jackknife.
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C
Wheels have regained traction after a skid.
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D
Air pressure is above 45 psi.
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QUESTION 7 / 18
Rollovers happen when drivers:
Choose one answer below.
A
Turn too quickly.
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B
Do not driving fast enough.
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C
Pay attention to the road.
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D
Drive illegally.
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QUESTION 8 / 18
Trailers with low underneath clearance may be difficult to drive:
Choose one answer below.
A
On interstate highways.
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B
Over railroad crossings.
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C
On dirt roads.
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D
At the posted speed limit.
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QUESTION 9 / 18
Test the tractor protection valve by:
Choose one answer below.
A
Removing the air supply knob.
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B
Removing the parking brake control knob.
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C
Releasing air with the brake pedal.
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D
Releasing air with the gas pedal.
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QUESTION 10 / 18
When lightly loaded, combination vehicles:
Choose one answer below.
A
Should not be driven.
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B
Have reduced braking capabilities.
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C
Will not rollover.
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D
Should be loaded with most of the weight in the rear of the trailer.
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QUESTION 11 / 18
The trailer hand valve should:
Choose one answer below.
A
Be used for parking.
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B
Be used only to test the trailer brakes.
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C
Be used together with the brake pedal.
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D
Be used on slippery surfaces.
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QUESTION 12 / 18
If your trailer begins to drift off course while you are backing, you should:
Choose one answer below.
A
Continue trying to back up without stopping.
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B
Turn the top of your steering wheel in the direction of the drift.
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C
Turn the top of the steering wheel in the direction opposite of the drift.
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D
Return the steering wheel to the 12 o’clock position.
✓
QUESTION 13 / 18
If oil and water build up in your vehicle's air tanks, the brakes:
Choose one answer below.
A
May not work correctly.
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B
May feel squishy.
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C
Will squeal loudly when used.
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D
Will be extremely sensitive.
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QUESTION 14 / 18
Large combination vehicles take the longest amount of time to stop:
Choose one answer below.
A
When fully loaded.
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B
When partially loaded.
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C
When empty.
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D
When mostly loaded.
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QUESTION 15 / 18
Simply changing lanes can cause:
Choose one answer below.
A
A “crack-the-whip” effect, resulting in a rollover.
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B
A trailer to straighten out.
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C
Confusion over which lane the driver is hoping to use.
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D
Other drivers to reduce their speed.
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QUESTION 16 / 18
While inspecting a coupling, you should go under the trailer and:
Choose one answer below.
A
Detach the jaws from around the kingpin.
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B
Make sure the locking lever is in the "emergency" position.
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C
Remove the safety latch.
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D
Look into the back of the fifth wheel.
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QUESTION 17 / 18
How many air lines does a combination vehicle have?
Choose one answer below.
A
One
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B
Two
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C
Three
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D
Four
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QUESTION 18 / 18
Before backing your tractor under the trailer, make sure your trailer brakes are:
Choose one answer below.
A
Disengaged.
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B
Locked.
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C
Deactivated.
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D
Dry.
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