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Pennsylvania CDL Combination Test 2
Practice mode
Question
1
of 19
QUESTION 1 / 19
A loss of air pressure in the emergency line will cause:
Choose one answer below.
A
The suspension springs to extend.
✓
B
The tractor protection valve to open.
✓
C
The rear trailer to detach from the combination.
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D
The emergency brakes to activate.
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QUESTION 2 / 19
An Anti-Lock Braking System (ABS):
Choose one answer below.
A
Allows wheels to lock up.
✓
B
Prevents wheels from locking up.
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C
Makes it easier to turn a large vehicle.
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D
Assists with the operation of brake lights.
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QUESTION 3 / 19
When coupling a trailer:
Choose one answer below.
A
Make sure to couple matching glad hands.
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B
Any glad hand can be connected to any other glad hand.
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C
It is best to leave one glad hand unattached.
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D
Only one set of glad hands should be connected.
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QUESTION 4 / 19
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 5 / 19
Failure to keep the fifth wheel plate properly greased could:
Choose one answer below.
A
Cause the trailer to disconnect.
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B
Cause steering problems.
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C
Cause braking problems.
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D
Affect the lights.
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QUESTION 6 / 19
Fully-loaded rigs:
Choose one answer below.
A
Are less likely to roll over than empty rigs.
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B
Are more likely to roll over than empty rigs.
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C
Are just as likely to roll over as empty rigs.
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D
Should not be driven.
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QUESTION 7 / 19
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 8 / 19
To test the trailer service brakes, you should:
Choose one answer below.
A
Move the vehicle forward slowly and apply the brakes with the brake pedal.
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B
Reverse the vehicle slowly and apply the brakes with the hand control.
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C
Reverse the vehicle slowly and apply the brakes with the brake pedal.
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D
Move the vehicle forward slowly and apply the brakes with the hand control.
✓
QUESTION 9 / 19
The best way to recognize that your trailer has begun to skid is by:
Choose one answer below.
A
Seeing other drivers' faces.
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B
Seeing it in your mirrors.
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C
Feeling it.
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D
Listening to the radio.
✓
QUESTION 10 / 19
Compared to other commercial motor vehicles, combination vehicles need more space on the road because they are longer and they:
Choose one answer below.
A
Need more space to turn and stop.
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B
Drive more slowly.
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C
Are twice the width.
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D
Swerve more often.
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QUESTION 11 / 19
Rollovers happen when:
Choose one answer below.
A
A truck driver is driving too fast.
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B
The driver of a vehicle in front of a truck is moving to slowly.
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C
A truck driver is driving too slowly.
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D
ABS is working effectively.
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QUESTION 12 / 19
One function of the emergency air line is to:
Choose one answer below.
A
Control the emergency brakes.
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B
Flash when air pressure is below a certain psi.
✓
C
Allow for quick turning.
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D
Control the ability to maneuver during bad weather conditions.
✓
QUESTION 13 / 19
The trailer hand valve:
Choose one answer below.
A
Should always be used for parking.
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B
Should only be used for parking on a downhill.
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C
Should never be used for parking.
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D
Should only be used when transporting cargo.
✓
QUESTION 14 / 19
Trailers manufactured after ____ must be equipped with Anti-Lock Braking Systems (ABS).
Choose one answer below.
A
1943
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B
1998
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C
2009
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D
2015
✓
QUESTION 15 / 19
When a combination vehicle goes around a corner:
Choose one answer below.
A
The turn should be made as tightly as possible.
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B
The front and rear wheels move in different paths.
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C
The rear wheels should run over the curb.
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D
It is acceptable for street signs to be knocked over if they are too close to the road.
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QUESTION 16 / 19
When backing a trailer, how should you turn the steering wheel?
Choose one answer below.
A
Turn the top of the steering wheel in the direction you want the trailer to go.
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B
Turn the top of the steering wheel in the direction opposite of where you want the trailer to go.
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C
It doesn’t matter.
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D
It depends on where the trailer is being backed.
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QUESTION 17 / 19
When connecting a converter dolly to a second or third trailer, the trailer height should be:
Choose one answer below.
A
Slightly higher than the center of the fifth wheel.
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B
Level with the center of the fifth wheel.
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C
Slightly lower than the center of the fifth wheel.
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D
Next to the center of the fifth wheel.
✓
QUESTION 18 / 19
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 19 / 19
A shut-off valve:
Choose one answer below.
A
Is located on the front of a trailer.
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B
Is located on the instrument panel.
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C
Prevents air from escaping an air brake system.
✓
D
Should always be open.
✓
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