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DMV PRACTICE
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Massachusetts CDL Combination Test 2
Practice mode
Question
1
of 20
QUESTION 1 / 20
To prevent a rollover, a driver should:
Choose one answer below.
A
Keep cargo low.
✓
B
Place cargo high.
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C
Keep cargo loose.
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D
Turn quickly.
✓
QUESTION 2 / 20
An Anti-Lock Braking System (ABS):
Choose one answer below.
A
Allows wheels to lock up.
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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.
✓
QUESTION 3 / 20
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.
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QUESTION 4 / 20
When uncoupling a trailer, landing gear should be:
Choose one answer below.
A
Raised completely.
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B
Lowered halfway.
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C
Just off the pavement.
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D
Firmly on the ground.
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QUESTION 5 / 20
Using the trailer hand brake while experiencing a trailer jackknife will:
Choose one answer below.
A
Stop the skid.
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B
Straighten the trailer.
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C
Increase traction.
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D
Continue the skid.
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QUESTION 6 / 20
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 / 20
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 8 / 20
The easiest way to recognize that your trailer has begun to skid is to:
Choose one answer below.
A
Ask another driver.
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B
Use your mirrors to determine if the trailer has left the lane.
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C
Release the brake pedal and then push it down again.
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D
Watch the jackknife warning light on the control panel.
✓
QUESTION 9 / 20
If your trailer goes off course while you are backing, you should:
Choose one answer below.
A
Continue the backing process without changing anything.
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B
Pull the truck forward, readjust, and start backing again.
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C
Get out of the truck and move the trailer into the right position.
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D
Turn the steering wheel all the way to the left until the trailer straightens out.
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QUESTION 10 / 20
If you are operating a vehicle built before 1998 and are unsure if the trailer has an Anti-Lock Braking System (ABS), you can:
Choose one answer below.
A
Check for wheel speed sensors coming from the back of the brakes.
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B
Look for a red light on the front right corner of the converter dolly.
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C
Pump the air brakes to activate the ABS.
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D
Assume the vehicle has ABS.
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QUESTION 11 / 20
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 12 / 20
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 13 / 20
If a trailer begins to skid, the driver should:
Choose one answer below.
A
Lock the brakes.
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B
Release the brakes.
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C
Steer in the opposite direction.
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D
Accelerate.
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QUESTION 14 / 20
Combination vehicles:
Choose one answer below.
A
Are usually shorter than single commercial vehicles.
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B
Are usually lighter than single commercial vehicles.
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C
Require more skill to drive than single commercial vehicles.
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D
Are easier to drive than single commercial vehicles.
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QUESTION 15 / 20
Using the trailer hand valve while driving:
Choose one answer below.
A
Will help you turn safely.
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B
Will stop your trailer safely.
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C
Can cause a skid.
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D
Is impossible.
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QUESTION 16 / 20
What is a tractor protection valve?
Choose one answer below.
A
A valve to keep air in the brake system should there be a bad leak
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B
A valve that prevents the truck from being stolen
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C
A valve that prevents the driver from going too fast
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D
A valve that prevents the trailer from accidentally being released
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QUESTION 17 / 20
What does the trailer air supply control look like?
Choose one answer below.
A
It is a square blue knob.
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B
It is a triangular yellow knob.
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C
It is an eight-sided red knob.
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D
It is a circular orange knob.
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QUESTION 18 / 20
If a trailer begins to jackknife, you should not:
Choose one answer below.
A
Release the brakes.
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B
Apply the trailer hand brake.
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C
Allow the wheels to grip the road.
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D
Allow the trailer to straighten out.
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QUESTION 19 / 20
If colors are being used to distinguish glad hands, which color is used for emergency lines?
Choose one answer below.
A
Orange
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B
Yellow
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C
Blue
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D
Red
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QUESTION 20 / 20
Test the tractor protection valve by:
Choose one answer below.
A
Removing the air supply knob.
✓
B
Removing the parking brake control knob.
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C
Releasing air with the brake pedal.
✓
D
Releasing air with the gas pedal.
✓
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