E
.
Learndmv
DMV PRACTICE
Toggle navigation
Find your state
Exam types
Practice tests
Sign in
Create account
↗
← Leave quiz
Massachusetts CDL Combination Test 1
Practice mode
Question
1
of 20
QUESTION 1 / 20
If a trailer begins to jackknife, you should not:
Choose one answer below.
A
Release the brakes.
✓
B
Apply the trailer hand brake.
✓
C
Allow the wheels to grip the road.
✓
D
Allow the trailer to straighten out.
✓
QUESTION 2 / 20
Simply changing lanes can cause:
Choose one answer below.
A
A “crack-the-whip” effect, resulting in a rollover.
✓
B
A trailer to straighten out.
✓
C
Confusion over which lane the driver is hoping to use.
✓
D
Other drivers to reduce their speed.
✓
QUESTION 3 / 20
How many air lines does a combination vehicle have?
Choose one answer below.
A
One
✓
B
Two
✓
C
Three
✓
D
Four
✓
QUESTION 4 / 20
A lightly-loaded combination vehicle will stop more slowly than a fully-loaded vehicle because:
Choose one answer below.
A
The stiff suspension springs and strong brakes will have high traction.
✓
B
The stiff suspension springs and strong brakes will have low traction.
✓
C
The brakes only operate when a trailer reaches a minimum weight.
✓
D
The suspension springs only operate when a trailer reaches a minimum weight.
✓
QUESTION 5 / 20
Driving a combination vehicle ____ than driving a single vehicle.
Choose one answer below.
A
Is easier
✓
B
Requires more driving skill
✓
C
Is better for training
✓
D
Is safer in inclement weather
✓
QUESTION 6 / 20
To help prevent a rollover, cargo should be:
Choose one answer below.
A
Placed as high as possible inside the trailer.
✓
B
Placed as low as possible inside the trailer.
✓
C
Placed on the passenger side of the trailer.
✓
D
Placed on the driver’s side of the trailer.
✓
QUESTION 7 / 20
Trailers with low underneath clearance may be difficult to drive:
Choose one answer below.
A
On interstate highways.
✓
B
Over railroad crossings.
✓
C
On dirt roads.
✓
D
At the posted speed limit.
✓
QUESTION 8 / 20
If a load is placed on one side of a trailer, the trailer:
Choose one answer below.
A
May lean, and could result in a rollover.
✓
B
May add extra support during turns.
✓
C
Have improved braking.
✓
D
Have improved steering.
✓
QUESTION 9 / 20
When lightly loaded, combination vehicles:
Choose one answer below.
A
Should not be driven.
✓
B
Have reduced braking capabilities.
✓
C
Will not rollover.
✓
D
Should be loaded with most of the weight in the rear of the trailer.
✓
QUESTION 10 / 20
A tractor protection valve is:
Choose one answer below.
A
A device that keeps air in the tractor or truck brake system, should the trailer break away or develop a bad leak.
✓
B
A device that prevents theft.
✓
C
A device that controls fuel levels.
✓
D
A device that allows the battery to recharge efficiently.
✓
QUESTION 11 / 20
Failure to keep the fifth wheel plate properly greased could:
Choose one answer below.
A
Cause the trailer to disconnect.
✓
B
Cause steering problems.
✓
C
Cause braking problems.
✓
D
Affect the lights.
✓
QUESTION 12 / 20
When a combination vehicle goes around a corner:
Choose one answer below.
A
The turn should be made as tightly as possible.
✓
B
The front and rear wheels move in different paths.
✓
C
The rear wheels should run over the curb.
✓
D
It is acceptable for street signs to be knocked over if they are too close to the road.
✓
QUESTION 13 / 20
What does the trailer air supply control look like?
Choose one answer below.
A
It is a square blue knob.
✓
B
It is a triangular yellow knob.
✓
C
It is an eight-sided red knob.
✓
D
It is a circular orange knob.
✓
QUESTION 14 / 20
What is a bobtail?
Choose one answer below.
A
A tractor without a semi-trailer
✓
B
A tractor with two semi-trailers
✓
C
A tractor that goes faster than the speed limit
✓
D
A tractor that goes slower than the speed limit
✓
QUESTION 15 / 20
To lower the risk of a rollover, you should:
Choose one answer below.
A
Load the cargo as far forward as possible.
✓
B
Load the cargo as far back as possible.
✓
C
Load the cargo as low as possible.
✓
D
Stack the cargo as high as possible.
✓
QUESTION 16 / 20
When the wheels of a trailer lock up:
Choose one answer below.
A
The trailer will stay straight.
✓
B
The trailer tends to swing around.
✓
C
The cab will swing, but the trailer will stay straight.
✓
D
They will likely go flat.
✓
QUESTION 17 / 20
Fully-loaded rigs:
Choose one answer below.
A
Are less likely to roll over than empty rigs.
✓
B
Are more likely to roll over than empty rigs.
✓
C
Are just as likely to roll over as empty rigs.
✓
D
Should not be driven.
✓
QUESTION 18 / 20
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.
✓
B
Turn the top of the steering wheel in the direction opposite of where you want the trailer to go.
✓
C
It doesn’t matter.
✓
D
It depends on where the trailer is being backed.
✓
QUESTION 19 / 20
The emergency air line:
Choose one answer below.
A
Is controlled by the foot brake.
✓
B
Is connected to the relay valves.
✓
C
Supplies air to the trailer air tanks.
✓
D
Prevents skids.
✓
QUESTION 20 / 20
After coupling, there should be ____ between the upper and lower fifth wheel.
Choose one answer below.
A
No space
✓
B
Very little space
✓
C
A lot of space
✓
D
Three inches of space
✓
← Previous
0 of 20 answered
Next question →
Finish & see results →