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IN CDL Combination Practice Questions - Indiana CDL Combination Vehicles Test Exam
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Question
1
of 25
QUESTION 1 / 25
Indiana lists which CDL knowledge exam for drivers who plan to operate a combination of vehicles?
Choose one answer below.
A
Combination vehicle exam
✓
B
Passenger transport exam
✓
C
Tanker exam
✓
D
Doubles/triples exam only
✓
QUESTION 2 / 25
Which vehicle setup is a combination vehicle?
Choose one answer below.
A
Straight truck with no trailer
✓
B
Single bus with no trailer
✓
C
Cargo van under 10,000 pounds
✓
D
Truck tractor pulling a semi-trailer
✓
QUESTION 3 / 25
Under FMCSA Class A standards, the towed unit in a qualifying combination generally has a GVWR or GVW of more than:
Choose one answer below.
A
5,000 pounds
✓
B
8,000 pounds
✓
C
10,000 pounds
✓
D
15,000 pounds
✓
QUESTION 4 / 25
What manual section is the primary study source for Combination Vehicles topics in the Indiana CDL Manual?
Choose one answer below.
A
Section 2 only
✓
B
Section 6
✓
C
Section 4 only
✓
D
Section 9 only
✓
QUESTION 5 / 25
What is off-tracking in a combination vehicle?
Choose one answer below.
A
The trailer wheels follow a tighter path than the tractor during a turn
✓
B
The tractor brakes stop working on a grade
✓
C
The fifth wheel slides forward during travel
✓
D
The trailer ABS lamp stays on
✓
QUESTION 6 / 25
Why should a combination vehicle driver steer gently?
Choose one answer below.
A
To keep the air compressor cooler
✓
B
To make the fifth wheel unlock faster
✓
C
To avoid charging the trailer reservoirs
✓
D
To reduce crack-the-whip and rollover risk
✓
QUESTION 7 / 25
Where should cargo be placed to reduce rollover risk in a combination vehicle?
Choose one answer below.
A
As high as possible
✓
B
Only at the rear doors
✓
C
Low and centered
✓
D
Only over the landing gear
✓
QUESTION 8 / 25
Which action best prevents rollover on ramps and curves?
Choose one answer below.
A
Brake hard in the curve
✓
B
Drive slowly before entering the curve
✓
C
Use only the trailer hand valve
✓
D
Shift to neutral before turning
✓
QUESTION 9 / 25
Why do empty or lightly loaded trailers often skid easily?
Choose one answer below.
A
They have less tire traction for the available brake force
✓
B
They have no brakes
✓
C
They have no suspension
✓
D
They cannot use ABS
✓
QUESTION 10 / 25
If a trailer starts to skid because its wheels locked during braking, what should you do first?
Choose one answer below.
A
Apply only the trailer hand valve
✓
B
Accelerate hard
✓
C
Set the parking brakes
✓
D
Release the brakes so the wheels can roll
✓
QUESTION 11 / 25
What is a jackknife?
Choose one answer below.
A
The landing gear collapses while parked
✓
B
The fifth wheel slides to its rear stop
✓
C
The tractor and trailer fold toward each other at the coupling
✓
D
The trailer electrical cord disconnects
✓
QUESTION 12 / 25
When backing a combination vehicle, what should you do before entering a tight area?
Choose one answer below.
A
Turn off all lights
✓
B
Get out and check the path
✓
C
Use only the right mirror
✓
D
Set the trailer brakes while moving
✓
QUESTION 13 / 25
When backing, how often should you use both outside mirrors?
Choose one answer below.
A
Frequently throughout the maneuver
✓
B
Only at the start
✓
C
Only when the trailer is straight
✓
D
Only if a spotter is absent
✓
QUESTION 14 / 25
What does the fifth wheel lock around when a tractor-semi-trailer is properly coupled?
Choose one answer below.
A
The landing gear leg
✓
B
The trailer bumper
✓
C
The electrical cord
✓
D
The kingpin shank
✓
QUESTION 15 / 25
What should there be between the upper and lower fifth wheel after coupling?
Choose one answer below.
A
A visible open gap
✓
B
A loose chain only
✓
C
No visible space
✓
D
A block of wood
✓
QUESTION 16 / 25
Which line is the trailer emergency or supply line commonly associated with?
Choose one answer below.
A
Blue glad hand
✓
B
Red glad hand
✓
C
Green ABS lamp
✓
D
Yellow parking knob only
✓
QUESTION 17 / 25
Which line carries brake pedal service applications to the trailer service brakes?
Choose one answer below.
A
Service line
✓
B
Emergency supply line
✓
C
Battery ground cable
✓
D
Landing gear crank
✓
QUESTION 18 / 25
What is the trailer air supply control normally used to do before moving a coupled combination?
Choose one answer below.
A
Lower the landing gear
✓
B
Unlock the kingpin
✓
C
Turn off the trailer ABS
✓
D
Supply air to the trailer system
✓
QUESTION 19 / 25
What is the trailer hand valve mainly used for in CDL manual combination context?
Choose one answer below.
A
Parking overnight
✓
B
Normal braking on every stop
✓
C
Testing trailer brakes
✓
D
Unlocking the fifth wheel
✓
QUESTION 20 / 25
Why should you not use the trailer hand valve for parking?
Choose one answer below.
A
It locks the kingpin permanently
✓
B
It may leak off and release the brakes
✓
C
It disconnects the electrical cord
✓
D
It lowers the landing gear
✓
QUESTION 21 / 25
What should be checked on trailer air and electric lines during inspection?
Choose one answer below.
A
They are properly connected, secured, leak-free, and have enough slack for turns
✓
B
They are damaged to show age
✓
C
They are wrapped around the landing gear
✓
D
They are disconnected before every turn
✓
QUESTION 22 / 25
During a walk-around, what should you verify about the landing gear before driving?
Choose one answer below.
A
Partly lowered for stability
✓
B
Removed from the trailer
✓
C
Touching the road lightly
✓
D
Fully raised and secured
✓
QUESTION 23 / 25
What is the purpose of a tug test after coupling?
Choose one answer below.
A
To check engine horsepower
✓
B
To drain trailer air tanks
✓
C
To verify the fifth wheel is locked to the kingpin
✓
D
To test low-beam headlights
✓
QUESTION 24 / 25
After coupling, why must you visually inspect the fifth wheel?
Choose one answer below.
A
The manual requires painting the jaws
✓
B
A tug test alone does not prove the jaws are correctly around the kingpin shank
✓
C
The kingpin must be removed
✓
D
The trailer brakes must be disconnected
✓
QUESTION 25 / 25
What should you do with trailer wheels before coupling if the trailer might move?
Choose one answer below.
A
Chock them or make sure trailer spring brakes are holding
✓
B
Release all brakes
✓
C
Move them with a forklift
✓
D
Lift them with the fifth wheel
✓
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