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ID CDL General Knowledge Practice Questions - Idaho CDL General Knowledge Test Exam
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Question
1
of 25
QUESTION 1 / 25
When beginning a pre-trip inspection, what should an Idaho CDL applicant do first?
Choose one answer below.
A
Start the engine and drive forward to test acceleration
✓
B
Approach the vehicle and look for overall condition, damage, leaks, and leaning
✓
C
Check only the cargo doors before entering the cab
✓
D
Release the parking brake and listen for air leaks
✓
QUESTION 2 / 25
Which group of items belongs in an engine-compartment inspection?
Choose one answer below.
A
Oil, coolant, power steering fluid, belts, hoses, and leaks
✓
B
Only the windshield washer fluid and mirrors
✓
C
Only the fifth wheel and trailer doors
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D
Only tire tread depth and wheel seals
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QUESTION 3 / 25
What minimum tread depth is required on front steering-axle tires?
Choose one answer below.
A
2/32 inch
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B
4/32 inch
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C
1/32 inch
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D
No minimum if the tire is properly inflated
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QUESTION 4 / 25
What minimum tread depth is required on most non-steering axle tires?
Choose one answer below.
A
4/32 inch
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B
3/32 inch
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C
2/32 inch
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D
6/32 inch
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QUESTION 5 / 25
Which emergency equipment should a CMV carry for roadside emergencies?
Choose one answer below.
A
A CB radio, spare tire, and first-aid kit only
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B
A fire extinguisher, spare electrical fuses when needed, and warning devices such as three reflective triangles
✓
C
Only road flares because triangles are optional
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D
A tow chain and extra fuel can
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QUESTION 6 / 25
During a vehicle inspection, which lights should be checked?
Choose one answer below.
A
Only headlights
✓
B
Headlights, turn signals, brake lights, four-way flashers, clearance lights, and reflectors
✓
C
Only lights required at night
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D
Only trailer lights, because tractor lights are checked during service
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QUESTION 7 / 25
What does excessive brake pushrod travel usually indicate on an air-brake vehicle?
Choose one answer below.
A
The brakes may be out of adjustment
✓
B
The parking brake is stronger than normal
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C
The engine brake is working properly
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D
The steering axle is overloaded
✓
QUESTION 8 / 25
For an air-brake vehicle, why is the air pressure buildup test important?
Choose one answer below.
A
It confirms the compressor can restore pressure fast enough for safe braking
✓
B
It proves the fuel pump is working
✓
C
It measures tire inflation pressure
✓
D
It replaces the need to inspect brake drums
✓
QUESTION 9 / 25
What should a driver do with a defect that affects safe operation?
Choose one answer below.
A
Drive until the next scheduled maintenance interval
✓
B
Have it corrected before operating the vehicle
✓
C
Ignore it if the trip is short
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D
Report it only after cargo is delivered
✓
QUESTION 10 / 25
After starting a trip, when should cargo securement first be rechecked?
Choose one answer below.
A
Within the first 50 miles
✓
B
Only at the destination
✓
C
After 500 miles
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D
Only if the load is uncovered
✓
QUESTION 11 / 25
What is the safest general rule for backing a CMV?
Choose one answer below.
A
Back quickly to reduce time in traffic
✓
B
Avoid backing when possible and use a helper when available
✓
C
Open the door and back without mirrors
✓
D
Back only from the right side
✓
QUESTION 12 / 25
When backing and unsure of clearance, what should the driver do?
Choose one answer below.
A
Get out and look before continuing
✓
B
Sound the horn and keep backing
✓
C
Rely only on convex mirrors
✓
D
Ask another driver by radio without checking
✓
QUESTION 13 / 25
Why must a CMV driver allow extra room when turning?
Choose one answer below.
A
Large vehicles off-track, so rear wheels follow a shorter path than front wheels
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B
Large vehicles always turn sharper than cars
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C
Trailers move away from the curb during every turn
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D
The steering wheel locks during tight turns
✓
QUESTION 14 / 25
What is the correct approach to a right turn in a long vehicle?
Choose one answer below.
A
Swing wide left before turning so cars can pass on the right
✓
B
Turn slowly and keep the rear wheels from running over the curb while preventing vehicles from squeezing on the right
✓
C
Start from the left lane whenever possible
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D
Accelerate through the turn to reduce off-tracking
✓
QUESTION 15 / 25
Why should a driver avoid sudden steering movements in a CMV?
Choose one answer below.
A
They can cause cargo shift, skids, or rollover
✓
B
They improve traction on wet pavement
✓
C
They reduce stopping distance
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D
They make off-tracking disappear
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QUESTION 16 / 25
What is the best time to shift gears on a steep downgrade?
Choose one answer below.
A
Before starting down the grade
✓
B
Halfway down the grade
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C
Only after the brakes fade
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D
At the bottom of the hill
✓
QUESTION 17 / 25
What is double-clutching used for in many manual CMVs?
Choose one answer below.
A
Matching engine speed and road speed while shifting
✓
B
Charging the air tanks
✓
C
Testing the parking brake
✓
D
Increasing tire traction
✓
QUESTION 18 / 25
What should a CMV driver do before entering a curve?
Choose one answer below.
A
Slow to a safe speed before the curve
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B
Brake hard in the middle of the curve
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C
Accelerate because posted advisory speeds are for trucks
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D
Shift to neutral to coast through
✓
QUESTION 19 / 25
Why do CMVs need more following distance than passenger cars?
Choose one answer below.
A
They are heavier and usually require more distance to stop
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B
They have shorter stopping distances
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C
They are exempt from speed limits
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D
Their mirrors eliminate blind spots
✓
QUESTION 20 / 25
At highway speeds in good conditions, what following distance is a common CDL rule of thumb for a long CMV?
Choose one answer below.
A
At least 1 second
✓
B
At least 2 seconds
✓
C
At least 7 seconds or more depending on length and speed
✓
D
Exactly 20 seconds at all speeds
✓
QUESTION 21 / 25
Which factor increases total stopping distance?
Choose one answer below.
A
Higher speed
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B
Lower vehicle weight only
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C
Clean mirrors
✓
D
Using low-beam headlights
✓
QUESTION 22 / 25
What does it mean to drive at a speed that lets you stop within the distance you can see?
Choose one answer below.
A
You are not overdriving your headlights or sight distance
✓
B
You are using cruise control correctly
✓
C
You are maximizing fuel economy only
✓
D
You are following the vehicle ahead too closely
✓
QUESTION 23 / 25
When crossing or entering traffic, why does a CMV need a larger gap?
Choose one answer below.
A
It accelerates slowly and takes longer to clear the intersection
✓
B
It has automatic right of way
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C
It can stop faster than cars
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D
It may ignore cross traffic if using hazard lights
✓
QUESTION 24 / 25
What is brake fade?
Choose one answer below.
A
Reduced braking power caused by excessive brake heat
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B
A normal ABS warning light
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C
Improved braking after long use
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D
A steering-system defect
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QUESTION 25 / 25
What is snub braking on a downgrade?
Choose one answer below.
A
Applying brakes firmly to reduce speed by about 5 mph, then releasing until speed rises again
✓
B
Lightly riding the brakes all the way down
✓
C
Pumping the parking brake continuously
✓
D
Coasting in neutral to cool the engine
✓
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