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District Of Columbia CDL Class B Knowledge Test 2
Practice mode
Question
1
of 25
QUESTION 1 / 25
Which of the following statements is correct?
Choose one answer below.
A
Rims with a missing lug nut are acceptable if there are at least four other lug nuts on the rim.
✓
B
A cracked lock ring is acceptable if the vehicle is being driven at speeds under 55 mph.
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C
A missing clamp is dangerous and should be corrected.
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D
Welded repairs are acceptable for wheels on rear axles.
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QUESTION 2 / 25
Convex mirrors:
Choose one answer below.
A
Cannot be used on vehicles transporting hazardous materials.
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B
Can replace flat mirrors.
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C
Can be helpful to see a wider area.
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D
Are illegal to be used in most states.
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QUESTION 3 / 25
In a vehicle with dual parking control valves, once air pressure is lost and the spring brakes come on:
Choose one answer below.
A
You will be unable to move the vehicle.
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B
A separate air tank can be used to release the spring brakes for a short period of time.
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C
You can use the spring brakes to continue driving normally.
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D
The air tanks will automatically refill to a safe air pressure level.
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QUESTION 4 / 25
Your vehicle's final position should be:
Choose one answer below.
A
Exactly where the examiner has instructed it to be.
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B
Within five feet of the final position described by the examiner.
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C
Wherever you can safely park.
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D
Within two feet of the final position described by the examiner.
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QUESTION 5 / 25
Cargo inside a trailer:
Choose one answer below.
A
Does not need to be secured.
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B
Should be stacked no taller than three feet high.
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C
Should be secured to prevent movement in transit.
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D
Should be loaded with the heaviest items on top of lighter items.
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QUESTION 6 / 25
If you’re feeling tired before a drive, you should:
Choose one answer below.
A
Drink coffee.
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B
Take caffeine pills.
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C
Not drive.
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D
Drive as fast as possible so you get to the destination quickly.
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QUESTION 7 / 25
Most heavy vehicles require ____ to change gears.
Choose one answer below.
A
Double clutching
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B
Double shifting
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C
Triple clutching
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D
Triple shifting
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QUESTION 8 / 25
After an accident, flares should be used with caution because:
Choose one answer below.
A
There may be spilled fuel on the ground that could ignite.
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B
Other drivers may not see the flares.
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C
Flares are expensive.
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D
Other drivers may get confused about what is happening.
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QUESTION 9 / 25
When steering to avoid a crash, you should:
Choose one answer below.
A
Only use one hand to steer.
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B
Keep both hands on the steering wheel.
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C
Not use your mirrors to check other lanes.
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D
Speed up as you get nearer to the hazard.
✓
QUESTION 10 / 25
Why do you need to drain air tanks regularly?
Choose one answer below.
A
Because the air gets old and needs to be replaced
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B
Because compressed air contains some water which must be drained from the tanks
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C
To allow for a change in air pressure
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D
To remove bad air from the tanks
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QUESTION 11 / 25
You should always use at least ____ to secure cargo on a flatbed trailer.
Choose one answer below.
A
One tie-down
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B
Two tie-downs
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C
Three tie-downs
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D
Four tie-downs
✓
QUESTION 12 / 25
What is a wig wag?
Choose one answer below.
A
A type of warning system
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B
A tube used to move air from the compressor to the tanks
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C
A noise made by air brakes when used
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D
A part within the braking unit that allows air to move freely
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QUESTION 13 / 25
Which of the following is not an example of a driver who might be a hazard?
Choose one answer below.
A
A driver operating a vehicle without first scraping ice off the windshield
✓
B
The operator of a rental truck
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C
The driver of a station wagon with items covering the back windows
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D
A person operating a pick-up truck
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QUESTION 14 / 25
During the vehicle inspection test, you will be required to do all of the following, except:
Choose one answer below.
A
Walk around the vehicle.
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B
Point to or touch each item.
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C
Explain what you are checking and why.
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D
Crawl under the vehicle.
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QUESTION 15 / 25
If transporting livestock, drivers should be concerned about:
Choose one answer below.
A
Other motorists seeing the livestock.
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B
The vehicle's weight shifting as the animals move.
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C
Extra tolls.
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D
Passing emissions testing.
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QUESTION 16 / 25
When inspecting the engine compartment, you should not:
Choose one answer below.
A
Check the engine oil level.
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B
Check the coolant level in the radiator.
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C
Drain the brake fluid.
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D
Check the windshield washer fluid level.
✓
QUESTION 17 / 25
A serious traffic violation involves each of the following offenses, except:
Choose one answer below.
A
Excessive speeding.
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B
Littering.
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C
Reckless driving.
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D
Following too closely.
✓
QUESTION 18 / 25
When driving on the expressway during the skills test, you should:
Choose one answer below.
A
Switch lanes frequently.
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B
Use your mirrors to check traffic as needed.
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C
Drive on the left side of the lane.
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D
Drive above the posted speed limit.
✓
QUESTION 19 / 25
When inspecting cargo, the driver should do all of the following, except:
Choose one answer below.
A
Ensure that the truck is not overloaded.
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B
Ensure that the cargo is balanced.
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C
Ensure that the cargo is secured properly.
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D
Ensure that the breakable items are placed under heavier items.
✓
QUESTION 20 / 25
Stopping distance can be affected by:
Choose one answer below.
A
Speed.
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B
Sunshine.
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C
Time of day.
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D
Traffic.
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QUESTION 21 / 25
How is water and compressor oil removed from the bottom of an air storage tank?
Choose one answer below.
A
The water and oil are siphoned out of the tank.
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B
A drain valve is opened to remove the water and oil from the tank.
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C
The water and oil are removed automatically as the brakes are used.
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D
A sponge is used to soak up the water and oil.
✓
QUESTION 22 / 25
Bridges usually:
Choose one answer below.
A
Freeze, but only once the temperature drops significantly below 32 degrees Fahrenheit.
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B
Freeze after other road surfaces freeze.
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C
Freeze before other road surfaces.
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D
Have heaters to prevent them from freezing.
✓
QUESTION 23 / 25
If exiting a bus during the basic vehicle control skills test, you must:
Choose one answer below.
A
Keep both hands on the handrail.
✓
B
Not touch the handrail.
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C
Maintain a firm grasp on the handrail.
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D
Rush down the stairs.
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QUESTION 24 / 25
Cargo on flatbed trailers should be:
Choose one answer below.
A
Tied down.
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B
Glued down.
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C
Left loose.
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D
Pushed to one side.
✓
QUESTION 25 / 25
Without oil in its engine:
Choose one answer below.
A
A vehicle will likely run smoothly.
✓
B
A vehicle will make quick jerks while driving.
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C
A vehicle's engine may be damaged quickly.
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D
A vehicle's gas mileage will improve.
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