CDL general knowledge practice test 10

A: At the source or base of the fire. Keep your distance and spray at the base of the fire where it is burning, not into the flames above it. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.21.3 Fire fighting, page 93.

B: Cab ventilation may be poor, so carbon monoxide can build up. With windows rolled up, leaks can let carbon monoxide into the cab; it makes you sleepy and in large enough amounts can kill you. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.13.1 Vehicle checks, page 76.

B: In the opposite direction. Backing a trailer reverses the steering: turn the wheel the opposite way from where you want to go, then follow the trailer once it starts turning. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.2.4 Backing safely, page 44.

D: Electrical fires and burning liquids. The B:C type works on electrical fires and burning liquids; the A:B:C type also works on wood, paper and cloth. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.21.3 Fire fighting, page 93.

A: Carry the right number plus extra cross links, check them, and learn to put them on before you need to. Have enough chains plus spare cross links, make sure they fit the drive tires, check them for damage and practice putting them on before winter conditions force you to. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.13.1 Vehicle checks, page 76.

A: Turn the top of the steering wheel in the direction of the drift. As soon as the trailer drifts, steer the top of the wheel toward the side it is drifting to. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.2.4 Backing safely, page 44.

C: You could get shocked by an electrical fire, and water will spread a gasoline fire. Don't use water on an electrical fire (you could be shocked) or on a gasoline fire (it spreads the flames). Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.21.3 Fire fighting, page 93.

D: A lack of spray from other vehicles. If the vehicles around you have stopped throwing up spray, the wet surface has probably frozen. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.13.2 Driving, page 77.

D: Pulling forward to straighten and reposition the vehicle. Pulling forward as needed to straighten and reposition the vehicle while backing a trailer is called a pull-up. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.2.4 Backing safely, page 44.

B: To be cooled, which may take a lot of water. A burning tire must be cooled, and a lot of water may be required. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.21.3 Fire fighting, page 93.

C: Don't use it, because it can make the drive wheels skid. Leave the engine brake and retarder off on slippery roads, because they can make the drive wheels lose grip and skid. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.13.2 Driving, page 77.

C: Get Out And Look. G.O.A.L. stands for Get Out And Look, which you should do whenever you aren't sure what is behind you. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.2.4 Backing safely, page 44.

A: Upwind, so the wind carries the extinguishing agent to the fire. Position yourself upwind and let the wind carry the extinguisher to the fire. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.21.3 Fire fighting, page 93.

B: It becomes even more slippery. As the temperature rises to where ice begins to melt, the road becomes even more slippery, so slow down more. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.13.2 Driving, page 77.

B: Return to neutral, release the clutch, raise the engine speed to match the road speed and try again. Don't force it. Return to neutral, release the clutch, increase engine speed to match road speed and try again. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.3.1 Manual transmissions basic method for shifting up, page 45.

D: Not necessarily; keep going until whatever was burning has cooled. Continue until whatever was burning has cooled; no smoke or flame doesn't mean the fire can't restart. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.21.3 Fire fighting, page 93.

A: Weak or uneven braking, grabbing, wheel lockup, pulling to one side, or jackknifing. Water in the brakes can make them weak, apply unevenly or grab, causing lack of braking power, lockups, pulling and jackknifing if you pull a trailer. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.13.2 Driving, page 77.

A: Synchronized manual transmissions. Most heavy vehicles with unsynchronized manual transmissions need double clutching; with a synchronized manual transmission it is not required. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.3.1 Manual transmissions basic method for shifting up, page 44.

C: Class C. Class C fires are electrical equipment fires and must be put out with nonconducting agents such as carbon dioxide or dry chemicals, never water. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.21.3 Fire fighting, page 93.

D: Slow down, use a low gear, and keep light pressure on the brakes while crossing and for a short distance afterward. Slow down, shift to a low gear, gently apply the brakes and keep light pressure on them while crossing and for a short distance after to heat and dry them, then make a test stop. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.13.2 Driving, page 77.

D: Engine speed (RPM) and road speed (MPH). You can use engine speed on the tachometer or road speed on the speedometer; with either, you may learn to use engine sounds too. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.3.1 Manual transmissions basic method for shifting up, page 45.

B: Class B. Class B fires involve gasoline, oil, grease and other greasy liquids. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.21.3 Fire fighting, page 93.

C: Every 2 hours or 100 miles. In very hot weather, check the tires every 100 miles or every 2 hours. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.14.1 Vehicle checks, page 78.

C: The RPM at which you shift gets higher as you move up through the gears. Progressive shifting means each upshift happens at a higher RPM than the one before it. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.3.1 Manual transmissions basic method for shifting up, page 45.

B: Don't let air out; the pressure will be too low when the tires cool. Heat raises tire pressure. Letting air out of hot tires leaves them underinflated once they cool. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.14.1 Vehicle checks, page 78.