Kentucky CDL Practice Test

Not quite. The answer is 3

Your truck's emergency equipment must include warning devices such as three reflective red triangles, three liquid burning flares, or six fusees.

Not quite. The answer is 70

Under the Hours of Service 70-Hour Rule, you must not be on duty longer than 70 hours in an 8-day period. That's an average of about 8.75 on-duty hours per day. Learn how to budget your time so you can work a reasonable number of hours each day. Note that "on duty" includes all work time, both driving and not driving (such as when conducting pre-trip inspections).

Not quite. The answer is You should never remove the radiator cap on a pressurized system until the system has cooled.

Never remove the radiator cap if the engine is overheated. Steam and boiling water could shoot out under high pressure and injure you. Wait until you can touch the radiator cap with your bare hand without it feeling excessively hot. Some vehicles have coolant overflow tanks or sight glasses that let you check the coolant level without removing the radiator cap.

Not quite. The answer is Both of the above

Leaking shock absorbers and broken or missing leaves are two of the more common defects that may occur in a suspension system.

Not quite. The answer is Main spring

Component R is a main leaf spring. Component U is an auxiliary leaf spring (sometimes called a helper spring), attached to the axle with the same U-bolt. Auxiliary springs are often employed in rear suspensions that have to support heavy loads.

Not quite. The answer is Alcohol first affects judgment and self-control.

Alcohol first affects a driver's judgment and self-control, and then it affects coordination, vision, and muscle control. These are all essential driving skills. Impairment of these skills significantly increases the chance of an accident. Your liver burns alcohol at a set rate. There is nothing you can do to increase that rate.

Not quite. The answer is 150 miles

A short-haul driver is exempt from the Hours of Service regulations, if he or she meets all the following requirements: (1) the driver operates within a 150-mile radius of the driver's home terminal or yard; (2) the driver goes off duty within 14 consecutive hours of work; (3) each 14 hours on duty is followed by at least 10 off-duty hours for a truck driver or 8 off-duty hours for a bus driver; and (4) the driver's employer keeps accurate records of the driver's duty status for the next six months.

Source: 49 CFR 395.1

Not quite. The answer is 10 – 15 degrees Fahrenheit.

Diesel #2 (2-D) fuel is the most common type of fuel for large commercial diesel-powered vehicles. This type of fuel contains paraffin. When the ambient temperature drops to around 14 degrees Fahrenheit, the paraffin starts to form visible crystals, making the fuel appear cloudy. The vehicle may still be drivable. However, if the temperature continues to drop further, the paraffin may gel to the point that it clogs the fuel filter. At this point, the vehicle won't start at all, or engine performance will be impaired. To prevent gelling, you can add an anti-gel additive to the fuel, switch to a winter blend of fuel that is less likely to gel at these temperatures, or use a fuel warmer or fuel line heater.

Not quite. The answer is not turn any more than necessary to clear what is in your way.

To avoid a crash or other hazard, keep both hands on the steering wheel so you can turn as quickly as possible. However, turn just enough to avoid the hazard. A too-sharp turn risks a skid or rollover. While turning quickly, avoid braking; this too could cause a skid.

Not quite. The answer is body weight.

Your blood alcohol concentration (BAC) is affected by how much alcohol you drink, how quickly you drink it, and how much you weigh. The larger your body, the larger the volume through which the alcohol has to spread.

Not quite. The answer is The trailer can push the tractor sideways.

The most common type of skid by far is the drive-wheel skid. Drive-wheel acceleration skids can occur on slippery roads. Drive-wheel braking skids occur when braking causes the drive wheels to lock. Because locked wheels have less traction than rolling wheels, the rear wheels usually slide sideways in an attempt to "catch up" with the front wheels. With combination vehicles, a drive-wheel skid can let the trailer push the tractor sideways, causing a sudden jackknife.

Not quite. The answer is Many heavy vehicle accidents occur between midnight and 6 a.m.

Truck accidents are more likely to occur in the mid-afternoon or between midnight and 6 a.m., times when drivers are naturally drowsy.

Not quite. The answer is driving too fast for road conditions.

Always adjust your speed to fit current driving conditions including weather, visibility, tire traction, curves, and hills. In practice, this will sometimes mean driving at well below the posted speed limit.

Not quite. The answer is No.

It is not enough for the engine not to be overheated. The cooling system must cool completely before you attempt to remove the radiator cap. Even then, you should be very careful because there may still be tremendous pressure and damaging steam and fluids.

Not quite. The answer is 1

The Commercial Vehicle Safety Alliance (CVSA) developed the National Roadside Inspection Program, which defines eight different levels of inspections, each with its own list of items to be inspected. Level 1 is the most comprehensive. Both the driver and the vehicle are checked. The inspector checks the vehicle by a walkaround inspection and by getting physically underneath the vehicle to check for defects there. Level 2 is similar to Level 1, except the inspector doesn't get underneath the vehicle. Only a walkaround inspection is performed on the vehicle.

Not quite. The answer is Much more than under normal driving conditions

Wet roads can double your stopping distance. Slow down and greatly increase your usual following distance.

Not quite. The answer is you can see better, watching the vehicle's rear out the side window.

You should always back toward the driver's side because you will be able to see things much more easily. For example, you can keep an eye on the vehicle's rear by viewing it out your side window. If your truck pulls in either direction, it needs service. Your neck's comfort should not affect your safety decision.

Not quite. The answer is both of the above.

Wet brakes can be weak, apply unevenly, or grab. This can cause loss of braking power, wheel lockups, pulling to one side or the other, and even a jackknife if you pull a trailer.

Not quite. The answer is To shift into a low gear when you're stopped

When driving a CMV with an unsynchronized manual transmission, you can shift gears by double clutching or floating the gears. To shift into low gear or reverse when your vehicle is stopped and the engine is idling, you can engage the clutch brake. This stops the transmission's input shaft (connected to the engine) from rotating, so you can smoothly shift into low gear or reverse. To engage the clutch brake, depress the clutch pedal all the way to the floor. Never engage the clutch brake while your vehicle is moving; doing so can damage the clutch brake.

Not quite. The answer is Passenger side

Large CMVs have large blind spots, called "No-Zones," on all four sides. For a tractor-trailer or semi-truck, the front No-Zone extends up to 20 feet in front of the truck, and the rear No-Zone extends up to 200 feet behind the trailer. The driver's-side No-Zone extends from the driver's door, back to just past the front of the trailer. The passenger-side No-Zone is the largest No-Zone, and also the most dangerous. It can extend up to three lanes wide.